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Vibration Sensors or switches? — Parallax Forums

Vibration Sensors or switches?

TonyATonyA Posts: 226
edited 2005-09-08 05:45 in General Discussion
Hi,

I am looking for vibration sensors, or switches that I can use the attach to guitar strings. When guitar string is plucked ---> activates the switch.

Can anyone offer references for a source?

Thank you,
Tony

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-09-05 16:21
    Tony,

    ·· You're in luck!· We have such as sensor located at the following web page.· If you have any questions on them, just ask.· I've used them myself and tested various properties of them.

    http://www.parallax.com/detail.asp?product_id=605-00004

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • Oper8r AlOper8r Al Posts: 98
    edited 2005-09-06 05:54
    Chris,
    ····· I would also be interested in ways to attach them to guitar strings and activate a switch. I would like to be able to use the string vibrations as triggers but didn't want anything actually touching the string, and killing the sound. If you have any suggestions it would be much appreciated. I think that this may be something I could actually accomplish with my level of understanding unlike some of my other ideas. Thanks for any help.

    Al
  • StarManStarMan Posts: 306
    edited 2005-09-06 06:12
    You could use a regular electric guitar pickup.··· You would need to do some testing to find out what current levels are created when a string is plucked.·· It will only work with steel strings.

    Chris I.
  • Paul BakerPaul Baker Posts: 6,351
    edited 2005-09-06 12:27
    http://www.blueguitar.org/new/misc/gaussmeter!.pdf

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    ·1+1=10
  • steve_bsteve_b Posts: 1,563
    edited 2005-09-06 13:19
    if you wanted to get creative, you could put a microphone in the guitar (unless it already has one) and filter out unwanted frequencies.

    But certainly using a standard single coil guitar pickup will be the easiest.

    There are some 'tuners', specifically for acoustic guitars, that will clamp to the head and when you pluck a string, it senses the vibration and indicates the note.· Neat little things!





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    ·

    Steve

    "Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-09-06 14:49
    Al,

    ·· While the vibra tab is capable of picking up slight vibrations from the strings without contact, that would put you in the position of not be able to easily detect which string is vibrating.· It would require considerable calibration to do that, but I guess it could be done.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2005-09-07 16:37
    The older guitar pick-ups use electromagnetic induction. If you were to have six separate coils in a format similar to a Fender or Humbucking pickup, each could go to an amplifing device [noparse][[/noparse]transistor, audio Ic or op-amp] and then into whatever.

    Some guitars are configured for mutiple pickups, so you could remove a pickup and put your unit in the hole as a replacement. Positioning would be optimal.

    If it is digital you want, I suppose and op-amp and an schmit trigger would be in the mix.

    So, the trick to to wind your own coils on a soft iron core with appropriate insulation.

    This is established technology since the 50s. Anything man-made can be made by any man. It is the invention of new things that is hard.

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    G. Herzog in Taiwan
  • ManuelManuel Posts: 105
    edited 2005-09-08 05:45
    Im using the 3515 hall effect sensor, it was quiet dificult for me to get it attached to the BS2sx. I used a NAND chip to read 0s and 1s. i dont recomend it though...

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    Best Regards

    Manuel C. Reinhard
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