One of Atmel’s smallest microcontrollers, the ATtiny, is among the most inexpensive and reliable chips around for small applications. It’s also one of the most popular. If you don’t need ...

[Mic] then tuned to the internal oscillator of his ATtiny microcontroller with this ... is implemented by feeding the mains into an AC optocoupler. [Mic] discovered that the optocoupler diodes ...