Content

  1. Introduction
  2. Preparations
  3. About the IR Obstacle Avoidance Sensor
  4. Example
  5. Connection
  6. Upload Sketch
  7. Program Running Result

Introduction

This is yet another one of those modules with cool possibilities. You could for example, sound an alarm when something got too close or you could change the direction of a robot or vehicle.
The device consists of an Infrared Transmitter, an Infrared Detector, and support circuitry. It only requires three connections. When it detects an obstacle within range it will send an output low.

Preparations

Hardware

Software

About Obstacle Avoidance Sensor

IR Obstacle Detection Module Pin Outs

Specification

Working Principle

The IR transmitter sends an infrared signal that, in case of a reflecting surface (e.g. white color), bounces off in some directions including that of the IR receiver that captures the signal detecting the object.

When the surface is absorbent (e.g. black color) the IR signal isn’t reflected and the object cannot be detected by the sensor. This result would occur even if the object is absent.

Examples

Using the Obstacle Avoidance Sensor with Arduino

In this experiment, we will use an Obstacle Avoidance Sensor module and the LED attached to pin 13 of the Osoyoo Uno board to build a simple circuit. Since the LED has been attached to pin 13, connect the pin OUT to digital pin 2 of the Uno board. When the Obstacle Avoidance Sensor detects an obstacle, the LED will be on. Otherwise it will be off.

Note: The detection distance of the infrared sensor is adjustable - you may adjust it by the potentiometer.

Connection

Make sure the Enable Jumper is placed on the Infrared Obstacle Avoidance sensor, Build the circuit as below digram:

Code Program

After above operations are completed, connect the Arduino board to your computer using the USB cable. The green power LED (labelled PWR) should go on.Open the Arduino IDE and choose corresponding board type and port type for you project. Then load up the following sketch onto your Arduino.

int LED = 13; // Use the onboard Uno LED
int isObstaclePin = 2;  // This is our input pin
int isObstacle = HIGH;  // HIGH MEANS NO OBSTACLE

void setup() {
  pinMode(LED, OUTPUT);
  pinMode(isObstaclePin, INPUT);
  Serial.begin(9600);  
}

void loop() {
  isObstacle = digitalRead(isObstaclePin);
  if (isObstacle == LOW)
  {
    Serial.println("OBSTACLE!!, OBSTACLE!!");
    digitalWrite(LED, HIGH);
  }
  else
  {
    Serial.println("clear");
    digitalWrite(LED, LOW);
  }
  delay(200);
}

Running Result

A few seconds after the upload finishes, place a board in front of the Obstacle Avoidance Sensor, and the LED attached to pin 13 on the Osoyoo Uno board will light up, the on-board obstacle led will turn on. It will turn off when there is no obstacle.

At the same time, choose the corresponding port type for you arduino board and open the Serial Monitor of the Arduino IDE, make sure the baudrate is same as your code, move the obstacle in front of the Obstacle Avoidance Sensor, you will see the serial output as below: