How would you do this?

[ERMEGM]

I'm looking at 4 inputs though. Two for a positive trigger and two for a negative trigger.

My thought was to pull the positive ones low and the negative ones high to give a distinct change.

[Charles Linquis]

I give up.

[ERMEGM]

Here are two circuits I've put together. One is a voltage divider and the other is an optocoupler setup. The positive inputs on the VD setup has a cap and zener for debouncing and has pulldown resistors. The negative inputs have a pullup resistor. The VD setup allows for only one input to trigger a new routine. The opto setup requires the LED circuit to be completed in order to trigger a new routine, so the setup has to work as a pair instead of individually.

In this case, is the VD setup the better setup to use? Disregard the resistor values and they were just thrown in there.

Thanks,
Tony

[amgen]

Charles,
Good point about clamp ability in pins (a few pins don't have that clamp diode), but why are you using such low val resisters ? Voltage dividers with 50, 100-200K value resisters make any voltage/power dissipation insignificant. I tried a touch sensor to a/d pin through a 10 MEG ohm R (and diode) which instantly brought a/d val to full, (5 volt).
Don