I am working on a project using ATmega328 that requires waking up from sleep mode using button presses. Several articles explain how to do that by connecting the button to the interrupt line INT0 or INT1. However I have 4 SPST buttons but only 2 interrupt lines. Each button needs to be able to wake…

Wake up from 4 different buttons.

jremington November 21, 2017, 3:53pm 4

Every digital input can cause a pin change interrupt.

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