Projeto 81 - Ligar e desligar um led por manipulação direta de portas do Arduino - Squids Arduino
Arduino Port Manipulation (Registers Access) Tutorial & Examples
Arduino compatible $39 SBC runs Linux on x86
Les ports ARDUINO: gérer un feu tricolore
Arduino DDR and PORT register to control multiple digital outputs! - YouTube
I've built a diy PIU dance pad (similar to DDR) with LED lighting, all controlled with an Arduino Leonardo acting as a HID game controller : r/ arduino