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Ok I tried it and I was totally wrong, it weirds out completely Thanks for bringing that up scsirob, I think my confusion came from other times when I was testing on a logic board but of course then it would be grounded or 1 input, not floating.
Ok, it is now built. Working just great, I would make a couple of revisions for the next one I build (probably do a couple for friends). The only change was swapping the 4.7 Zener which regulated VCC for a 7805. The AVR just wasn't enough to take the full load from the zener and it was getting too hot. The 7805 in this circuit doesn't even get warm to the touch. With the AVR in sleep mode I can't even get a reading on my ammeter.
Hence my original suggestion of a pull down on the ignition line. I would be most surprised if the device has internal pulldowns, most don't.
Thanks for bringing that up scsirob, I think my confusion came from other times when I was testing on a logic board but of course then it would be grounded or 1 input, not floating.
Linear Mode
