Infrared sensors are used extensively in various applications because of its wide range of applications. Infrared signals detect the light emitted from the source signal to be detected and works on the principle of radiation. The detect the objects around them by switching the signal from the device, they can also measure heat and can works as a motion detector. This is the basic principle of IR sensors, let’s make it understand practically.
- BC 557 Transistor x 1
- TSOP 1738 x 1
- IN4007 diode x 1
- 120k, 1k, 330k ohm resistor
- LED x 1
- Connecting wires
- 9v Battery
- 9v Battery clip
1. Insert the BC 557 transistor on the bread board
2. Insert the TSOP 1736 sensor on the bread board
3. Connect the emitter of transistor to the positive rail of the bread board and connect the ground of TSOP 1738 to ground.
4. Connect the LED on bread board then it will look like this
5. Connect the collector of the transistor to the anode of the LED
6. Connect the base of the transistor to the output of TSOP 1738 with 120k resistor
7. Connect the 330 ohm resistor from the Vcc of TSOP 1738
8. Connect the diode to the positive rail of the diode to 330k ohm resistor
9. Connect the anode of LED to negative rail of the bread board and connect 9v battery 9v battery clip.
10. Connect positive terminal positive rail of the bread board and negative to negative rail of bread board.
11. Our circuit is ready to control, as soon as we pressed the button of the remote the IR sensor detects and LED blinks
and we press the button again the Led stops glowing as shows
So this is the basic principle of IR sensor functioning and operation.