Infrared (IR) Remote Control Relay Module using TSOP1738 & CD4017

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IR (Infrared) Remote Control Switch Circuit is a cost-effective solution for home appliances in our fast-paced life. As a result, much importance has been given to this aspect and a range of remote controls are prevalent today. One of the most frequent is that which makes use of IR radiations at particular frequencies for operations. So In this tutorial, we are going to make an “Infrared IR Remote Control Relay Module” by using TSOP1713 & CD4017 Decade Counter IC.

This circuit is a Remote Operated Home Appliance or Remote controlled Home appliance. The circuit is connected to any of the home appliances (lamp, fan, radio, etc) to make the appliance turn on/off from a TV, VCD, VCR, Air Conditioner, or DVD remote control. The circuit can be activated from up to 8 meters. It is very easy to build and can be assembled on a normal prototype PCB.

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5$ PCB Prototype

Hardware Components

The following components are required to make IR Remote Control Circuit

S. No	Component	Value	Qty
1.	IC	CD4017	1
2.	Relay	5v	1
3.	IR Remote Control	TSOP1738	1
4.	Transistor	BC547, BC557	1
5.	Battery	9v	1
6.	Diode	1n4007	1
7.	Resistors	220, 1k, 10k, 100k	1
8.	Electrolytic Capacitor	1uf	1
9.	LED		1

CD4017 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of CD4017

IR Remote Control Circuit

Working Explanation

The 38 kHz IR rays generated by the IR remote control are received by the IR receiver module TSOP 1738 of the circuit. Pin1 of TSOP1738 goes to the ground, pin2 goes to the power supply and the output is available at pin3 through 10k resistor R1. The output signal is amplified by transistor Q1 (BC557). The amplified signal is given to clock pin 14 of decade counter IC CD4017 (IC1). Pin8 of IC goes to the ground supply, pin 16 goes to the Vcc supply.

The output of IC1 is taken from its pin2 of IC. A Red LED connected to pin2 is used to indicate the ‘on’ state of the appliance. Transistor Q2 (BC547) base connected to pin2 of IC1 which drives the relay and acts as a switching mechanism. The appliance to be controlled is connected to the pole of the relay and the neutral terminal of the mains. It gets connected to the live terminal of AC mains via normally opened (N/O) contact when the relay gets input. As the result, we get a relay toggling on each press on the remote. Any appliance connected to this circuit can be switched ON or OFF.