29-08-2017, 01:33 PM
The influx of Internet things (IoT) devices has created a great demand to connect everything to everything. In the same race, this remote control for appliances allows you to connect your daily devices to be controlled by a remote control. All you have to do is connect this circuit to any of your appliances (lamp, fan, radio, etc.) and they are good to go. The apparatus can now be controlled by a remote control operating at the designated frequency. The circuit can be activated up to 10 meters.
Remote Control for Appliances: Basic Concepts of Work
The 38kHz infrared (IR) generated by the remote control is received by the TSOP1738 IR receiver module 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 the clock pin 14 of the decade counter IC CD4017 (IC1). Pin 8 of IC1 is connected to ground, pin 16 is connected to Vcc and pin 3 is connected to LED1 (red), which illuminates to indicate that the device is off.
The output of IC1 is taken from its pin 2. LED2 (green) connected to pin 2 is used to indicate the power-on state of the appliance. The transistor T2 (BC548) connected to pin 2 of the IC1 transmits the relay RL1. Diode 1N4007 (D1) acts as a freewheel diode. The device to be controlled is connected between the relay pole and the neutral terminal of the network. It is connected to the active terminal of the AC network through the normally open contact (N / O) when the relay is energized.
Circuit diagram
Remote Control for Appliances: Basic Concepts of Work
The 38kHz infrared (IR) generated by the remote control is received by the TSOP1738 IR receiver module 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 the clock pin 14 of the decade counter IC CD4017 (IC1). Pin 8 of IC1 is connected to ground, pin 16 is connected to Vcc and pin 3 is connected to LED1 (red), which illuminates to indicate that the device is off.
The output of IC1 is taken from its pin 2. LED2 (green) connected to pin 2 is used to indicate the power-on state of the appliance. The transistor T2 (BC548) connected to pin 2 of the IC1 transmits the relay RL1. Diode 1N4007 (D1) acts as a freewheel diode. The device to be controlled is connected between the relay pole and the neutral terminal of the network. It is connected to the active terminal of the AC network through the normally open contact (N / O) when the relay is energized.
Circuit diagram