See PCINT pin table at the bottom for more details. Arduino Uno/Nano/Mini: All pins are usable Arduino Mega: 10, 11, 12, 13, 50, 51, 52, 53, A8 (62), A9 (63), A10 (64 ...

The tutorial assumes you are at least familiar with C-lang-like language. It is not meant to teach anyone how to code in AVR/Arduino from scratch. It's more like a getting started for anyone who has ...