If you are using pushbuttons and don't quite have enough digital I/O, here's a little trick to free up a pin or two. +5V +_| -|_ PB1 + | \ / 20K \ / \_______________\ To AVR | \ / Input +_| / -|_ PB2 \ 150K + | / | …

Two Pushbuttons on One Input for More I/O

Gray_Malkin July 10, 2010, 11:24am 8

Lady Ada uses 5 buttons on her Monochron in a resistor ladder, I believe. I'll check the schematic.

Topic		Replies	Views
Reading the status of a digital pin Project Guidance	5	1300	May 5, 2021
False INPUT_PULLUP values Programming Questions	21	3202	May 5, 2021
Read Multiple Inputs Project Guidance	4	9983	May 5, 2021
If (pin == low) Project Guidance	5	2898	May 5, 2021
Arduino Button - ground (HIGH then LOW) General Electronics	4	1388	May 6, 2021