Touch Sensitive Switch

[Jerson]

Maybe using one of 'em Cypress PSoC capsense chips (if at all it uses a micro)??? I do remember long ago when I fixed a TV having a similar on/off touch switch.

[paul borgmeier]

Check Out (Mister E) Steve's Version as an option
http://www.picbasic.co.uk/forum/showthread.php?t=2671

[BobP]

Thanks for the replies. When the kids get fed up and forget about it I might find it and take it to bits.

I was impressed the way it senses the finger through the plastic.
Thought it might have been cheap and simple to use! Back to the clunky switches......

Thanks,
Bob

[mackrackit]

Look at the "LED Touch Sensor" and video at the bottom of the page.
http://web.ndak.net/jdgrotte/

[BobP]

Hi mackrackit,

Thanks for the post. It was not what I was looking at but its so unusual that I will have to try it!

Thanks for the post.
Bob

[mackrackit]

LEDs can be strange. The green ones can even produces a small voltage. Saw someone using them as a light sensor for a solar tracker.

The whole point is capacitance, not sure how the gizmo you are talking about works but I will bet the plastic is the di-electric and your finger is the positive side of the capacitor.??

Have you ever done the Leyden Jar experiment? Build a capacitor, charge it, take it apart with out discharging, completely separate the components, put it back together and it will still have a charge.

[rhino]

THIS might be similar to what Jerson is suggesting.