Remote Control Light


The aim of the project is to control lights or fans using a remote controller through an easily circuit based on 555 timer. The lights or fans can be made ON or OFF through the remote.For the remote, the normal household T.V remote with IR transmitter can be used.
To implement the above we have made use of TSOP which is a miniaturized receiver for infrared remote control systems, 555 timer which is used to produce clock pulse to toggle the D flip flop and relay which is a contactor or electrically controlled switch used for switching a circuit.


  • 230v to 6v step down transformer (used this only if it is required to convert AC supply into DC supply)
  • 7805 voltage regulator  ( to provide a regulated 5v to the circuit)
  • TSOP IR receiver
  • IC 555
  • IC 7474
  • BC 187 Transistor
  • Diode 1N4007x5
  • Resistors (220KΩ, 100Ω)
  • Relay (6V)
  • Capacitor (1μF, 470μF)


  1. TSOP and 7474 are 5v operated. The output of the TSOP is 5V but when IR ray strikes the output at TSOP becomes 0V. Diode Df is freewheeling diode dissipating the stored energy in the inductor load. It is providing the smooth working of this circuit. 555 IC is acting as a Monostable Multivibrator. 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. 



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