Comments on: Touch Sensing Building Blocks I

By: c.moore

c.moore — Tue, 14 Aug 2007 07:22:53 +0000

Sir, would it be ok if I replicated a summary of this process on my forums?

http://nuigroup.com/forums/

By: tmpvar

tmpvar — Sun, 31 Dec 2006 00:40:47 +0000

Excellent, excellent, and cool… I just tried the laser -> red led, and I had no idea. THE POWER OF THE LED :-P

By: justDIY

justDIY — Tue, 08 Aug 2006 11:54:52 +0000

to use the leds as binary sensors/switches, there are two ways … the first involves still using the ADC, along with accumulators in software … the second is to use the schmitt trigger inputs on the uC … the ST inputs are sensitive enough (high enough impedance?) to register the tiny tiny current an LED produces via the photovoltaic effect … so an LED thats being lit registers as a logic high, a dark led = low.

this makes it super easy, problem is, most pics have very few ST inputs, some models don’t have any…