2 red byer RFM12b HopeRF Transceiver 2012-03-14 RFM12B Transreceiver /obsolete/ RF Transceiver by Hope RF. Well supported Arduino libraries are available. Part is available in several frequencies (433MHz, 915MHz)... Clock output (no FIFO) / external filter cap

Clock output for external microcontroller

Reset output (active low)

Power ground

Antenna

Positive power supply

Power ground

Interrupt input (active low) / Valid data indicator

SPI data input

SPI clock input

Serial data output with bus hold

Chip select (active low)

Interrupts request output (active low)

Transmit FSK data input / Received data output