Remote Control Projects Using IR and RF

Two communication links consisting of IR and RF are being used by this remote control which is subdivided into three parts as separate boards including RF transmitter, IR transmitter, and IR/RF transmitter.

There are 8 buttons on each of the transmitters which can act as 8-channel transmitter capable of sending simple codes or 4-channel transmitter capable of sending ON and OFF command with button pairs. The receiver module can be equipped only with RF or IR module-base circuit and contains 8 relays in order to control 8 devices where each device can be configured to be momentary or latched. Latched outputs can be toggled ON/OFF by one button per channel or turned ON and OFF by two buttons per channel.

The circuit is very flexible since it contains a PIC microcontroller. The Manchester-coded transmitter output is well suited for the cheapest ASK radio modules of for infrared control and the units are configurable to a unique address, which must match to control the devices. For infrared version, an IR LED matching the wavelength of the receiver module should be chosen. The transmitter modulation frequency should match the receiver center frequency through settings.

Rest of the project