Two AVR microcontrollers are found on the AVRRAVEN module. An ATmega1284P is connected to the AT86RF230 radio transceiver, and an ATmega3290P is driving the LCD. Both these devices are selected from the AVR picoPower family, something that ensures minimal power consumption and operation down to 1.8 Volts. Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) is used as an inter processor communication bus.