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.
Parts:
R1 = 220K R2 = 330R R3 = 1K R4 = 330R R5 = 47R C1 = 100uF-16V C2 = 100nF-63V C3 = 470uF-16V D1 = 1N4007 D2 = Red LED D3 = Green LED Q1 = BC558 Q2 = BC548 IR = TSOP1738 IC1 = CD4017 RL1 = Relay 5V DC
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.
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