AVR Microcontroller. Wireless communication. RF433 FS1000A & XY-FST XY-MK-5V Modules Set and UART - YouTube
Wireless integrated circuit radio transmitter - ATA8 series - Atmel
Infrared Communications for Atmel Microcontrollers - Circuit Cellar
AVR Microcontroller. RF433 Wireless Temperature Sensor With LCD. Wireless Communication Between Temperature Sensor and Display : 5 Steps - Instructables