TELEVISION REMOTE FOR CONTROLLING HOME APPLIANCES

As a engineer we should use small resources for big application.

Now,i am going to post about controlling a Home appliances using Television Remote.

Television remote uses infared rays for the transmission of signals from remote to Television.

For this you dont need any programing skills etc.Only you should have electronics skills

 

ELOBORATION OF CIRCUIT

*Connect any four Appliances in your home (Fan,radio,light etc).

*Remote of tv,vcd,dvd players can be used for turning on-off the appliances.

*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 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.

CIRCUIT DIAGRAM