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As with many of my projects, this one deserves more of a write-up than I have time to give it right now. I wanted to get it up on GitHub so that anyone else looking for an example of using the timer interrupts / ISRs on the ATtiny461 can find it.

The algorithm is basically:

• If the power is off, turn it on when the button is pressed.
• If the power is on, don’t turn off on a single press.
• If the power is on and the button is held for 6 seconds, turn the power off.
• If the button is held after the power has been turned off, don’t turn on until it’s released first.

Hopefully the code is commented enough to be useful: set up the prescaler and the ports, then enable interrupts and do everything else in the ISR.

The Makefile is from Markus Conrad’s project, and was invaluable for getting things up and running. I used a BusPirate for programming, though I’ve gotten a real AVR programmer in the mean time, so I’d like to revisit and finish this.