Shop OBEX P1 Docs P2 Docs Learn Events
Very simple touch switch? — Parallax Forums

Very simple touch switch?

TonyATonyA Posts: 226
edited 2006-03-24 02:44 in BASIC Stamp
Just wondering if anyone can offer their opinions about whether or not this could work with the BS2.
It's a very simple touch switch based on capacitivity.


Schematic and info here:
http://www.bytecraft.com/touchsw.html

When I saw this I wondered if that's what the small 6 pin qprox chip was, just a pic programmed to read small changes in capacitance?

Anyway, I was wondering the same thing could be utilized with the BS2. Where you can just read the change in capacitance caused by touch directly from an I/O pin.

Tony

Post Edited (TonyA) : 3/22/2006 3:14:02 PM GMT

Comments

  • BeanBean Posts: 8,129
    edited 2006-03-22 15:14
    Try using the touch plate as the capacitor with RCTIME.
    Bean.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "SX-Video·Module"·available from Parallax for only $28.95 http://www.parallax.com/detail.asp?product_id=30012

    "SX-Video OSD module"·available from Parallax for only·$49.95 http://www.parallax.com/detail.asp?product_id=30015
    Product web site: www.sxvm.com

    Coming soon... Cheap 4-digit LED display with driver IC·www.hc4led.com

    "Sometimes it is better to remain silent and be thought a fool, than to speak and remove all doubt."
    ·
  • TonyATonyA Posts: 226
    edited 2006-03-22 15:43
    I noticed it worked with a Pic using analog to digital conversion, it was actually extremely sensitive. I was worried about trying it on my stamp but I think that would work just as well.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-03-22 15:53
    You could also try the QT113.· A link is provided below.

    http://www.parallax.com/detail.asp?product_id=604-00038

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • Bruce BatesBruce Bates Posts: 3,045
    edited 2006-03-22 17:31
    Tony -

    From an electrical point of view, and just as a general matter, almost anything you can do with or to a PIC microcontroller safely, can also be done with or to a PBASIC Stamp microcontroller equally safely. There are some exceptions, as not all Stamps are PIC based, and those that are not, are based on the Ubicom SX processors. It would be wholly unfair in this regard to make any exact comparison between a PIC based microcontroller, and a Ubicom based microcontroller. However, electrically, they are quite similar, and similar precautions and latitudes apply to both.

    Obviously, the bottom line for any electrical or electronic device is the manufacturer's or provider's data sheet or specification sheet. If you follow those guidelines, you really can't go wrong. POOF <oops> smile.gif

    Regards,

    Bruce Bates

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    <!--StartFragment -->
  • TonyATonyA Posts: 226
    edited 2006-03-22 21:55
    Thanks for the info. I was a little worried to try on the stamp. There's no 220 ohm resistor before the pin.

    I thought maybe this would be a good way to utilize touch sensing without the need for an extra chip.

    Thanks,
    Tony
  • A.C. fishingA.C. fishing Posts: 262
    edited 2006-03-23 21:36
    Chris Savage (Parallax) said...
    You could also try the QT113.· A link is provided below.
    I'm confused. isn't that discontinued?
    ·
  • OrionOrion Posts: 236
    edited 2006-03-24 02:21
    If they don't carry it anymore check out the QT160, identical but with 6 buttons on 1 IC.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-03-24 02:44
    We should be getting it in again soon.· We were unable to get the part until someone on the forums let us know the Lead-Free version was now available.· So we should have it in again real soon.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
Sign In or Register to comment.