Remote Control For Home Appliances

Using remote control for home appliances is a great choice. They can be used to on and off the appliances like TV, AC, DVD player, motor etc with the help of our TV remote. LED's can be used to on and off. IF LED1 is glowing, it means device is off and if LED2 glows than the device connected is on. This is a low cost simple remote control circuit is based on the CD4017 counter IC which receives trigger pulse from IR sensor and switch on the relay. Since, the device is connected to relay it is also switched on. Upon receiving the second pulse motor become off. You can control your toy car from 5 meters range.

This is a simple remote control circuit based on infrared sensor IC TSOP1738. TSOP1738 contains photo detector and pre-amplifier both in one package. It is a three terminal device. Pin 1 is for ground, Pin 2 is for power supply and pin 3 is used as output. Pin diagram of TSOP1738 is shown below. Take care while connecting the pins of TSOP1738. Wrong lead connection of TSOP1738 may lead to sensor damage.

Fig. 2: Image Of Pin Diagram Of TSOP1738 IC

CD4017 is a CMOS counter/ divider IC. It takes clock signal from the clock input and turn on the 10 output in sequence each time when it receives clock input pulses. It is the most popular IC and is extremely useful in project like Light Chaser, Matrix Die. Assemble the circuit as shown in circuit diagram and apply power supply. When you press the remote, 38 KHz infrared rays (IR) is generated through remote control (which used as transmitter) and these rays are received by TSOP1738 which act as receiver in our circuit. Then these weak signals at output pin 3 of TSOP1738 are amplified by transistorT1.

Now, these amplified signals are fed into the clock input pin 14 of IC2. Therefore when you press any button on of the remote, clock input pin 14 goes high which provides a clock pulse for the working of IC2. Here after receiving the clock input CD4017 starts its counter from zero (as it has inbuilt counter) and it advances one by one each time pin 14 goes high. Like first we get output from pin 3 that is Q0 and LED1 will glow. When you press the button again from remote, pin 2 of IC2 will become high and LED2 will glow. Indicating that device is on. You have to connect a relay at the outputs. One end of relay should be connected to collector of transistor T2 and another end of relay should be connected to supply.