25-08-2017, 09:32 PM
REMOTE CONTROL FOR HOME APPLIANCES
REMOTE CONTROL.pdf (Size: 74.15 KB / Downloads: 81)
connect this circuit to any of your home appliances (lamp, fan, radio, etc) to
make the appliance turn on/off from a TV, VCD or DVD remote control. The circuit
can be 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), 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 1N4007 (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 energises.