Using Infrared for Hardware Control

This write-up is a practical tutorial on capturing and replaying infrared remote signals and using them for hardware control: it explains common IR protocols (NEC, SIRC, RC5/RC6), shows how to configure a Raspberry Pi with ir-keytable to receive/transmit IR codes, and provides an Arduino Mega2560 sketch to toggle a 4-channel relay module based on received IR commands. The article includes sample commands, wiring notes, and captured code examples, and also cites research demonstrating IR-based covert exfiltration on air-gapped systems.