The Working Principle and Key Applications of Infrared Sensors !

IR SENSOR

An infrared sensor is an electronic device, that emits in order to sense some aspects of the surroundings. 

An IR sensor can also measure the heat of an object as well as to detect the motion. So, it is broadly used in sensor-based projects. 

The emitter is an IR LED ( light-emitting diode) and the detector is an IR photodiode that is sensitive to IR light of the same wavelength as that emitted by the IR LED. These types of sensors measure only infrared radiation, rather than emitting it so they are called passive IR sensors. 

The type of radiations detected by an infrared sensor is invisible to our eyes. 

When IR light falls on the photodiode, the resistance and the output voltages will change in proportion to the magnitude of the IR light received. 

An infrared sensor circuit is one of the basic and popular sensor modules in an electronic device. This sensor is analogous to human's visionary senses, which can be used to detect obstacles and it is one of the common applications in real-time. 

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Different types of IR Sensors and their applications

IR Sensors are classified into different types depending on the applications. Some of the applications are:

1)  Speed sensor: It is used for synchronizing the speed of multiple motors. 

2) Temperature sensor: It is used for industrial temperature control.

3) PIR sensor: It is used for an automatic door opening system.

4) Ultrasonic sensor: They are used for distance measurement.

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IR sensor application

IR sensors are used in various sensor-based projects and also in various electronic devices that measures the temperature.

Down below we are providing a video tutorial for you to understand the working of IR sensors with Arduino. It is a beginner's guide with an Arduino tutorial, which we found to be the best video on Youtube on the same topic. Hope it'll help you to clear all your doubts :

Things you'll need :

1) LM358 IC IR transmitter and receiver pair.

2) Resistors of the range of kilo-ohms.

3) Variable resistors.

4) LED (Light Emitting Diode)

Connections :

ARDUINO CODE:

int LED=13; //use the onboard LED

int IR_PIN=12; //this is our input pin

void setup()

{

pinMode(LED, OUTPUT);

pinMode(IR_PIN, INPUT);

Serial.begin(9600);

}

void loop()

{

if (digitalRead(IR_PIN)== HIGH)

{

Serial.println("stop something is ahead!!");

digitalWrite(LED, HIGH); //Turn ON the LED on 13th Port

}

else

{

Serial.println("Path is clear");

digitalWrite(LED, LOW); //turn OFF LED on 13th Port

}

delay(2000);

}

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