The RFM12B is a great inexpensive option for wireless communication; itās an ISM band FSK transceiver module implemented with a unique PLL. These modules operate in the 915MHZ band and fully comply with FCC and ETSI regulations. This module has a wide voltage supply range of 2.2-3.8VDC. An SPI interface is used to send data and configure the RFM12 module. The configuration commands, described in the RF12 IC Datasheet linked below, can be used to set the data rate, frequency band, wake-up timer, transfer data, receive data from the 16-bit FIFO, and much more. The module comes in a 14-pin SMD package, with pins spaced by 2mm. Check below for a breakout board.Features:Low-cost, high-performanceSPI compatible interfaceHigh data rate (up to 115.2 kbps in digital mode)Wakeup timer2.2V-3.8V power supplyAnalog and digital RSSI outputsDifferential antenna inputAutomatic antenna tuning16-bit RX data FIFOPLL and zero IF technologyFast PLL lock timeHigh resolution PLL with 2.5KHz stepProgrammable TX frequency deviation (from 15 to 240 kHz)Programmable receiver bandwidth (from 67 to 400 kHz)Analog and digital signal strength indicatorInternal data filtering and clock recoveryClock and reset signal output for external MCU use10MHz crystal for PLL timingDimensions: 15.9 x 16.1 mm (0.626 x 0.634 in)Documents:DatasheetProgramming GuideRF12B IC DatasheetRFM12 Library for Atmel AVR uCās
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