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Lesson 08: IR Obstacle Avoidance Sensor Module

In this lesson, you will learn how to use an Infrared obstacle avoidance sensor with an Arduino Uno. We will explore how to read digital signals from the sensor to detect obstacles. You’ll see how the sensor’s red indicator light illuminates in the presence of obstacles and how it sends a low-level signal to the Arduino. This lesson is perfect for beginners, providing hands-on experience with reading digital inputs and practicing serial communication on the Arduino platform.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
Arduino UNO R3 or R4	BUY
IR Obstacle Avoidance Sensor Module	BUY

Wiring

../_images/Lesson_08_IR_obstacle_module_uno_bb.png

Code

Code Analysis

Define pin number for sensor connection:
```
const int sensorPin = 2;
```
Connect the sensor’s output pin to Arduino pin 2.
Setup serial communication and define sensor pin as input:
```
void setup() {
  pinMode(sensorPin, INPUT);
  Serial.begin(9600);
}
```
Initialize serial communication at 9600 baud rate to print to serial monitor. Set sensor pin as input to read input signal.
Read sensor value and print to serial monitor:
```
void loop() {
  Serial.println(digitalRead(sensorPin));
  delay(50);
}
```
Continuously read digital value from sensor pin using digitalRead() and print value to serial monitor using Serial.println(). Add 50ms delay between prints for better viewing.

Note

If the sensor is not working properly, adjust the IR transmitter and receiver to make them parallel. Additionally, you can adjust the detection range using the built-in potentiometer.