IR Remote Control Light Switch

We can use any IR Remote control to turn ON or OFF home appliances by using IR Remote control light switch circuit. In this circuit IR Receiver TSOP 1738 used or you can use TSOP 1736 also, these IR sensor are capable of Receiving 36 KHz to 38 KHz IR signals from any Remote control.

Output from the IR sensor taken to timer circuit and counter stage then Relay to control light bulb or any other electrical appliances.

Circuit Diagram

Components Required

  1. TSOP 1738
  2. IC 7805
  3. IC 555
  4. IC 4017
  5. 9V Relay
  6. Transistor BC547
  7. Diode 1N4007
  8. Resistor 100KΩ = 2, 330Ω
  9. Capacitor 0.01μF = 2, 10μF
  10. Battery 9V

Construction & Working

This circuit receives any IR (Infra Red) signals from Remote Control and makes turn ON and turn OFF electrical appliances, here we taken a electrical bulb as a target and connected it in Relay as between common and Normally Open (N/O) terminals of Relay, and this Relay gets power supply from 9 Volt battery.

IC LM7805 Regulator IC provides regulated 5V DC supply to IR sensor, timer and counter IC. TSOP 1738 sensor output is connected with timer IC trigger Pin, when the IR signal Received by TSOP 1738 then it produce output and triggers the timer IC, here timer IC configured in monostable multivibrator and hence produce single pulse depends on the timer Resistor (R2) and Capacitor (C2) value.

Output from the timer is applied to clock input of IC 4017 and this IC counts the clock, If the count starts from zero then Q1 output becomes HIGH then transistor BC 547 gets turn on and makes the Relay to get ground supply, then Relay coil gets energized and attracts the lever to N/O contact then the bulb gets power supply and starts to glow.

If the counter IC gets pulse from timer IC and the counter starts count from one (Q1 – HIGH) then Q2 output becomes HIGH and this signal biased to Reset pin 15 and hence every thing on counter gets Reset, so the Q1 becomes low or zero then transistor becomes turn OFF, so the Relay also gets turn OFF hence the bulb disconnected from the AC supply and bulb becomes turn OFF.

Note:- This circuit involved in handling of High volt AC supply, Handle with extreme care.

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