IR SENSOR

      An Infrared sensor is an electronic device that emits and detects IR radiation in order to sense objects. IR sensor consists of IR LED and IR Photodiode. When the IR transmitter emits radiation, it reaches the object and some of the radiation reflects back to the IR receiver. Based on intensity of reception by IR receiver, the output of the sensor is defined. The best example of IR sensor which we use in our homes is Television and Television remote.We can interface IR sensor with Arduino to detect the presence of objects. 

  

Applications:

• It can be used as a Security system        
• It is used for Lighting appliances
• It can be used as Remote control based applications
• It can be used to indicate Water level

Sample Project Using Arduino:

        In this project we are going to turn ON the LED whenever the IR sensor senses objects or any other things.

Materials Required:

• ARDUINO UNO Board
• IR sensor module
• LED

Circuit Diagram:

Code:

int LED = 13; // initialize LED in pin 13

int SENSOR = 7; // initialize SENSOR in pin 7

int Obstacle = LOW; // initial declaration that there is no obstacle

void setup() {

pinMode(LED, OUTPUT); // Declaring LED as a output pin

pinMode(SENSOR, INPUT); // Declaring SENSOR as a input pin

Serial.begin(9600); // Enabling serail monitor

}

void loop() {

Obstacle = digitalRead(SENSOR); // Reads sensor value and store it in variable Obstacle

if (Obstacle == LOW) // Checking condition of the SENSOR pin whether it is HIGH/LOW

{

Serial.println("OBSTACLE!!");

digitalWrite(LED, HIGH);

}

else

{

Serial.println("clear");

digitalWrite(LED, LOW);

}

delay(200);
}

Serial Monitor Output: