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Thread: Help with the OpenFES Project

  1. #21
    Senior Member mattblan's Avatar
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    Few updates:

    I put up a flicker page here with a few photos of the dev board, power supply, and embedded system. The single channel FES proof of concept is very close to being complete. We just need to drop in a missing IC and solder a capacitor and we will be ready to turn it on. I have decided to ditch the chain driven system on the Powertrainer for a couple of electic motors. Using these motors, we can adjust resistance, detect user torque, and even passively pedal the bike if neccessary. We are sizing up the bike tomorrow to see exactly which motors we want to go with.

    On the system level, I have been trying like crazy to get the OpenFES Linux distribution compiled. I thought I had solved all of the issues last night, but I woke up to a broken build. I started the build again on my laptop, only to have the partition run out of space. When I get it done, I will upload it to the at91sam9261 development board and set to work on data aquisition and control.

    Here is the dev board as of 1-5-09. It's just a proof of concept, so the controls are analog (the giant potentiometers you see). Once we prove it works, we will replace the analog pots with digital, add serial communication and a few other goodies, then send it off to be fabricated.


    Last edited by mattblan; 01-06-2009 at 04:06 AM. Reason: added photo of the dev board

  2. #22
    Nice job Matt, its good to get the first one built!

    I will post a picture of the circuit I have working, good to see its not just mine that looks a little cluttered!!

    BR

  3. #23
    For those interested in pictures of wires and stuff!!

    Power supply. USB interface and Stim Channels 1-3 (lots of wires!!)




    Stim Channels 4-6


    Last edited by bikeracer; 01-07-2009 at 08:25 AM.

  4. #24
    Senior Member mattblan's Avatar
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    Updates 3/2/09:

    -Wiki has moved to http://www.openfes.org
    -Microcontroller Schematics are being uploaded.
    -FES Unit Schematic is being finalized.
    -CPLD's for FES Control Logic are arriving this week.
    -User Interface Shell is completed.
    -Optical Encoder (to determine crank cangle, RPM, etc) is being ordered this week.

    The first project presentations will be held middle of May. All Video and Documentation will be available on the website shortly thereafter.

    Matt
    Last edited by mattblan; 03-03-2009 at 02:58 AM. Reason: Added a less confusing redirect

  5. #25
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    I'm a C7 quad. I live in Northern Ca and a Sac State Grad. Just recently injured February 17, 09. I am interested in talking to you about your machine. Can you email me? edqman@yahoo.com. Thanks

  6. #26
    Senior Member mattblan's Avatar
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    Email sent, looks like we are neighbors =)

    We finished our initial Bandit prototype and we will be giving a presentation Tuesday night at CSU Sacramento. Video will be posted shortly after and we will be updating our wiki with more details.

    Basically here's what we accomplished so far:

    1. Designed a PCB single channel TENS Circuit with digitally controllable pulse width and current amplitude while providing feedback of actual current amplitude attained.

    2. Mounted a rotary encoder to a passive upper/lower body trainer (SciFit) to obtain crank angle and calculate RPM.

    3. Designed an algorithm that takes current RPM and sends firing commands to 6 TENS circuits to maintain angular velocity.

    4. Designed a simple socket graph that displays current RPM against the pulse count for each muscle group in real time.

    Matt

  7. #27
    I too, would be interested in trying your machine. I'm a C5 quad that is fairly knowledgable in FES
    www.kevinjmullin.com
    that is me

    you can email me at kjmullin@yahoo.com

    thanks,
    Kevin

  8. #28
    Senior Member mattblan's Avatar
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    Thanks Kevin. I really liked your site and I sent you an email. For everyone else, Summer is here again and there are many talented people who may be coming up on some free time. If you are looking for a worthwhile cause, why not donate your expertise to the OpenFES project?? =)

    We completed our prototype FES cycle and we are looking to make a bunch of improvements in the coming months. In the winter, our major engineering tasks will be adding two DC motors, shrinking and fabricating our digitally controlled 8-channel TENS unit, and enhancing the user interface.

    A separate engineering team has plans to incorporate brain machine interface (BMI) technology to provide a rider neuro control of the TENS unit while competing in a simulated racing environment. In other words, they want to use brain feedback to pedal the bike instead of letting the computer algorithm do all the work.

    If anyone is interested in Google Android, I plan on redesigning the OS using the Android SDK over the Summer and I would love to get a few Java guys on the UI team!

    I will update openfes.googlecode.com as soon as I can so that everyone can see exactly what we have, where we are going, and how exactly we plan to get there. Feel free to leave comments on the site.

    Regards,

    Matt

  9. #29
    hi matt,
    i know your no longer interested in fes rowing i'm and currently taking part in a f.e.s rowing trial in the u.k. if its any interest i can put you in touch with the guy leading the project or if you need any other info i'd be happy to help.

  10. #30
    Quote Originally Posted by mattblan View Post

    If anyone is interested in Google Android, I plan on redesigning the OS using the Android SDK over the Summer and I would love to get a few Java guys on the UI team!
    Regards,

    Matt

    Interested in helping, am a java coder and embedded systems know how.

    http://developer.apple.com/ipod/apply.html

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