It would be highly inspirational, if you leave your valuable suggestions here.Thank You.

156 Responses to “Feedback”

  1. Deepak Jaison Says:

    Hey nice site guys…..
    and good interaction..
    senthil uses the net??? interesting…lol
    anyy all the best..
    when u make the chair make sure…you make a chair which has a seating capacity of 100 kgs..
    i want to test drive it..
    Deepak Jaison,
    E8B, Dept. Of Electronics,
    MEC Ernakulam

  2. Sreekanth C.K Says:

    Hi..Went to the web site…. Will u be able to adjust the heght of the wheel chair ?? Thats bcoz if u design ur chair for a person of 5.5 feet …a person of 6 feet may not be comfortable….And besides..if u can increase the height by 1 m …its kind of like the person feels like he is standin up wen in a crowd……Mebbe i am bein over ambitious …but think abt it ….And ya..”Ur site is very good!!

  3. Raghu Says:

    hi nisha and team..
    great work…the site looks very nice….so pls don’t spend more time to further beautify it…and… this way of communication has a big advantage…nobody in your team can sit idle….!
    all the best
    .
    Reghu Nath M.D.
    JTO(Computer Cell),BSNL, Ernakulam

  4. Sai Kumar Banala Says:

    Dear Friends,
    This is the Suggestion from Mr.SaiKumar Banala,Dept.of Mechanical Engineering, Uni. Of Delaware,USA[He is currently doing phd in Medical Robotics after graduating from Uni.of Delaware. BTech from IIT Guwahati]

    Hay,
    Looks cool and awesome, let me know once you finish the project. Looks like you guys are doing very well ….
    I cant suggest anything for voice-activation part ! but we can discuss in the driving mechanism / motor selection in detail.
    Well, what I would suggest is to make the wheel-chair differentially driven vehicle, with a motors attached to each wheel through timing-belt (easy and fast).
    Chain drive and gears are OK, but they tend to have some backlash.

    Timing belt
    If the motor can be mounted inline with hub, its perfect. So you need to have gearbox on the motor. Motors are generally available with matching gear-boxes, with gear-box, motor looks like a bit bigger than actual –size, but with low speed and large torque. You have to choose how much reduction you need.
    Motors
    Size of gear-box is usually same as the size of motor. It just gets longer. Diameters of gear-box is usually same as the diameter of motor. Hub motors are for comparatively high speed, like for riding bicycle, its costly too. I really don’t recommend hub-motors
    hub-motors are useful where there is space-constraint !like bicycles. You can use normal DC motors with gear head mount them inline with wheel axis, then you don’t even have to worry about any driving mechanism. Normal DC motor with gear head as one unit mount it on the wheel chair, connect the output shaft on gearbox to the axis of the wheel with a simple coupler.
    So DC Brushless motors with gearbox would be easier. Timing-belts are used a lot in mopeds, motor-cycles and even in cars. It should be available cheaply in India- try in any car/motor-cycle repair shop. Well, you can always reduce speed by feeding low current assuming torque won’t reduce!! But you should apply rated voltage with low current using PWM
    .

    Flexible couplers:
    They should be cheaply available in India. If it doesn’t work due to space limitations, you can mount the motor and gearbox behind the wheelchair, and then use timing-belt
    if timing belt cannot be obtained, then chain-drive can be used !
    Finally, if you still have time, you can use mechanical clutch, to disconnect the motor, so that in case of battery failure, the person can use his hands to drive the wheel chair.
    Carry on ..Good Luck..
    Sai K. Banala,
    Dept. of Mechanical Engg.
    Univ. of Delaware,
    USA

  5. Sayi P S Says:

    This looks a great start for your project. Do add more data related to design and implementation into it.

    All the best.
    Sayi P S
    IT Analyst
    Tata Consultancy Services(TCS)
    Chennai

  6. Ann Mary Noble Says:

    Kudos to you all!!! A great project indeed. Truly inspirational. Keep up the systematic work. Wishing everyone in the team the best…
    Ann
    E4,Dept of Electronics
    MEC, Ernakulam

  7. Mayank Murarka Says:

    Hi Guys,

    Looks like you have a very wonderful team going. And if you are doing this in 3 months it is pretty ambitious too but if you got what it take you can definitely do it.

    I really liked what Banala said about using Brushless DC motors. I hadn’t seen them before coming to US but here that is what we have used in all our projects.
    U can go to
    http://www.maxonmotor.com/index.htm and
    http://www.micromo.com/ to find such motors.
    The have planetary gear train systems and save a lot of space. Maxon is pretty expensive but look for micromo or other vendor sin India. My disclaimer is I am not sure how this might fit in your things but something you can explore.

    Also if you all have the passion try visualizing telling the wheel chair to move forward and u sitting in it and moving forward. visualize telling it to trun right and u cutting a sharp right corner in it. And try doing it every single day. It will make you work more fun and every easy.

    All my best wishes.
    Mayank

    BTech/IITG/ME/2003
    MS/OU/ME/2005
    Engineer/2H Offshore Inc.
    Houston, TX, USA

  8. Prosper Ooi Says:

    Hi there all,
    It is good that you have decided on such a project. This will give you all both mechanical and electronic experiences, and also understand the difficulties of decision making. I think that it not only the finish product that you will have but also the invaluable experiences ind dealing with members of your team, others poeple, outside influences, setbacks as well as the stresses of meeting deadlines. I wish you all Good Luck, and remember the most important thing is not actually the end result but how you go about organising the project. There are literally hundreds of alternatives to consider but remember, the simplest is going to be the best in this case !!!
    Thanks, Best Regards
    Prosper

  9. tawit Says:

    [Friends, these are some suggestions about Motor which i got in response of my enquiry in the Engineering Group OSMC]

    “In my opinion, may be you need DC motor for simply of your project. Because
    Brushless DC motor is not easy to control.
    It’s nice project..”

  10. Bob McRee Says:

    [Friends, these are some suggestions about Motor which i got in response of my enquiry in the Engineering Group OSMC]

    ..some with internal reduction gearing, brushed and brushless with simple
    inexpensive controllers. check with Joshua at evsolutions. com. He has
    provided hub motors for wheelchair use for another customer recently,
    and should be able to help you.

    -bob

  11. Bob McRee Says:

    [Friends, these are some suggestions about Motor which i got in response of my enquiry in the Engineering Group OSMC]

    The brushless hub motors use Hall sensors to control the timing of the
    pulses to the windings. these are open collector signals generally
    between 12v and 0 so you could pad them down to ttl level. depending on
    the number of motor phases and magnet poles (typically 3 x 16) you will
    get 48 pulses per revolution by monitoring these sensors or 16 per
    revolution from each of the 3 sensors.. driving a bldc motor with a
    microprocessor is not really a job for someone without any experience
    in
    this technology. there are plenty of programming examples for the PIC
    at
    Microchip or for the many other controllers available. My advice would
    be to back up a bit and learn more about motor control before taking on
    a project this big.

    -bob

  12. Mani Sir Says:

    [Dear Frineds, These are the suggestions given by Mani Sir when i send a mail aregarding the selection of motor and Battery]

    Nisha, You can use hub motors if available to you.
    I don’t get your idea about the battery. Battery is a collection of
    cells.
    I think, you have to use rechargable batteries of needed capacity and
    LED
    ACID BATTERY IS a good choice. If you want weight reduction, then you
    need
    to go for LIon Batteries or similar which will be very costly.
    Will discuss all matters when I am in the college. Hope you recovered
    fully.
    Regrds,
    Mani

  13. Mani Sir Says:

    [Dear Friends, Please read ManiSir's Advice..Do read t seriuosly]

    Dear Nisha,
    I also suggest you to go for SMF battery for your project. You need to calculate the battery voltage and its Ah capacity.
    Your blog about the project is very good. This will encourage other project batches too. My congratulations to everyone of your batch. However, I request you to deeply involve in the design aspects rather than spending more time to beatify your web page.

    The presentation of the project proposal was not up to the mark and your team members could not convey the project idea fully to the faculty.
    I could not see your page 1 flow chart ( checkup if anything wrong in your page). The software flow chart page 2 ( keyboard control) seems to contain some logical errors. Please correct it. You have a lot of work that are not yet started. I fear, if you are going at this rate, you will not be able to finish even the design fully.
    You may take it as a warning or as a advice.
    regards,
    Dr. T.K. Mani

  14. Monir Says:

    Great work guys. But i could n’t find email adresses for the group members. I am a masters student at University of Manitoba and i would like to contact some of the group members. I will really appreciate if someone gets back to me.

  15. Mani Sir Says:

    [Dear Friends, Please go through Mani Sir’s Suggestions..I fear we are lagging a lot..]


    Dear Nisha,
    Bicycles hub motors are normally of high RPM. May be you will get hub motors suitable for wheel chair application also.
    If you are able to get motor from China it is fine. Do not worry about the driver. You can make good driver by yourself ( even though it is difficult). In India no one is making BLDC.
    We will discuss about the problems in software when you are in the college.
    The success of a project depends upon the decisions taken at the right time.
    Now it is high time to take a bold decision about the motor.
    Regrds.
    Mani (08/02/07)

    Dear Nisha,
    One company in Banagalore is making DC motors. One of my friend bought amotor with the gear and an electrical clutch for his automatic gate. I will let u know the address of the company if you need.
    The H brdige drive has a lot of bells and whistles, But I do not suggest you because of the other inherent probelms that you ar going to face when making the hardware. Moreover, you dno not require many of the features now for the prototype. You have to add adtional heat sinking arrangement for th chip which will be a problem for you in practise.
    Anw way. decide the motor first and then think of the driver.
    I could notice the same type of logical errors in the first page of the flow chart also
    Regards(07/02/07)

    Dear Nisha,
    If you are looking for DC PM motors, then you will get it from India at a better price.
    Also I suggest you to go for H bridge with discrete components whihc will be more reliable than the “chips”
    -Mani (06/02/06)

    Dear Nisha,
    There are BLDC motors with in bulit drivers and sensors. But many of the BLDC motors are coming without the drivers. So you need to make one and use an MCU to control it. You can download the sftware for driver ( PIC) from microchip site
    However, for this application, I think you can use HBridge for controlling the motor speed. Some times you will have to use regenerative braking in which bldc will be better.

    Regrds
    Mani (05/02/07)

  16. Brad Graham Says:

    [Dear Friends, Please read this mail and check the sites he has mentioned…it will be really good for us]

    Great stuff!

    I have done two voice controlled robots, and both use wheelchair
    motors and controllers based on the OSMC. The question is, how fast
    do you want to go? Wheelchair motors at 150 RPM will be useable from
    1-5 MPH with plenty of torque. Here are a few of my bots…

    http://www.atomiczo mbie.com/ gallery-robot. htm

    Oberon had a laptop running the MS SAPI 5 for voice commands, and the
    othe unit Goober sent the audio to a remote computer through wifi for
    processing.

    Here is a place that sells refurb wheelchair motors…

    http://www.npcrobot ics.com

    Good luck!
    Brad

  17. Little Titan Says:

    [Friends please read these suggestions]

    Hello

    If you are considering the wheel chair the weight of the whole
    system should be minimum. So considering that you can opt for ac
    Induction Motors.. the induction motor can provide more power than
    BLDC when you are considering weight… and you can opt the Ac drive
    for the Induction motor controlling. . There are many vendors available
    for the solution of Motor drive… Its possible to achieve the AC
    drive using microcontrollers as well as DSP chips… but for a
    model/starter it is better to have the microcontroller. ..

    Many microcontrollers are available the solution…. .. the PIC based
    controling is very easy and many eratta and apllication notes are
    available from http://www.microchip. com…..

    If you are opting for DSP it is better to go for TMS220XXXX family
    that it is specially designed for the power electronics applications. …
    From TIs web wast amount of informations are available… .

    Many companies are working on your area/project. …
    williamsonslab, johnson and johnson etc are a few……

    CDIT calicut is already evolved in this type of projects for
    hadicapped.. ….

    Thats all sorts I can share with you…..

    Any type of information welcomeeeeee. …

    Please share your experiences

  18. Gav B.Master Says:

    [Friends…BLDC in India!!!!]

    Hello,
    I , Gav B Master kindly give me your requirement as we can supply you BLDC Brushless DC motor 12 volts motor as per your requirement kindly give me your requirement or utility for using such motor.

    Gav Bomi Master
    1/799, Meher Villa,
    Kotwal street,
    Nanpura,
    SURAT. 395001
    http://www.geocities.com/itvd2004/index.html
    http://www.geocities.com/solartransit/index.html
    gav_master007@yahoo.com
    gav_master007@hotmail.com
    Mobile :9925207060 — 02612470060

  19. Mani Sir Says:

    [Friends..pls read the mail and act fast]

    Dear Nisha,
    For wheel chair motors, Please see and act fast. This is auctioin site. Please let me know if I can beof any help to u.
    Mani

    http:cgi.ebay.com/BATTLE-BOTS-Wheel-Chair-Motors-plus-tires-Robotics_W0QQitemZ140082611043QQihZ004QQcategoryZ50924QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

    http:cgi.ebay.com/BATTLE-BOTS-Wheel-Chair-Motors-plus-tires-Axle-unit-WOW_W0QQitemZ140083260616QQihZ004QQcategoryZ50924QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

    http:cgi.ebay.com/BATTLEBOT-TANK-COMBAT-WHEELCHAIR-MOTORS-WHEELS-CONTROLS_W0QQitemZ290079668974QQihZ019QQcategoryZ71400QQrdZ1QQcmdZViewItem

  20. Mani Sir Says:

    Dear Nisha,
    This is the address of the motor manufacturer in Bangalore;
    Please contact them and collect details

    Address 22,12 Cross, Pipeline Road, Vijayanagar Bangalore23,

    City Bangalore

    Pincode 560023

    State Karnataka

    Phone No 23502061

    Regrds.
    Mani

  21. Pixel Says:

    [friends chech this opinion]
    Hi,
    I’m not positive about how well they might match your specs exactly,
    but have you considered the NPC gearmotors from National Power Chair,
    being as these are wheelchair motors? The NPC-41250 looks to be pretty
    close at 93 RPM at 12V. I don’t believe it’s going to get too close to
    150W however…

    http://www.npcrobot ics.com/products /viewcat. asp?cat=20& mode=gfx

    PF

  22. Mani Sir Says:

    [Friends..Mani Sir’s Reply]

    Dear Nisha,
    Glad to know thatyou got the motors.
    Hope you will be able to proceed much faster.
    I tried to download the flowcharts, but no luck.
    Regrds,
    Mani

  23. Raghu Says:

    a small doubt…are some of you really ‘working’ on this project?…doing something only when you get time after all other engagements is not called ‘work’….we used to tell it as HOBBY…for you this is your primary responsibility and task that should get the topmost priority…all of you are tomorrow’s professionals and hope you will become a TEAM and complete the project stictly adhering to the schedule.best of luck.

    Raghunath M.D.
    JTO(Computer Cell),BSNL, Ernakulam

  24. PRAKASH Says:

    simply superb
    feel proud

  25. sachin Says:

    sir,
    currently i m also working on this type of project o wheel chair can u send me more information about ur project and abstract of urs project ..
    I m a final year BE student ..
    It would be very helpful to me….

  26. aldrin gerald Says:

    good day!

    Congrats! nice job! I hope i can be as good as you are…

    may i know what are the limitations of your project?

    I am also an engineering student and currently working with the same topic. I would like to use your project as my reference(related works) but i need to improve something.

    can you send me more information about your project…

    i am hoping for your help…

    thanks!

  27. techtriks Says:

    Hello Aldrin,
    Sorry for the delayed response. Please let me know what all information you need in this regard.

    Which microcontroller you have been using?
    What all functions you want to incorporate?

    In our project we thought of implementing many features, but couldnot add all those features due to limited time.
    You can look for adding regenerative breaking in your project.
    also u can think abour adding some clutch mechanism
    then the design mech. design itself u can do lot of modifications..

    If you need any assistance, please feel free to write to me..
    Best Regards..
    NISHAMS,
    nishams84@gmail.com

  28. Aldrin Gerald Says:

    good day! Thanks for your reply. no need to apologize for the delayed response. have you heard the quote “better late than never”? hehe… actually our voice controlled motorized wheelchair is almost finish and we are sheduled to defend it on the first week of august. the components we used are the same as yours. for the electronic part we used PIC16F877 and HM2007. for the mechanical part we used 12V Wiper Motor, 8 teeth industrial sprocket, 15 teeth BMX sprocket, 4″D caster wheel, and BMX chain. But instead of using a wheelchair made of steel, we used a wooden chair. Why? to make it easier for us to modify the chair if needed. Is it really necessary? not really, but we did it anyway. our plan is to add sensors on the back of the chair for obstacle detection. The sensors will be normally off. It will be turned on only if the user commanded the chair to reverse or move backward. we are not going to have speed control. the speed will be constant. our objective is to be able to drive the chair even on an inclined plane with a maximum of 15 degrees inclination. our maximum load or the weight of the passenger is 190 lbs. We havent perform any testing yet. so we are not sure if its going to work. we are doing our project by reverse engineering or should i say cheating.hehe. we did not compute for anything. like how did we come up to using a 12V motor? we are going to finish it by experimentation. and we are running out of time. hehe. i am afraid that our panel may ask us to have speed control. do you have yours? what are your available commands? or simply how your wheelchair works? i am also worried about the computation. it is needed in the documentation. i am currently reading Applied robotics II and http://www.simreal.com. Any suggestion? This is really humiliating. I call myself an engineering student yet i dont know that much. And worst, i am a graduating student.hehe. i really appreciate your response and i will consider it a blessing if you reply again. thank you very much.

    • kathercia Says:

      hi, wheelchair with voice recognition yung prototype namin ngayon.. baka naman pwede mong isend sa email ko yung soft copy ng thesis nyo.. pls.. we nedd a basis, nahihirapan kasi kami mg include ng mga computations eh..klangang klngan namin yon.. please..

  29. NISHAMS Says:

    Dear Aldrin,
    Its really a great work…All the best.
    Yes we have done speed control in our wheelchair. You can control the speed by using PWM technique.How are you driving the motors? We have used MOSFET H-Bridge for controlling the motor. So you can change the PWM and can vary from 20% to 80% for achieving different speeds. Please let me know about your driver ckt, so that we can discuss this in detail related to your ckt.

    Best of Luck…….
    NISHAMS

  30. Aldrin Gerald Says:

    hello Nishams,

    Thanks,
    But it’s not yet finish.
    Problems may occur during the testing.
    Wish us luck!

    We did a research and found a simple driver circuit. It is composed of NPN Bipolar Junction Transistors and relays.

    So how does your wheelchair works? How many commands do you have? what are the speeds available? the normal and fast speeds? the maximum weight it can carry to move?

    very thankful,
    aldrin

  31. NISHAMS Says:

    Hello Aldrin,
    Good luck….
    In our wheelchair we used relay and MOSFETs for driving the motors. PWM technique is used for speed control. You can implement different speeds(from say 20% PWM to 100%). We have implemented 2 different speeds- one is minimum speed(30%PWM) which i remember, similar to average walking speed, second one is a bit more fast(70%). It was capable of carrying 150Kg in normal speed.
    Code size, i am not remebering the exactly now.. But it was not too big. however you can manipulate it accoring to your logic…
    All the best..
    NISHAMS

  32. gerald aldrin Says:

    hi Nishams,

    i am not really familiar with mosfet but i guess we used the same circuit…
    let me send our driver circuit to your email add… just to make sure…
    please look at it…

    what language and compiler did you used in programming your microcontroller?
    we used BASIC…

    thanks,
    aldrin

  33. gerald aldrin Says:

    hello Nishams,

    aside from we are not informed very well with MOSFETs, we used BJTs because we just need a switch to turn N and OFF the motors since it already have a low speed and high speed terminal. We connected the wire to the highspeed. So our speed depends on the specs of the motor.

    by the way, what motor did you used? we used wiper motors…

    thanks,
    aldrin

  34. NISHAMS Says:

    Hi Alridn,
    We have used permanent magnert DC motor(60W/100rpm. You can find those calculations in this page itself(February2007interactions). This is designed by us(after a lot of trials. please go through those interactions for more details ) and Manufacuted by one of the companies in bangalore, India.
    We have programmed it in MPLAB(assembly level programming). However if if you are not confortable with this you can go ahead with BASIC(I guess, its PIC BASIC)right?.Only problem with compilers is if you are looking for precisie interrupt service routines , it wont be be that accurate like assebler..anyway here i think you dont need such precision….
    I will go through your ckt and get back to you soon..
    All the best
    NISAMS

  35. NISHAMS Says:

    Hi Aldrin,
    Sorry.. the detailed interaction about the motor design is not in this page. Its in the home page.
    https://techtriks.wordpress.com/2007/01/09/hello-world/#comments
    NISHAMS

  36. Sudheerama Says:

    Hi, I’m Sadheera from Sri Lanka. I found your email address from one of my group members. Also my group members told me that you are happy to help to success our project. I think you already know that we are going to build a voice controlled wheelchair which was built by your group in the last year.(we are not going to make same kind of wheelchair, but a product with advance futures) Here we are going to use hm2007 chip to recognize voice commands & pic16F877 as the controller.

    So we need to get know that what type of motors & motor controllers were used to build your wheelchair. Because we need to build a speed control unit to increase or decrease the speed of the wheelchair as the user needs. To build a something like that, still we couldn’t find a good motor & a motor controller to archive our target.
    If I’m not wrong, did you use wiper motors? Because when I zoomed-in the pictures of your wheelchair, the motor which I saw is like a wiper motor. So I need to know, can we use a wiper motor to archive our target. Is it enough to carry a man at a high speed? If it’s yes, then what are the specifications of the motor which was used by your group?

    So please be kind enough to send the information that you have as soon as you can. Because the time we have is very limited.

  37. NISHAMS Says:

    Hi,
    1. We have used permanent magnert DC motor(60W/100rpm. You can find those calculations in this site(Home page 4th February 2007 interactions -https://techtriks.wordpress.com/2007/01/09/hello-world/#comments). This is designed by us after a lot of trial runs (please go through those interactions for more details ) and Manufacuted by one of the companies in bangalore, India.

    2. In our wheelchair we used relay and MOSFETs for driving the motors. PWM technique is used for speed control. You can implement different speeds(from say 20% PWM to 100%). We have implemented 2 different speeds- one is minimum speed(30%PWM) which i remember, similar to average walking speed, second one is a bit more fast(70%).

    All the best..
    NISHAMS

  38. gerald aldrin Says:

    Hello nishams,

    you control your speed by increasing and decreasing the current going through the motor by PWM…
    did i understood it right???

    how did you know that your min speed(30% PWM)is the average walking speed?

    also, im now a little bit bothered with the transistors we used…
    aside from allowing speed control, is there something else that makes BJTs inferior to MOSFETs?

    i appreciate all the info you have shared and will share…

    thanks a lot,
    aldrin

  39. gerald aldrin Says:

    hi nishams,

    i am also interested how steep can your wheelchair climb?

    tnx,
    aldrin

  40. gerald aldrin Says:

    hello nishams,

    by the way, there’s no need to go through our driver circuit. i just want to know if we have the same circuit. but thanks anyways…

    what i am really interested about is how you did your testing? i mean how many trials did you do? and is there any basis for doing it in such number?

    We are about to begin our testing this weekend. And it will be included in our chapter 4 which is analysis and interpretation of data and results. friends told us that the number of trials does matter. any suggestion?

    Our coordinator gave us more time to finish our project(two weeks). Thanks God!

    Whew!luck is ours,
    aldrin

  41. NISHAMS Says:

    Hi Alrdrin,
    Again delayed response!!!! i was really busy with my works…
    By changing the pulse width, you are effectively varying the average voltage.. and thereby the speed of the motor…
    Initially we have done lot of experiments by mannually running the chair, as well as just connecting the battery directly to the motorised wheelchair. From that we found some speed which is close to average walking speed. Then using differet PWM we tried to achieve this speed. This calculation is depends on the dimensions of the wheelchiar, the mechanism etc…like the diameter of the wheel…You can find some internal interactions regarding this…

    Hai Alrdrin, i am wrting to you in the middle of some work..i will write you more tonight (IST).. Please dont mind…

    All the best..
    NISAMS

  42. jan Says:

    hey!!
    i think you guys have done an awesome job. my group and i want to do this proj for our final yr proj.we are in ece,vtu. though we are all charged up about this proj,sadly we do not have much information about it. i have read stuff on your website(which is great i must say) but it would be great if you could tell me if hm2007 is easily available in india and what is its cost?
    also i would really appreciated it if you could suggest us going ahead with it because the ppl whm we spoke to uptill now have not been very encouraging(sadly).
    and finally what is the total cost of the entire proj?
    i really really hope u reply… really desperate to get a feedback
    thaking you

  43. NISHAMS Says:

    Hi jan,
    Very happy to hear that you ppl are interested in this project. Unfortunately HM2007 is not available in India. We have sourced it from USA.. Earlier in this webpage itself i have given the details/links etc. Please check earlier interactions..if you could not find it i will send the details soon…..

    I would assure all possible assistance for your efforts..Please go ahead …All the best..

    NISHAMS

  44. jan Says:

    hey nishams,
    thankyou very much for your feedback. we found out the details about HM2007. I would really appreciate if you could guide me about the specifications of the MOTOR and BATTERY used in your project. It would be of great help to us.
    waiting in anticipation
    jan

  45. manoj Says:

    Guys,
    Great work!i liked your project very much and looking forward to do it…could you pls tell me about interfacing PIC and HM2007….
    i am from ASE,kollam.

  46. NISHAMS Says:

    Hi Jan, Manoj,
    Sorry for the delayed response. I was out of station. Will look into your quires and will reply as soon as possible.

    All the best..
    NISHAMS

  47. saravanan Says:

    hi friend
    ur project is nice.
    we are doing final year engineering.since we are interested to do this project with advance technology.so,we are in need of ur project details with control circuits.

    so please send the details to above mail_id.

    waiting for favourable reply

    Thank you

  48. Rupali Says:

    Hii friends.!!!

    I really appreciate ur work, great efforts indeed..!!

    I am pursuing the same as my final yr project, m from electrical branch. And ur site is really helping me out. thanks a lot.!!

    Hey can u just brief me out regarding the programming side of this project? Hardware is quite ready, m mingled up in programming..like how to start and all..I would be really grateful to u..!! Awaiting a positive response 🙂

  49. Rupali Says:

    Please mail me at rupalirjain@gmail.com
    Thanks again..!!

  50. saransatyan Says:

    Hi,
    Can u plz tell me whether HM2007 are available at chennai?and its cost also plz..Is there any alternative for this IC?

  51. NISHAMS Says:

    Hi Rupali,
    Sorry for the delayed reply.
    We have done our project in MPLAB(Assembly programming. You may use C compiler as well. Anyway the logic is not very complex.
    Since 8 bit output pins of HM2007 is connected to the input pins of the Microcontroller, in the program we can scan the status of these pins according to this you can generate the control signals at the out pins for controlling the motor driver….
    If you need any further clarification, feel free to write..

    Best of luck…
    NISHAMS

  52. NISHAMS Says:

    Hi Saranya,
    we have shipped HM2007 from US… It was costing around Rs. 1700-2000

  53. vinutha Says:

    hi!
    This is vinutha,a final year student doing the same project.I had some doubts regarding the motor calculations hope that you will help me out.
    I went through your calculations and you have got the rpm caculation as 30rpm so why is that you have used 100rpm motor? Is it because of the chian-drive(gear ratio),if yes what ratio have you used?
    And plz tell me more about the motor-driver circuit,if possible can you send me the schematic?
    Thank You
    vinutha

  54. NISHAMS Says:

    Hi Vinutha,
    Hope u have gone through the power calculations of the motor.(Pls refer our interactions). We had done so much trial and error/experiments before finalizing the motor. There were so many dependent parameters involved in these calculations, for example the diameter of the wheel, dimensions of the chain sprocket mechanism etc. etc.. Then we related all these things with a practical speed, which is close to the average walking speed of a human being. Though we calculated as 100rpm,finally we went for a 60rpm motor.. You may please refer our previous interactions for more details on this..

    Then Motor driver part- we have used MOSFET H-Bridge circuit for driving the motor. I would be glad to help you out if you people could design a driver ckt and discuss with me. The intention of the webpage is to help and support people who are interested in design/Development. I can very well give you the detailed schematics,but i personally feel, copying something is not really good..So please try to design a driver ckt, if you find any difficult at any stage please feel free to post your doubts, i will try my level best to help you….
    All the best..
    NISHAMS

  55. gautamsakthi Says:

    can u plz explain how inputdata enters hm2007 and how it is stored in sram and where it is compared with the spoken word(whether in hm2007 or sram)and whether to connect hm2007 data pins or sram data pins to microcontroller(which controls the car).I would be greatly thankful if u reply to my mail id:gautam.sakthi@gmail.com

  56. NISHAMS Says:

    Hi Gautham,
    There is a successive approximation ADC is there in the input block of HM2007, which converts the analog signal -coming from the mike to the analog input- to digital form, then this digital data will be stored in the SRAM memory locations-00 to 40- Then in listening mode the comparison is done in the HM2007 itself. when both the data match, HM2007 will give the output (8bit)and which will be equivalent to the memory location where the matched word is stored. Please find the complete circuit diagram in the hardware section of this website. If you have any further concerns please feel free to write to me..
    All the best.
    NISHAMS

  57. yusuf Says:

    hello…

  58. yusuf Says:

    it was a ray of hope given by you to the physically challenged persons, for that i congrats
    you people. can i know how much the product will cost? and whether it is possible to use alternate IC’s instead HM2007?

  59. yusuf Says:

    plz explain how inputdata enters hm2007 and how it is stored in sram and where it is compared with the spoken word(whether in hm2007 or sram)and whether to connect hm2007 data pins or sram data pins to microcontroller(which controls the car).please send me schematic of speech recognition and motor driver circuit if possible, it will be very useful to design such a product

  60. NISHAMS Says:

    Hi yusuf,
    Please refer the last interaction in this page. I have given answer to the same question in a detailed way..

    All the Best,
    NISHAMS

  61. gautamsakthi Says:

    thx sir for ur valuable information ill mail u if i have any doubts….

    …..sir, can u please specify the type of keypad employed in voice recognition circuit(2007).whether it is a ordinary 4*3 keyboard or it has any special specification?

  62. NISHAMS Says:

    Hello,
    U can use a normal keypad, no need for the special charas, except * and #, You may please refer the ckt , given in the site. How ever for our project we have designed our own keyboard in the same way…https://techtriks.wordpress.com/pcb/
    All the best,
    NISHAMS

  63. gautamsakthi Says:

    sir can i use any 3*4 keyboard?

  64. NISHAMS Says:

    Yes, You can.. Provided the connections to the input pins are same as per the datasheet of HM2007

    NISHAMS

  65. NISHAMS Says:

    Dear All new comers from India,
    Its a glad news to u all..HM2007 is available in the following shops at Ritchie street, chennai.
    1.ajantha electronics
    2.omega electronics
    3.textronics
    Besides these shopes you may try in other shops too, its heard that HM2007 esily available in Ritchie street.

    Cost is about Rs.1200-1400/-

    (Ritchie street is the electronic street in chennai)
    Root to Ritchie Street: Mount Road-Anna Statue- Opposite street to Batashop

    Thanks to Saranya and team from chennai for sharing this information. It will be highly helpful for so many local students..

    NISHAMS

  66. yusuf Says:

    dear sir ,

  67. jan Says:

    hi nisha
    i am finding difficulty in designing the H-bridge drviver circuit.Can you please help me out with what approach i should take for the same.
    I am finding difficulty in deciding whether only MOSFETS or using MOSFETS,Optocouplers and relay.
    I would also like to know the which MOSFET to use to drive a motor of 12v,80W.
    Waiting in anticipation for your help and reply.
    Thankyou

  68. NISHAMS Says:

    Hi jain,
    You may go for full bridge with 4 MOSFETS or may use MOSFETS and Relays since among the diagonal MOSFETs in the bridge one will be in switching(ON/OFF only)and the other,is used for the speed control.

    I will post the details of MOSFETs by tomorrow.

    All the best,
    NISHAMS

  69. gautamsakthi Says:

    Can anyone say wat is the best alternate for hm2007 and if u r doing voice recognition in chennai plz inform by mail(gautam.sakthi@gmail.com)

  70. NISHAMS Says:

    Hi jain,
    The MOSFET we have used is IRF150, if you are not finding it, you can try out the alternative one. Pls refer the ‘Reference’ page links for datasheets..
    All the best
    NISHAMS

  71. Gautam Sakthi Says:

    wat is the output voltage level of hm2007 DATA pins and latch enable pins for me its coming output voltage level is .5(low) and 1(high).are these voltage levels enough for inputing to 74ls373 latch if these levels are not enough wat should i do to increase the voltage?

  72. techtriks Says:

    Hi Gautam,

    Please let me know for which application you are using HM2007? There are a few other chips available for voice recording/play back purpose. However if you want to use it for a project like our Wheelchair, i think HM2007 is the simplest and easiest one.

    Noe your second question- about the voltage levels of HM2007 output…
    All the Output pins are TTL compatible..i.e logic high is ideally 5Volt and logic low is 0volt… See, the latch- 74LS373 is also a TTL compatible chip. So i don’t clearly understand your question about level transition.

    As i have mentioned earlier, There is a successive approximation ADC in the input block of HM2007, which converts the analog signal -coming from the mike to the analog input- to digital form, then this digital data will be stored in the SRAM memory locations-00 to 40- Then in listening mode the comparison is done in the HM2007 itself. when both the data match, HM2007 will give the output (8bit)and which will be equivalent to the memory location where the matched word is stored. Please find the complete circuit diagram in the hardware section of this website.

    Best Regards,
    NISHAMS

  73. Gautam Sakthi Says:

    my project is voice controlled robotic car.do u have the clear circuit diagram of all connections from hm2007 to sram and latch similar to the one u gave in ur ppt.in that connections from hm2007 to latch was not speccified.also i think hm2007 is cmos logic.

    • techtriks Says:

      Hi Gautam,
      Please check the hardware section, i have uploaded the complete ckt diagram for voice reco. https://techtriks.wordpress.com/hardware/

      You are right, HM2007 is a CMOS LSI chip, But i was trying to convey you is that its output pins are TTL COMPATIBLE. i.e. logic high is +5volt and logic low is 0.
      Please note most of the controllers we use, are based on CMOS logic, however the IO logic of most of them are TTL compatible. Please refer more on common IO logics….

      Hope your doubt is cleared…Anyway if you have any further concerns please feel free to write..
      Regards,
      NISHAMS

  74. Saranya Says:

    hi,
    In the voice recognition circuit,we connect certain pins of HM2007 to the keypad.may i know which pin in the ic is to be connected with which key number in the keypad?
    Saranya

  75. techtriks Says:

    Hi Saranya,
    I have uploaded the ckt diagram for the key board interface.

    https://techtriks.wordpress.com/hardware/

    please refer it. If you have any further doubts please post it..
    All the best..
    NISHAMS

  76. Saranya Says:

    hi,
    may i know if there’s any way of testing the working of sram seperately without being connected to HM2007?and..in the display section, should both the displays be considered together or induvidually?

    • techtriks Says:

      Hi Saranya,
      If you want to check the SRAM, you need to interface it some cktry which can give the input.. or you may try feeding inputs manually (after establishing the necessary connections)and can check the output.. But may I know in what context you suspect your SRAM malfunctioning?..Have you faced any problem with SRAM when you interfaced…?

      Then with reference to your query on Display.. If your memory location -where you saved your digitally converted data- is higher than 09(Note, you can store your voice input to any memory location from 00 to 40)then you need two digits to visualize it. But this display is an optional section, its only needed if you want to cross check whether HM2007 is giving the correct output or not..

      If you have any further questions please feel free to write..
      Regards,
      NISHAMS

  77. Saranya Says:

    …today,i gave the input using a trainer kit and connected the output to led’s in the kit.and..when we trained HM2007 the output was not satisfactory.we faced some problems while retriving the word. may i know if the training process involves just entering the word for storing and when we repeat the word,the memory location would be displayed? Thank you so much for the immediate response you provide us.its really helping us a lot.
    regards
    saranya

  78. Akhil Says:

    Hi,
    I am Akhil Mohan doing my B.Tech in Electronics and Biomedical at MEC. We are doing a project similar to yours.I read your project report and had some doubts regarding motor and h-bridge section. Could you please help us out ?

    Regards,
    Akhil

  79. jan Says:

    hey NISHAMS,
    Thanks a lot for the help that you have provided previously.We are actually trying to estimate the cost of the H-bridge ckt and i have read somewhere on this website that the H-bridge ckt cost you 1800/-. I wanted to ask you whether this is the cost of one H-bridge ckt or both together.
    Thankyou

  80. Alexwebmaster Says:

    Hello webmaster
    I would like to share with you a link to your site
    write me here preonrelt@mail.ru

  81. Saranya Says:

    hi,
    may i plz know, when interfacing the pic to hm2007,which set of pins from 36 to 43 should be made high to read data?
    Regards
    Saranya

  82. techtriks Says:

    Hi Jan,
    H-Bridge ckt was not so expensive. We might be mentioning something else in that discussion.

    We did lot of experiments before finalizing the H-Bridge.At last we have designed a ckt with one MOSFET(IRF 150), one DPDT relay, one BJT (BC 547-for driving the MOSFET) and one power transistor(TIP 122 for driving the relay)-for driving a motor(with speed and direction control.

    In any case the cost will be less than Rs.500/-

    All the best..
    NISHAMS

  83. techtriks Says:

    Hi Saranya,
    Hope you have been mentioning about HM2007 pins(D0-D7).These pins are output pins of HM2007 which will reflect the output during recognition. Please read the datasheet of HM2007(page no 5).
    If your question is something different please write back in detail…
    regards,
    NISHAMS

  84. techtriks Says:

    “Alexwebmaster Says:
    March 3, 2009 at 6:55 pm e
    Hello webmaster
    I would like to share with you a link to your site
    write me here preonrelt@mail.ru

    Hello Alexwebmaster,
    Please write to me with details to my mail ID- nishams84@gmail.com

    Thanks,
    NISHAMS

  85. Saranya Says:

    hi,
    In the voice recognition circuit,the LED is not blinking momentarily even after we speak the word.we tried checking all the connections.but could not find the reason.May i know why is this happening?
    regards
    saranya

  86. techtriks Says:

    Hi Saranya,
    Please check your connections once again. If HM2007 is good, then it should blink. Anyway please go through page no 5 of HM2007 datasheet. Please do the memory check, keeping the WAIT pin low. If its working properly then both HM2007 and HY6264 is good.If so there is something wrong with your mike interfacing.. If its not doing the memory check properly, once again rewire and do the same.. HM2007 wont go bad so easily..
    All the best

    • kunal kashalkar Says:

      Hi,
      how to check wheather hm2007l working properly or not, in my case i made the circuit mentioned in hm2007l datasheet, but not get desired result means after giving 5v supply voltage to hm2007l ready indication led not turned ON, i double check connection also disassemble circuit connection & make one more time circuit connection,how i know is me make mistake in making circuit connection or hm2007l working improperly, also for hm2007l working as a voice training mode & recognition mode.

  87. techtriks Says:

    Gautham: my Hm2007 data enable pin(falling edge latch) output is very low it decreases from 0.2 volts to 0 volts while latching the data.,so i cant latch the data how to check practically whether the data has been stored in the ram while training because while training my led blinks very lightly so i have a doubt whether the data is stored in my ram. i have attached the datasheet of hy6264. i am using this ram in my circuit instead od hm6264.u plz see the datasheet and say can i use it instead of hm6264.

    Answ: Please go through page no 5 of HM2007 datasheet. Please do the memory check, keeping the WAIT pin low. If its working properly then both HM2007 and HY6264 is good.

    Gautam: my circuit is working well. i got the output. i directly connected 26th and 28 pin if ram to supply thanks a lot.
    how to interface hm2007 with 8051 microcontroller ? can i connect the output of the latch to input port of microcontroller?

    Answ: Yes you can connect te output pins to the IO pins of 8051. Remember, you must properly set the IO pins of 8051 as INPUT.

    Gautam: which pcb design software can i use for the hm2007 circuit.if u have the download link pls send?

    Answ:You may use any PCB design software for designing the board. Designing the HM2007 board is same as that of any other board. I used ORCAD. there are many softwares are available like this. PROTEL, EDWIN XP, KEYCAD etc are some.. However for beginners ORCAD or PROTEL is not the best choise and also these are a bit costly softwares. You may look for some softwares like TraxMaker, PADS etc.. these may be available for free download, you may find so many of these tools in the free CDs which comes along with technical magazines like EFY, Digit etc..
    All the best,
    NISHAMS

  88. Saranya Says:

    hi,
    In the voice recognition circuit,we connect a LED to 26th pin of sram.so when we give 5v supply,does it mean that the LED would absorb 1.7v and only the rest would be supplied to sram?may i know whether a diode is necessary for the connection?

    regards
    saranya

  89. techtriks Says:

    Hi Saranya,

    The 26th pin of SRAM is CS2(Active high Chip Select. You must connect this pin directly to VCC.
    Please refer HM6264 datasheet(especially page no.3-Truth Table).

    Regards,
    NISHAMS

  90. jan Says:

    hello,
    the hm2007 chip that we are using is not responding to anything. we are not sure if the chip is working or no. do u know any method by which we can test the ic. there is no 48 pin tester avaiable here. we have also rigged up the circuit 6 times now, but it just doesnt respond. PLZZZ HELP

  91. divyesh Says:

    hi,
    m workin on the same project as urs. i need a favour. do hav the datasheet of hm2007 other than that is available online and what were the mistakes in its application ckt.what does st1 and st0 signify in the cpu mode.actually we hav to submit the project in ten days so it wud be gr8 to hav ur response asap.. thanku
    divyesh

  92. techtriks Says:

    Hello Jain,
    Please do the memory check.. and find out its responding…

    All the best..
    NISHAMS

  93. techtriks Says:

    Hi Divyesh,
    Unfortunately there is no other datasheet is available. We were also using the same one..

    If you are doing the same project like ours,then you don’t need to bother about the CPU mode. Please follow the ckt and the steps given in the below section.

    https://techtriks.wordpress.com/hardware/voice-recognition/

    If you have any futher concers, Please write…
    All the best..
    NISHAMS

  94. jan Says:

    hey,
    we followed the steps for the training of the hm2007.everything is going smoothly till we press the train button. but after that when v speak the word the LED does not blink. so the word is not gettin stored. we connected the 26th pin of hm6264 directly to vcc n checked too, but no luck. v did the memory check and it is clearing. so we dont understand what the problem is. Please can u tell us what it might be.?

  95. techtriks Says:

    Hi Jan,
    If you are confident about the connections, Then only reason i could find is input/ audio signal level. The HM22007 AGC (automatic gain control) specification is 0 dB to 40dB. For example, an acceptable input level range is 20mV to 0.2V.Please make sure your audio input to the chip satisfy this…
    All the best,
    NISHAMS

  96. techtriks Says:

    Saranya: hi,could you plz explain me the procedure for retriving the word from hm2007? i’m able to train the word but not able retrive it.
    Answer:Hi, if you are sure that you could train the chip as per the instructions. Then it should work. Once the training process is over the chip will automatically switch to recognition mode..i.e. if anything you spell without pressing any of the buttons the chip will be continuesly in listening/recognition mode. Please refer paragraph titled Voice Recognition in the following link for more details.. https://techtriks.wordpress.com/hardware/voice-recognition/
    All the best,
    NISHAMS

  97. seshu.k Says:

    hi nisha,
    if i solder the circuit properly are u confident that it will work as expected…?
    Also…are u using an breaking system in this….
    which batter are u using…and is there an feedback mechanism?

    • techtriks Says:

      Hi Seshu,
      Sorry for the delayed response .
      After testing the circuit on the breadboard, we have designed the PCB and assembled the circuit and it was working wonderfully. You should design the layout carefully. its better to make a separate PCB for the voice reco part and the power part(driver section).
      We have not implemented the breaking mechanism and feed mechanism due to lack of time. Speed control is switch selectable. there were 4 different speed settings done with PWM control
      We were using 12 (2 no.)volt AMRON maintenance free lead acid battery. Please see the photographs given in the gallery section. that time we could manage those big car batteries only. You may go for smaller one with required specs. All the specs are given in this webpage…

      All the best..
      NISHAMS

  98. rakesh r Says:

    hi nisha,
    which motor did u use?
    could u explain in detail about the driver circuit?…
    from where did u get the mic?

    • techtriks Says:

      Hi Rakesh,
      Here is the motor specifications
      Torque 10Nm
      Speed 60rpm
      120W
      24V

      We used MOSFET and relays for driving the motors. the circuit is similar to HBridge. But less no . of MOSFETs were used since the relay is used instead of ON/OFF .
      all the best,
      NISHAMS

      Mic we have purchased locally..from cochin. It will be easily available in any computer shop. get the best quality available. for testing we have used small button mic only. You can see the photographs in this webpage.

      All the best

  99. techtriks Says:

    Thank you Mr.Rob Miller
    Regards,
    NISHAMS

  100. prashanth Says:

    hey will you please forward the program of voice recognition circuit to my e-mail ?please yaar please…………..

    • techtriks Says:

      Hi Prasanth
      Its nice to hear that you people are interested in the project and doing well.
      However i would suggest all those who are interested in doing projects like this or any other projects to design and implement it by your own. Meantime if you face any problem, doubts etc,y you are all welcome to this forum. I strongly feel spoon feeding will kill the creativity..so request all of you to prepare things by your own rather looking for short cuts.Then if you face any problem write to me,if its within my reach i can very well help you out…
      best regards,
      NISHAMS

  101. AMAR N Says:

    Hi Im AMAR N,final year Engg student,i request u guys 2 mail me d entire synopsys of ur project,as im doing ma project on voice controlled car,plz help me out guys, mail me all d possible parameters of ur project including the program also plz

    • techtriks Says:

      Hi Amar,
      Its nice to hear that you people are interested in the project and doing well.
      However i would suggest all those who are interested in doing projects like this or any other projects to design and implement it by your own. Meantime if you face any problem, doubts etc,y you are all welcome to this forum. I strongly feel spoon feeding will kill the creativity..so request all of you to prepare things by your own rather looking for short cuts.Then if you face any problem write to me,if its within my reach i can very well help you out…
      best regards,
      NISHAMS

  102. jay Says:

    this is really very nice site…
    i want to do speech recognition for my project.For that i want to use HM2007.But the price of HM2007 ic is 3500/- at sunrom technologies and ajantha electronic shop,chennai.So if possible can you tell me the name of the shop at which this ic is available at 1200/- to 1400/-.

    • techtriks Says:

      Hi Jay,
      Good to hear you ppl are interested in the project. Please refer earlier interactions.I remember some students from Chennai itself had mentioned the name of a shop in richi street where u get HM2007in a better rate.But please note it was almost an year back..
      Allthe best,
      NISHAMS

  103. R.ARUNPRASAD Says:

    Hai friends
    I am also working in this type project nearly we finished half but we want to prepare the Report. So please send your full report to my id: arunpsg_2007@yahoo.com

    • techtriks Says:

      Hi Arun Prsad and team,
      Its nice to hear that you people are interested in the project and doing well.
      However i would suggest all those who are interested in doing projects like this or any other projects to design and implement it by your own. Meantime if you face any problem, doubts etc,y you are all welcome to this forum. I strongly feel spoon feeding will kill the creativity..so request all of you to prepare things by your own rather looking for short cuts.Then if you face any problem write to me,if its within my reach i can very well help you out…
      best regards,
      NISHAMS

      • R.Arunprasad Says:

        thank you for your reply sir,

        I get lot of noise while connecting a microphone(mic)to my voice recognition circuit than how can i reduce or cancel that noise….

  104. R.Arunprasad Says:

    please tell me the suggestion and reducing technique and the circuit…..

    • techtriks Says:

      Hi ArunPrasad,
      What kind of microphone you have been using? please verify the matching between the microphone and HM2007 mic input specs. Make sure that you follow exactly what they have been mentioning in HM 2007 datasheet..
      All the best,
      NISHAMS

  105. Mahesh Says:

    i would like to know about the availability of the IC hm2007? this is very urgent plz if any alternate is also available, feel free to reply.

    very same project.. only the ic is a problem not available anywhere..

    • techtriks Says:

      Hi Mahesh,
      We have procured it almost 3 years back..it was from US. However on last year some students could get it from Richi street,Chennai.
      Here is the details given by those students(the information is one year old):-

      HM2007 is available in the following shops at Ritchie street, chennai.
      1.ajantha electronics
      2.omega electronics
      3.textronics
      Besides these shopes you may try in other shops too, its heard that HM2007 esily available in Ritchie street.

      Cost is about Rs.1200-1400/-

      (Ritchie street is the electronic street in chennai)
      Root to Ritchie Street: Mount Road-Anna Statue- Opposite street to Batashop

      Thanks to Saranya and team from chennai for sharing this information. It will be highly helpful for so many local students..

      Best wishes,
      NISHAMS

  106. swapna Says:

    hey guys, all of u had done a gr8 job.. m really impressed by ur working style….

  107. swapna Says:

    hey..i really want to know any further improvement in dis project like wise somethng extra now a days happng.. something extra can i attach to this project??? rply its urgent……..

    • techtriks Says:

      Hi Swapna,
      Thanks for your message.
      Would you kindly let me know what are you doing and thoughts about up gradation on this project?
      Best regards,
      NISHAMS

  108. swapna Says:

    hiii
    thanx for ur reply..
    m dng masters in instrumentation nd control..
    i want to know more different devices which can be connected to this nd make it more useful than at present…

  109. rahul Says:

    hi i am rahul…here is my proj descrption..it send a signal through “FM Tx” to “FM Rx”..this must be given to HM2007 to train and recognize…as the functioning of HM2007 goes if there is a match O/p mem location is displayed….HERE IS MY PROBLEMMMM!!!!…HOW DO I CONNECT THE FM Rx to HM2007 mic input…should i just replace the mic with the o/p wires of “FM Rx”…what is the o/p of the Rx (is it electrical or analog i.e acoustic) if it is electrical can i directly give to “MIC IN” of my hm2007 ic….what should i do…please help me…i have 7 days left to submit my proj in college…plz plz plz help!!!!

  110. rahul Says:

    hi i am rahul…here is my proj descrption..it send a signal through “FM Tx” to “FM Rx”..this must be given to HM2007 to train and recognize…as the functioning of HM2007 goes if there is a match O/p mem location is displayed….HERE IS MY PROBLEMMMM!!!!…HOW DO I CONNECT THE FM Rx to HM2007 mic input…should i just replace the mic with the o/p wires of “FM Rx”…what is the o/p of the Rx (is it electrical or analog i.e acoustic) if it is electrical can i directly give to “MIC IN” of my hm2007 ic….what should i do…please help me…i have 7 days left to submit my proj in college…plz plz plz help!!!!!

  111. Zener Diode Says:

    “,` I am very thankful to this topic because it really gives up to date information ;`~

  112. Samatha Says:

    Hey i would like to know the cost of the permanent magnetic dc motors u used.. can u please let me know as early as possible

  113. kathercia Says:

    hi, gumagawa kasi kami ngayon ng prototype.. bale, improvised wheelchair din sya with voice recognition.. ahm, tanong ko lang.. baka naman pwede maisend nyo sa email ko yung pinakang soft copy ng thesis na nagawa nyo.. yung sa wheelchair din.. pls..

  114. kathercia Says:

    I am also an engineering student and currently working with the same topic. I would like to use your project as my reference(related works) but i need to improve something.

    can you send me more information about your project…

    i am hoping for your help…

    thanks!

  115. kathercia Says:

    I am also an engineering student and currently working with the same topic. I would like to use your project as my reference(related works) but i need to improve something.

    can you send me your soft copy of your thesis and more information about your project…

    i am hoping for your help…

    thanks!

  116. kathercia Says:

    I am also an engineering student and currently working with the same topic. I would like to use your project as my reference(related works) but i need to improve something.

    can you send me your soft copy of your thesis and more information about your project…

    i am hoping for your help…

    thank you..

  117. meryl sebastian Says:

    i was hoping whethr you would post the internal working of this HM2007 voice recogniton chip!! i’m doing a similar project using this chip but is unable to get any information about its working!!!!

  118. techtriks Says:

    Hi All,
    SORRY i was unable to respond to quite a few quires…..

    Will update the pages soon…

    Thanks and regards,
    NISHAMS

  119. Lavanya Mohan Says:

    HI

    This is really a wonderful project.

    I am currently in final year of an undergraduate course and have to do a project too. I came up with this idea and even submitted an abstract which my college accepted.

    I saw this site today and got a lot of valuable information to go about the project.

    The only problem that I am facing currently is that I and my team mates are from a software background. We have no knowledge of hardware. We are definitely keen on learning but there seems to be just too much in this project.

    I wanted to know whether it is possible for us to complete it within 6months. Completion includes learning the hardware mechanisms and then the implementation.

    Please do reply soon. And also tell us how much time it took you to finish this project.
    If you feel we wont be able to manage this project, please do let us know. We will think of some other ideas that have more software in them and submit them to our teacher before it is too late.

    Awaiting your reply.

    Thank you very much in advance.

    -Lavanya Mohan

    • techtriks Says:

      Hi, Sorry for the very delayed reply..

      Hope by now u might have started working on something…

      If you have some basic electronics background and , if you are passionate, i feel it is not very difficult to learn hardware..
      we have finished the project within 6 months time…

      Please feel free to write if you need some assistance, i will try to answer..

      Reagrds,
      NISHAMS

  120. jenin james Says:

    from which point shall we start the project??

  121. jenson07 Says:

    im doin a similar project.we designed the entire circuit but it just doesnt work.the HM2007 circuit doesnt give any reaction.we built the circuit exactly as it is in the schematic.could you pls let us know any connection or interfacing mistakes in the schematic of HM2007 with HM6264,74ls373,7448


  122. hey guys this is really good site and i myself had gained a lot of knowledge through this site ……….
    if u dont mind will u please send me any material if u have because even i am working on this or atleast give me u r contact number or email id as i am in urgent need of information related to this topic.

  123. Prashant Saraswat Says:

    heyyy i want help in this project…can u tell me how to program the pic and what is the coding part …and from where to take the motor connections for moving the wheelchair …plzz help asap

  124. kanya Says:

    what are the specifications of the dc motors u used in this project……..

    • techtriks Says:

      Hi Kanya,
      We have used two 60 watt/120rpm Permanent Magnet DC motor with gears (Designed and got it Manufactured ) for driving the wheels… However now i would suggest you to go for hub motors if you could source it..

      All the best,
      NISHAMS

  125. Sanya Says:

    Hey , could u send me the detailed report or any materials… am taking a seminar on this topic and it would have been a great help if you could…

  126. techtriks Says:

    Hi,

    I have answered clearly to these kinds of questions earlier. Still let me make it very clear for the last time…The primary aim of this webpage is to support/encourage students/people who are keen on doing something of their own. Also to share experience and ideas..But not for helping with sharing the complete project report, program code, circuit diagram etc…

    Best Wishes,
    NISHAMS

  127. Jai Bathija Says:

    Hey,
    Nice website.
    Well, I am working on a project.
    Needed some help.
    I’d be glad if anyone could help me out.
    I want the c equivalent code of something that I have on MATLAB.
    My email id is jaiomania@gmail.com

    Anywho willing, please reply back as in mail, we’d discuss the short bumper problem.

  128. ali khan Says:

    very nice project.
    I also want to make such a nice project.
    kindly help me.

  129. jenson07 Says:

    what is the microphone configuration u used…i am not able to train hm2007..the ready led is not blinking…its urgent

  130. BHASKAR Says:

    MANUVAL TESTBORD


  131. amazing peice would you link to my article please?

  132. jenson07 Says:

    finally we got our project successfuly…by Gods Grace….
    if anyone need help..contact on my e-mail
    hi4jens@gmail.com

  133. vishwanath Says:

    good project,…superb

  134. taps Says:

    hi! good evening. I am also working on the same project and i want to ask if wiper motors can be used on this and does it need gearbox? Thanks.

  135. Courtney Anthony Says:

    Its my pleasure to share my testimony with every One on This Sites, I have a testimony to share, My Name is Courtney Anthony, am from the United State of America, i am now 56 years old, a Medical doctor in Canada, I married for about 25 years ago without any child then me and my husband go for an adoption of 2 kids male/female. Last years something wonderful and gracious happened to me, i came across this Spiritual Prophet of the Lord on the internet that promise to help me get pregnant with his prayer, which i totally disagree… How can i be pregnant looking my age he ask me not to worry that with God all things are possible. That after the two days prayer has been completed, he told me what to do which i did, could you believe i miss my periodical time that same Month and i was pregnant. Today am now the happiest woman on Earth,, While am i testify to everyone on this site i know there are a lot of people that are in this kind of situation, some will decide to commit suicide. Please just do and contact the great Spiritual Prophet for help, make him to understand that Courtney Anthony from USA directed you, his email holyspiritualprophet@hotmail.com

  136. kavya Says:

    Hey ,
    my team has decided to work on voice controlled wheel chair .. and we need some suggestions on where we can find the hm2007 kit in and around mangalore ,karnataka.
    thank you .
    you can contact me : anushakr@yahoo.com


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