This is really cool remote control project that uses two communication links – IR and RF. The whole project consist of three main parts as separate boards: 4/8 channel RF transmitter, 4/8 channel IR transmitter and 4/8 channel IR/RF receiver.
Each of transmitters have 8 buttons. Transmitters can act as 8 channel transmitter for sending simple codes or four channel transmitter for sending ON and OFF command with button pairs. The receiver module has 8 relays. Receiver module can be equipped only with RF or IR module- base circuit is same. I wander why not to use both receivers and make it more universal… Source codes for PIC microcontrollers for all transceiver variations are available for download and can be compiled with MPLAB.