Lesson-06 : Interfacing of IR sensor with Arduino Uno

Pankaj Maurya
Sep 16, 2023
2 min read

Updated: Sep 26, 2024

Let us start with introduction of IR sensor and then will see interfacing of IR sensor with Arduino Uno.

IR sensor:

An infrared (IR) sensor is an electronic device that measures and detects infrared radiation in its surrounding environment.

There are two types of infrared sensors:

Active IR sensor
Passive IR sensor

Active infrared sensors both emit and detect infrared radiation. Active IR sensors have two parts: a light emitting diode (LED) and a receiver. When an object comes close to the sensor, the infrared light from the LED reflects off of the object and is detected by the receiver. Active IR sensors act as proximity sensors, and they are commonly used in obstacle detection systems (such as in robots).

Interfacing IR sensor with Arduino

Components Required:

Arduino Uno with usb cable
IR sensor
Jumper wires (Male to Male (3))
Breadboard (optional)
LCD (optional)

Connections of IR sensor with Arduino is explained in steps

Connect the VCC of the IR sensor to the +5v of Arduino
Connect the GND of the IR sensor to the GND of Arduino
Connect the OUT/Signal pin to the digital pin 2 of Arduino

Pre-coding Steps: -

Define the Pin Mode in the void Setup
Define the logic in the void Loop

Functions used in this example:

pinMode(Pin_Number, IN/OUT); to set the mode i.e. input or output for example pinMode(3,OUTPUT);
digitalWrite(Pin_Number,LOW/HIGH); to set the pin as High or low for example digitalWrite(3,LOW);
digitalRead(2); to read the status
delay(microseconds) to put a time delay between two instructions. For example delay(1000) i.e. 1 sec delay
Serial.println() or Serial.print() to display the value on the serial monitor.