[Sebastian]

Yes, thats the theory. But I'm asking because I'm not shure if this is also true for most new engines. For example, I know a diesel engine (direct injection) that injects a smal amount of fuel at the beginning and the main part a short time later. Or, my motorcycle has no camshaft sensor so it can not differentiate between top dead center of compression and gas exchange -> it injects every revolition, but ~1/2 amount of needed fuel.

I think, if the diesel example is not usual in other engines it should work. I will give it a try..

Edit: dcb, yes I found the PCINT today. As I read they trigger always on SWITCH (but this would be ok I think). But for standby wake up ATMega only acepts INT0 or 1 on LOW.. I'm not shure what interrupts I need at the moment. I have one prototype MPGuino for testing (finished but untested) and thinking about the final one (a general on-board computer for motorcycle with grapical touch screen).