Remote Control Light Circuit Diagram Using 555 Timer

You may wonder if it’s possible to control a light using a remote controller. In this article CircuitsGallery presents an interesting DIY circuit that helps you to turn ON and OFF a lamp with a remote control.

Here we have made use of TSOP, an IR receiver which detects the IR rays from the remote. NE555 is the next important part which produces a clock pulse for toggling the D flip flop.The relay helps to connect any electrical devices to the circuit and you can control any electrical equipment, not only a light.

You must need regulated power supply of 5 volt to do this circuit because TSOP requires 5v. Its voltage should not exceed 5V.

You can use normal remote control of home appliances for this and of course I meant the one with Infra Red transmitter. Or else if you’re interested to make one of your own then it’s simple, just have a look at our simple IR transmitter and receiver circuit.

Circuit Diagram of Remote Control Light

 Remote Control Light Circuit Diagram Using 555 Timer
Click on the image for enlarged view

Components Required

  1. 230v to 6v step down transformer
  2. 7805 voltage regulator
  3. TSOP IR receiver
  4. IC 555
  5. IC 7474
  6. BC 187 Transistor
  7. Diode 1N4007x5
  8. Resistors (220KΩ, 100Ω)
  9. Relay (6V)
  10. Capacitor (1μF, 470μF)

Working of Remote Control Light Switch

  • Power supply circuit is not shown here. 1st you build a Rectifier circuit for 6v DC and proceed.
  • Maximum voltage of TSOP and 7474 is 5V hence we are using 7805 voltage regulator IC to get constant 5V DC.
  • The output of TSOP is always 5V, and the output will be zero when IR rays strikes on it.
  • 555 IC biased as a Monostable Multivibrator. Normally its output is 0V (ground potential), provided that voltage at the 2nd pin must be greater than 1/3Vcc.
  • When the voltage at the 2nd pin goes below 1/3Vcc output switches to high (5V) for the time T=1.1RC after the time interval output returns to 0V again.
  • The D-flip flop7474 is wired as Toggle mode, i.e. Q’ to D input. 555 used as clock generator to the flip flop.
  • When it get a clock pulse Output goes to High and remain in that state until it get next pulse.
  • On receiving next pulse output goes to low and remain in that state till the next pulse.
  • This process will continue.
  • Output of 7474 is fed to base terminal of BC 187 which is driver transistor, when it base voltage is high current will flow through the load
  • Here relay is the load and it will energize only when the base voltage of BC 187 is high and connects the 230v AC supply to the Bulb or light.

(Read More: How to Connect relay in circuit)

  • Diode Df is freewheeling diode used to dissipate the stored energy in the inductor load. It is essential for the smooth working of this circuit

Circuit workout video

Here is the video demonstration showing working of the circuit. Enjoy…!

Components Pin out

32 thoughts on “Remote Control Light Circuit Diagram Using 555 Timer

  1. Dear sir i have no more knowledge about electronics but…but i am taking intrest learn it..so plz help me.i want to build circuit remot control light,,,there for i see your daigram….but howw to build i remote…who remot working with this circuit….please sir help me

  2. Hi! Cool project.
    But I have a question. My circuit isn’t working. And through testing, I found out that my TSOP output voltage only goes to 3 V after it receives an IR signal. What can I do to solve this problem? Please help me.
    Thanks in advance.

  3. Hi! I just have something to clarify with you. BC 187 is a PNP transistor but the symbol on the circuit diagram is for an NPN transistor. Should I use a PNP or an NPN transistor for my circuit?

  4. sir i have KT27S05 RELAY to use in this circuit please provide details of 8 pin to be connected in the circuit and how and where to connect 220v ac and bulb if possible give the circuit diagram in details.

  5. I would like to know more about the freewheeling diode, and I have a Diode 1N4001 with me, will it be working with the relay like with Diode 1N4007 or circuit will create trouble.

  6. I connected an LED in place of the relay circuit, my output was the LED was blinking and the remote was doing nothing. Is there any problem in my connection.

  7. Admin, I did not get the meaning of TSOP exactly in remote controlled lamp circuit.
    Ya, I understand that it has three terminals Vs, GND, OUT. But what is that component exactly? Is that any IC? What should I call it when I will go to purchase in electronic shop?

    • Hi Purva
      Simply it’s an IR receiver module which has inbuilt IR receiver and demodulator. It produces demodulated active low output, you can call it as TSOP or IR receiver.

  8. hi.
    nice circuit. but U have some problem as I can’t find the BC187 Transistor what is the replacement IC for this. I am living is Sri Lanka. (Asia) please help me to fine the simile Transistor for BC187

    Thank you,

  9. sir, i am make remote control switch and work properly , but when on/off inductive load this switch is running . i know how to protect electrical signal and light radition.
    sir pls reply me early

    thanks n regards

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