Connect up to 10 buttons using a single interrupt.
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It's not the debounce, the problem is that having one button pressed will stop the interrupt from being triggered at all. You can get around that by either doing the checking in the loop once you detect a press, or by putting a pin to INPUT once its button is pressed. Both options have flaws, through. In this case, pin change interrupts are probably the best. (See link in the introduction)
I did. I just show how to put the Arduino to sleep. I added a servo as a demo output.
Adding more buttons is just a question of connecting them to spare pins and adding them to the buttonPins array.
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