19-09-2012, 03:25 PM
Home Appliance Control Using Remote
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Here is the circuit diagram of Remote Operated Home Appliances or Remote controlled Home
appliances. Connect this circuit to any of your home appliances (lamp, fan, radio, etc) to make the
appliance turn on/off from a TV, VCD, VCR, Air Conditioner or DVD remote control. The circuit can be
activated from up to 10 meters. It is very easy to build and can be assembled on a veroboard or a
general-purpose PCB.
Circuit Operation:
The 38kHz infrared 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 R5 and the output is taken from pin 3. The output signal is amplified by Q1. 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 D2 (Red LED), which glows to indicate that the
appliance is ‘off.’
The output of IC1 is taken from its pin 2. D3 connected to pin 2 is used to indicate the ‘on’ state of the
appliance. Q2 connected to pin 2 of IC1 drives relay RL1. D1 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
energizes. If you want to operate a DC 12 volt relay then use a regulated DC 12 volt power supply for
DC 12 volt Relay and remember that the circuit voltage not be exceeded more than DC 5 volts.