I've researched how to attach multiple buttons to a single analog input using a resistor network. Instructables has a good lesson on this: http://www.instructables.com/id/How-to-access-5-buttons-through-1-Arduino-input/?ALLSTEPS
My requirement is that I need to attach an interrupt to buttons (ie the analog input) before reading the analog value, so that all the buttons can act as a trigger.
This works for voltages in the higher range, but not in the lower range (the trigger input waits for a RISING edge).
Can any one suggest a circuit that steps a >0V+ to +5V input to a +5V output so that any button push would trigger the input?
Otherwise, does anyone have other suggestions on how to use triggers for each button?