Okay skimask,

I'll try to explain clearly what I'm doing - or trying to achieve.

I have three 7seg-LEDs (three "digits") connected to a 16F88 @ 20MHz and I want them to act as buttons as well.

These three 7seg-LEDs display random numbers whithout any decimal point so I use this Dot-Point as the sensor for each 7seg-display.

I couldn't find exactly in your code how you compensated the effect of the surrouding luminosity but you have surely noticed that, in a dark environment, the discharge time of the LEDs raises drastically.

Thus, the "scanning time" until the "darkest" (or "pressed") LED is detected can be quite long. In my experience, it can take over a second.

My idea is to compensate the surrounding darkness by dropping the LED's Dot-Point voltage and hence, reduce the charging/discharging cycle.

Currently, for testing, I'm working with three digits but my final project would have ten digits (key-pad) so the time to analyse which button is pressed is important.

Voilą. Hope this helps for understanding...

It's far too amazing so I can't give-up now; got the same kick as you