433MHz Wireless RF Relay Switch

The 433MHz Wireless RF Relay Switch system operates by bridging a manual user input with wireless electromagnetic communication to actuate an electromechanical load. At the transmitting end, the circuit features a push-to-on switch connected alongside a 1k resistor, which serves to complete a trigger circuit when pressed. This action powers the 433MHz RF Transmitter module, modulating a radio frequency carrier wave to broadcast a wireless signal through its antenna. On the receiving end, the paired 433MHz RF Receiver module listens continuously for this specific frequency. When the incoming radio waves are detected, the receiver decodes the signal and outputs a control voltage. Because the raw output current from a standard receiver module is typically insufficient to directly drive a heavy inductive load, this signal interfaces with a Single Pole Double Throw (SPDT) 5V Relay. The relay acts as an electrically operated switch: the incoming receiver signal energizes the relay's internal electromagnetic coil, causing its mechanical contacts to physically switch states. This action allows the user to open or close an external circuit path remotely without needing a physical wired connection between the transmitter and the relay switch.