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

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