Universal IR Switch Circuit Diagram – Build Your Own!

Description:

This is a single channel (on / off) universal switch that may be used with any Infra Red remote control that uses wavelengths between 850-950nm.

Circuit diagram

Notes:

Any "button" of any remote control may be used to work this universal switch. The button must be pressed for two seconds (determined by R3 and C2) before the relay will operate. Once operated the circuit will remain in this state (latched) until reset. To reset, any button is pressed and held for two seconds.

For example, if you were watching TV, and your set was tuned to Channel 3, you could press and hold the TV remote controls channel 3 button for two seconds. That way the TV viewing would not be affected and the relay would activate. You can connect anything to the relay, for example a lamp, but make sure that the relay contacts can handle the rated voltage and current.

Circuit Operation:

IC1 is an Infra Red module. IR modulated pulses are received and buffered by this IC. It has a standard TTL output, the output with no signal is logic 1. One gate of a CMOS inverter drives Red LED1 as a visible switching aid. Another gate buffers the signal and applies it to the time constant circuit, comprising R3,C2,R4 and D1. C2 charges via R3, and discharges via R4, D1 prevents quick discharge via the low output impedance of the CMOS buffer.

Integrated Circuit Details

IC1, designated as IR1, is an Infrared receiver module sourced from Harrison Electronics. This module is designed to detect and demodulate infrared signals. It functions as a receiver, converting the modulated infrared signal into a usable electrical signal. Its TTL output provides a standard logic level representation of the received signal, where a logic high (1) indicates no signal and a logic low (0) indicates an active infrared signal. This module provides a crucial component for the overall functionality of the universal switch.

Parts