Tuesday, 29 January 2013

REMOTE CONTROL BASED HOME APPLIANCES CONTROL



Remote control for home appliances is an absolute necessity in our fast-paced life. As a result, much important has been given to this aspect and a range of remote controls are prevalent today. One of the most common is that which makes use of IR radiations at particular frequencies. Our product is a Remote Operated Home Appliance or Remote controlled Home appliance. The circuit is connected to any of the 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 general-purpose PCB. The circuit essentially consists of a transmitter consisting of a 555 IC; the receiver consisting of an IR module, CD4017 IC, LED’s to indicate the reception of the IR radiations, otherwise indicating the ON/OFF state, relay and other components.
                                                                 
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 meters. The 38 kHz 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 product consists of a remote which is the transmitter of the IR radiations and the receiver which responds to the radiations and switches ON and OFF the appliance.
TRANSMITTER

The transmitter is basically an astable multivibrator using 555 timer IC which provides a 38 kHz frequency at its output. The circuit here uses 555 timer IC to avoid fast switching. (This can also achieved by using a high value capacitor across TSOP sensor.) You can only switch the circuit after 3 seconds.

RECEIVER
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 meters. 


Circuit Operation:

The 38 kHz 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 resistor R5 and the output is taken from pin 3. The output signal is amplified by 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 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 IN4007 (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.
Result, we get a relay toggling on each press on the remote.( If a DC 12 volt relay is to be operated, then a regulated DC 12 volt power supply is used and the circuit voltage should not exceed DC 5 volts). Any appliance connected to this circuit can be switched ON or OFF.

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