This is the most popular IR Remote control circuit for home appliances like lamp, fan, radio, tv etc to make the appliance turn on/off from a TV, VCD or DVD remote control. It is very simple to build because of few components and simple design.
The circuit can activated from up to 10 metres. The 38kHz infrared (IR) rays generated by the remote control are received by IR receiver module TSOP1738 of the circuit. Pin 1 of TSOP1738 is connected to ground, pin 2 is connected to the power supply through resistor R5 and the output is taken from pin 3. The output signal is amplified by transistor T1 (BC558).
The amplified signal is fed to clock pin 14 of decade counter IC CD4017 (IC1). Pin 8 of IC1 is grounded, pin 16 is connected to Vcc and pin 3 is connected to LED1 (red), which glows to indicate that the appliance is ‘off.’ The output of IC1 is taken from its pin 2. LED2 (green) connected to pin 2 is used to indicate the ‘on’ state of the appliance. Transistor T2 (BC548) connected to pin 2 of IC1 drives relay RL1. Diode IN 4148 acts as a freewheeling diode. The appliance to be controlled is connected between the pole of the relay and neutral terminal of mains. It gets connected to live terminal of AC mains via normally opened (N/O) contact when the relay energises. you can use any NPN transistor inplace of BC548. You can also use SL100 or any NPN transistor lying around you.
The delay depends on the C1 capacitor. Using higher value capacitor will create more delay and using less value capacitor will switch the circuit more than 2 times when you press a remote. Analyse the circuit by placing the 10uf capacitor in place of C1 (100uf).
The amplified signal is fed to clock pin 14 of decade counter IC CD4017 (IC1). Pin 8 of IC1 is grounded, pin 16 is connected to Vcc and pin 3 is connected to LED1 (red), which glows to indicate that the appliance is ‘off.’ The output of IC1 is taken from its pin 2. LED2 (green) connected to pin 2 is used to indicate the ‘on’ state of the appliance. Transistor T2 (BC548) connected to pin 2 of IC1 drives relay RL1. Diode IN 4148 acts as a freewheeling diode. The appliance to be controlled is connected between the pole of the relay and neutral terminal of mains. It gets connected to live terminal of AC mains via normally opened (N/O) contact when the relay energises. you can use any NPN transistor inplace of BC548. You can also use SL100 or any NPN transistor lying around you.
Really helpful post. I never thought that infrared is used in remote control. Thanks for sharing this knowledge to us. Get more Info related to your post.
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this circuit is doing great. we hav used this circuit in our first year project. we have now been controlling 7 appliances by some modifications.thanks alot.
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ReplyDeletecan someone help me with the relay pinout? im a novice at this and am confused about the relay pinout on this circuit. I have a 6v relay with NO NC A B and Pole pinouts. thanks
ReplyDeleteHi. I could not find in the market the infrared receiver TSOP1738. Could you give me a list of equivalent circuits of this IC? Thanks in advance. I really would like to build this circuit. In fact this is the remaining component that I was not able to buy.
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Nice post. Very useful information. will keep in mind while purchasing home appliances in future.
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Mr. Biswas,
ReplyDeleteYour project is very nice. But how to control the speed of the ceiling fan. Is it possible to control separately both a fan speed and a light from the same unit. Where can I get a PCB?
Regards,
DK Ghosh
Kolkata
E-mail: dkghosh5555@gmail.com
please help me.....my circuit turns on but doesnt turn off
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Krishan services said
ReplyDeleteThis is the most popular IR Remote control circuit for home appliances like lamp, fan, radio, tv etc to make the appliance turn on/off from a TV, VCD or DVD remote contro
You are right!
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