IR Remote Control circuit for controlling home appliances can be easily made using Decade Counter I.C CD4017 and (any TSOP can be used) infrared receiver. This circuit can easily control your home appliances. Any type of remote can be used to control this circuit like DVD,TV,CD player and so on.
This circuit consists of tow stages input stage and output stage
input stage consists of bc557 pnp transistor TSOP4.7k resistor and 100uf capacitor. As we press any key of remote a signal generate and drops on the IR receiver (TSOP). TSOP trigger to bc557 and Bc 557 trigger to IC through pin 14 of IC 4017 (decade counter ic)
As IC Trigger through pin 14 a pulse generate on pin 2 of ic and remain on pin 2 till new pulse. In this way BC 547 turned on and relay also turned on through BC 547. As new pulse come through input stage pulse on pin 2 transfer to pin 3 and in this way BC 547 turned off and relay also turn off.
Pins detail of IC,TSOP1838 and Transistors
List of components
- I.C (CD4017)
- 6 volt Relay
- TSOP 1838
- Transistor (BC547, Bc556)
- 100uf Capacitor
- Resistors (1k, 4.7k, 100ohm)
- Green LED for on status
- Red LED for Off status
Working of remote control circuit
When firstly, power is applied to I.C 4017(decade counter i.c), output at PIN 3 is HIGH as we press the button of IR remote, then a LOW to HIGH clock pulse is applied to PIN 14 (first clock pulse) and output at pin 0(zero) becomes low and PIN 2 becomes HIGH. PIN 2 triggers the RELAY module, and the AC light becomes ON. Now this position will remain constant until the next clock pulse as we press the Button of IR remote again (second clock pulse), output at Q1 becomes LOW and Q2 becomes HIGH. This will deactivate the Relay and switch off the light. Because Q2 is connected to the RESET pin(pin 15) of 4017, it will reset the I.C and again output at Q 0(zero) becomes HIGH and Q 2 becomes LOW (initial state). So it works like a toggle switch.
Alternative Circuit With Animated description
If you want to control this circuit using 12 volts DC then you should use 7812 Regulator and if you want to operate it with 9 volts then use 7809 regulator.