Electronics Projects

IR (Infrared) Remote Control Switch Circuit

remote controlled switch

IR (Infrared) Remote Control Switch Circuit for home appliances is an very much necessity in our fast-paced life. As a result, much importance has been given to this aspect and a range of remote controls are prevalent today. One of the most frequent is that which makes use of IR radiations at particular frequencies for operations.

This circuit 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 8 meters. It is very easy to build and can be assembled on a normal prototype PCB.

The circuit essentially consists of an  IR Receiver module, CD4017 Decade counter IC, LED’s to indicate the reception of the IR radiations, otherwise indicating the ON/OFF state, relay, and other components.

Components Required

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

Circuit

remote controlled switch

Circuit Description

The product consists of a remote which is the transmitter(TV remote) of the IR radiations and the receiver which responds to the radiations and switches ON and OFF the appliance.

RECEIVER

Connect this circuit to any of your home appliances to make the appliance turn on/off from a TV, VCD or DVD remote control. The circuit can be activated from up to 8 meters.

Circuit Operation:

The 38 kHz IR rays generated by the IR remote control are received by IR receiver module TSOP 1738 of the circuit. Pin1 of TSOP1738 goes to ground, pin2 goes to the power supply through the resistor R5 and the output is available at pin3. The output signal is amplified by transistor T1 (BC558). The amplified signal is given to clock pin 14 of decade counter IC CD4017 (IC1). Pin8 of IC goes to ground supply, pin 16 goes to Vcc supply and pin 3 goes to Red LED, which glows to indicate that it is ‘off.’

The output of IC1 is taken from its pin2 of IC. LED2 is connected to pin2 is used to indicate the ‘on’ state of the appliance. Transistor T2 (BC548) base connected to pin2 of IC1 which drives the relay and acts as switching mechanism. The appliance to be controlled is connected to 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 gets input. The result, we get a relay toggling on each press on the remote. Any appliance connected to this circuit can be switched ON or OFF.

PHOTOMODULE (TSOP1738): The TSOP17-XX is a series are miniaturized receivers for infrared remote control systems. The diode and preamplifier are assembled on the frame, the epoxy-package is designed as IR filter.

CD4017BC IC: It is a 5 stage divide by 10 Johnson counter with 10 decoded outputs and a carryout bit. The configuration of this IC permits medium speed operation and assures a hazard-free counting sequence. The decoded outputs are normally in the logical 0 state and go to the logical 1 state only at their respective time slot only. Each decoded output remains high for one full clock cycle. The carry-out signal completes a full cycle for every 10/8 clock input cycles and is used as a ripple carry signal to any succeeding stages.

RELAY ( 5V DC): Relays are components which allow a low-power circuit to switch a relatively high current on and off, or to control signals that must be electrically isolated from the controlling circuit itself.

Testing

After soldering the components on to the PCB, the boards are thoroughly cleaned for removing any residual flux and wire leads. All the components are checked for their values and proper orientation if applicable. Before ICs are inserted into the sockets, power is applied to the board and voltages are measured at the IC power points. Other  DC voltages are also checked if possible. The supply voltages are monitored and verified. Working is tested by aiming the IR beam from the transmitter to the IR module of the receiver and observing the lighting of the LEDs in the receiver.

Applications

A remote-controlled device primarily saves a lot of time and energy. Its significance in today’s world is in trending path when people don’t have to unnecessarily waste their time in operating the appliances by being near to the appliance. They can operate it while they’re engrossed in whatever task they’re doing and don’t have to bother leaving it in between.

The remote control can extend up to a long distance depending on the frequency used and the efficiency of the circuit. It is an advantage that it can be operated from distances.It can be used in the case of a number of devices and applications such as TV, VCR, lamp, fan, music system or even any simple tasks such as simply opening a door.

A single remote control can be made to operate at different frequencies, each corresponding to a particular task to be performed by the appliance, for example, television. The circuit has the advantages that it can be easily implemented using easily available and low-cost components. The maintenance is also easy.

You can find some advanced relevant ir remote electronics project here.

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