Simple IR Control RELAY SWITCH

An IR remote switch is a wireless device that uses infrared (IR) signals from a remote control to operate electrical appliances. Commonly used in home automation, lighting control, and fan regulation, it enhances convenience and efficiency with seamless wireless switching.

- RAJ K. GORKHALI

The system consists of an IR receiver module, a signal processing circuit, and a relay to control the connected load. When an IR signal is detected, the receiver processes it and triggers a flip-flop circuit, activating the relay to switch the device on or off. Any standard IR remote control, including those for televisions, CD players, or MP3 players, can be used. Fig. 1 shows the author's prototype.

Circuit and working

Fig. 2 illustrates the circuit diagram of the IR remote switch. The circuit is built around the TSOP1738 IR module (IR1), IC 4027 (IC1), two PNP BC558 transistors (T1, T2), a 5V SPDT relay, and a few passive components. The 16-pin IC 4027, a dual JK flip-flop, serves as the core of the circuit, with only one section used for this application.