We all know, at least intellectually, that our computers are all built with lots of tiny transistors. But beyond that it’s a little hard to describe. They’re printed on a silicon wafer … ...

So it looks like, so long as forced input current is less than 1mA, AVRs can be connected to voltages higher than Vdd, and so an AVR like an ATmega328 could be used to monitor the existence of a ...