Introduction

The IR Obstacle Avoidance Sensor is a reflective photoelectric detection module that uses infrared light to detect objects within 2-30cm. With adjustable sensitivity and digital output, it’s ideal for robot navigation, object counting, and automation systems.

Key Features

Technical Specifications

Pin Configuration

Pin	Label	Description	Arduino Connection
1	VCC	Power (3.3V-5V)	5V
2	GND	Ground	GND
3	OUT	Digital Output	D2 (Digital Pin)

Wiring Diagram (Arduino)

// Basic Connections:
// VCC → 5V
// GND → GND
// OUT → D2 (or any digital pin)

// For best results:
// - Mount sensor 5-10cm above surface
// - Avoid direct sunlight interference

Basic Detection Example

const int IRSensor = 2; // Connected to OUT pin

void setup() {
  Serial.begin(9600);
  pinMode(IRSensor, INPUT);
}

void loop() {
  int obstacle = digitalRead(IRSensor);
  
  if (obstacle == LOW) {
    Serial.println("Obstacle detected!");
    // Add your response code here
  }
  delay(100);
}

Advanced Applications

// Connect OUT to analog pin
int sensorValue = analogRead(A0);
// Higher values = closer objects
// Requires threshold calibration

// Array of sensor pins
int sensorPins[] = {2,3,4,5};

void setup() {
  for(int i=0; i<4; i++) {
    pinMode(sensorPins[i], INPUT);
  }
}

// Software debounce
unsigned long lastDetect = 0;
const int debounceDelay = 50;

if(digitalRead(IRSensor) == LOW && 
   millis() - lastDetect > debounceDelay) {
  lastDetect = millis();
  // Trigger action
}

// Simple obstacle avoidance
if(digitalRead(leftSensor) == LOW) {
  turnRight();
}
else if(digitalRead(rightSensor) == LOW) {
  turnLeft();
}
else {
  moveForward();
}

Troubleshooting