IR remote control circuit diagram

The here circuit is for a single channel Infrared remote controller which can be used to control home appliances and devices.

The IR remote controller consists of a receiver circuit similar to a latching switch circuit using IC 4017 and a transmitter circuit using a 555 IC.

IR Receiver circuit

The receiver circuit is similar to a latching switch which ON and OFF the output alternatively for each triggering. Here the circuit arranged to toggle the output for each positive triggering at the clock input of the decade counter IC.

Refer: ON OFF Latching switch circuit using IC 4017

Whenever the infrared ray falls on the IR diode a voltage drop obtains across the resistor R1. It provides a positive edge at the clock input which toggles the output state. During each flash, the output just switches its previous state to an opposite present state. If the previous state was OFF then switches to ON else if it was an ON state then to OFF state.

IR Remote circuit

The IR remote consist of a one-shot pulse or monostable multivibrator using a 555 IC which have an ON-time period less than a second. An IR LED using a simple supply and a push-switch can act as an IR remote and it is enough to operate the receiver circuit as the circuit toggles only for the edge triggering. But the circuit is to flash the IR LED for only a fraction of a second to avoid false counting due to the motion of the hand or any improper passing, that might generate multiple pulses. Thus the circuit flashes only for a fraction of a second even for a prolonged press of push switch.

Components required

Receiver

IC1 – 4017

Resistor – R1 – 560, R2 – 10k, R3 – 1K

Transistor – Q1 – BC547

Diode – D1 – 1N4007

IR receiver diode

Relay – SPST 12V, 200ohms

Remote

IC1 -NE555

Resistor – R1 – 1k, R2 – 560

Capacitor- C1 – 100uf, C2 – 33pf, C3 – 100nf

Diode

IR LED

Push Switch