4 Channel 315Mhz RF Remote Transmitter – Arduino Compatible
This is a 4 channel RF Transmitter unit that consists of an Atmega328 microcontroller, 4 x tactile switches with pull-down resistors, programming port, and 315Mhz RF transmitter module. It is Arduino compatible open-source project that can be used for many RF transmitter applications. It is advisable to use a 30cm hook-up wire as an antenna to enjoy a maximum range of the transmitter.
4 Channel 315Mhz RF Remote Transmitter – Arduino Compatible – [Link]