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Wireless accelerometer project

[Jerome Demers] sent us his extremely detailed semester project. The two part system consists of PICs connected to XBee modules and accelerometers. By using the device a coach can monitor an athlete and correct their minute mistakes.

Did we mention [Jerome] was very detailed? He also goes into the particulars of designing the circuit, using solder paste and baking, designing and laser cutting a case, and even some fun stories. Well worth the read if you have the time.

Comments

  1. Did we not have the wiimote?

  2. Elias says:

    I’m curious how the vias were plated on an engraved board.

    I have my own CNC so this would be very useful info if it is done easily.

  3. greycode says:

    Golf clap. This is a very professional looking job.

  4. Sp`ange says:

    I may be incorrect, but doesn’t the xbee have great range than bluetooth?

  5. hey guys!

    the plating for vias is a very complex procedure. It takes about 3 hours to do machining and plating.

    how it works is easy, he drill all the holes first without any engraving. He then remove the board and goes into a bath to get the holes electrolysis (or something), they et plated. He rince the board,(I am probably missing some steps) put it back in the CNC and get the rest of the job done. The technician (Serge) told me that the first time he did that, he plated the hole at the end, when the board was all engraved.All the trace where cover with the plating, making this big short circuit.

    Yes, the Xbee has greater range then bluetooth. There are some bluetooth out there that do have some very good range. 50 meter is enough. With bluetooth, you don’t need a external receiver because a lot of computers these day have bluetooth. Also during my bluetooth test, I lost data while moving fast.

  6. Alpay Kasal says:

    really pretty looking job. great work… i had a similar project, but the wiring was so wild I wondered if i’d get held at the airport by homeland security… and yes, i missed my flight – but only because the object was considered a “blunt object” and they didn’t care about the wiring job :)

    http://hackaday.com/2009/11/25/digital-bmxing-through-san-francisco/

    using arduino’s and xbees. one set in the bmx handlebars, and one set in a radio shack project box connected to a pc.

  7. Twred says:

    So detailed that he spelled ‘Analyzer’ wrong?
    huh?

  8. Pilotgeek says:

    *cough* wiimote…

  9. brian4120 says:

    Every project that involves accelerometers does not require a wiimote folks! Besides as this was a school project I think the point was to do it from scratch

  10. km says:

    @Twred: er, no?

  11. @Twred
    “So detailed that he spelled ‘Analyzer’ wrong?”

    HAHAHAHA! good find! I am french btw but that is not a excuse.

    I guest I should contact you for proof reading :P
    That is not the first little mistake I made. My boss did not even check it when I ask him to laser cut. yeah, I will blame it on my boss! LOL

    Thanks again! I do try my best to remove mistake in my blog. I will work harder next time.

  12. @Twred
    I just check in my dictionnary and “Analyser” to analyse.

    1 point for the french guy!

  13. Pilotgeek says:

    #2brian4120: But Wiimotes make it so much easierrrr…. and they’re cheap to boot. And wireless. Why not use them?

  14. @Pilotgeek

    I agree, but it is way too big to fit on a pole vault runnner! It has to be pager size and light.

  15. charliex says:

    @elias i use LPKF rivets for via, the downsize is 31mil min drill size. They also have a conductive paste that you spread over the board and cure.

    Thnk n tinker, also have a pretty good write up on electroplating
    http://www.thinktink.com/stack/volumes/volvi/condink.htm

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