IR remote control circuit diagram
Here the circuit of 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 toggle switch circuit using IC 4017 and a transmitter circuit using a 555 IC.
IR Receiver circuit
The receiver circuit is similar to a toggle 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. As a voltage drop obtains across the resistor R1 when the IR ray flashes on IR diode, a positive edge triggering gets at the clock input and the output toggles only for the next positive edge of the clock pulse.That is the flash should OFF and ON again. Thus the circuit can be ON and OFF for each flash of the IR light.
IR Remote circuit
The IR remote consist of a one shot pulse or monostable multivibrator using a 555 IC which have a time period less than a second. An IR LED using a simple supply and a push-switch can act as an IR remote and 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 the false counting due to the motion of the hand or any improper passing, which may generate multiple pulses. Thus the circuit flashes only a minute interval even for a prolonged press of push switch.
IC1 – 4017
Resistor – R1 – 560, R2 – 10k, R3 – 1K
Transistor – Q1 – BC547
Diode – D1 – 1N4007
IR receiver diode
Relay – SPST 12V, 200ohms
Resistor – R1 – 1k, R2 – 560
Capacitor- C1 – 100uf, C2 – 33pf, C3 – 100nf