Electronics Touch Sensitive switches?

Discussion in 'Modding' started by CryoTeK, 30 Jul 2002.

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  1. NiHiLiST

    NiHiLiST New-born car whore

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    The 555 chips are timers. I don't see how they could be used as touch sensitive ICs to be honest.
     
    NiHiLiST, 15 Sep 2002
    #41
  2. cpemma

    cpemma Ecky thump

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    I don't know about the normal 555, but I'll bet the low-power cmos 555s will trigger from a touch in the right place. Looks like the kit BorgBob has uses cmos chips, many can be arranged to trigger from the body acting as an aerial (like when you touch an amplifier input) or as a conductor.

    Problem with the aerial approach is stopping lightning or the fridge thermostat being picked up :eeek:
     
    cpemma, 15 Sep 2002
    #42
  3. macroman

    macroman The One

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    The 555 can be used. It's trigger input is high impedance and can be used to trigger a fixed length pulse.

    The down side is it can be triggered by random pick up unless some care is taken with the design. The beauty of the purpose made chips is they self calibrate and hence do not suffer from random triggering.
     
    macroman, 15 Sep 2002
    #43
  4. Phrozenpenguin

    Phrozenpenguin What's a Dremel?

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    Cheers Macro, knew it would be possible somehow :)
     
    Phrozenpenguin, 16 Sep 2002
    #44
  5. NiHiLiST

    NiHiLiST New-born car whore

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    Kewl :) Proved me wrong, I just started A level electronics at college btw, so I'm pretty dumb on it still so far.
     
    NiHiLiST, 16 Sep 2002
    #45
  6. Digitalblueshift

    Digitalblueshift What's a Dremel?

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    From borg bobs, site ^^^

    Do you think, Borgbob, that you could use a small ovoloid of metalized tint as your prox plate, nestled directly underneath your ovoloid lcars button. Does anybody think that the metalized tint would be enough to act as a prox plate? It would still light up, just slightly dimmer than the rest of the panel.

    Yeah the ramsey kit looks like a good deal, might put my heard earned bones to it, Ive got a little new progect of mine to do, and its a whole lot eaiser than a cube comp...
     
    Digitalblueshift, 26 Oct 2002
    #46
  7. Bogomip

    Bogomip ... Yo Momma

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    so a proxyplate is just like the sensoring part of the sensor ??
     
    Bogomip, 27 Oct 2002
    #47
  8. Bogomip

    Bogomip ... Yo Momma

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    oh oh, me too :D

    are you doing AS electroncics then ? they dont teach us PCBs in it :( which i was rather upset about :-/
     
    Bogomip, 27 Oct 2002
    #48
  9. Phrozenpenguin

    Phrozenpenguin What's a Dremel?

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    They dont teach about PCB's @ AS? They do @ GCSE
     
    Phrozenpenguin, 27 Oct 2002
    #49
  10. NiHiLiST

    NiHiLiST New-born car whore

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    Yep and yep! I did systems and control at GCSE which is electronics and mechanisms essentially. But electronics at AS and A level is more theoretical. At GCSE (for us at least) we didn't REALLY learn much of the theory behind how stuff like 555 timers worked, but at AS you do, and you do a lot of work on logic. Flip-flops and multiplexing and stuff :)
     
    NiHiLiST, 27 Oct 2002
    #50
  11. Phrozenpenguin

    Phrozenpenguin What's a Dremel?

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    Ok thanks.
     
    Phrozenpenguin, 27 Oct 2002
    #51
  12. aurazes

    aurazes What's a Dremel?

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    those dentist lights work when they jus put their finger over it... its like a sensor...
     
    aurazes, 28 Oct 2002
    #52
  13. viridius

    viridius What's a Dremel?

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    I'm using the QT-115s in my baybus. There's a movie of half the circuit in action here. My problem is that the sensors lock up after a minute or two and I have to reset the power to get them to work again. The website said that it might happen, but does anyone have any advice on reducing this?
     
    viridius, 29 Oct 2002
    #53
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