YSEF Robotics

IR Sensor

The Infrared (IR) Sensor detects objects or obstacles by emitting and receiving infrared light. It’s one of the most widely used sensors in robotics for detecting motion, measuring distance, or enabling line-following functionality.

How It Works?

An IR sensor has two main parts: an IR LED that emits infrared light, and a photodiode that detects the reflected light. When an object comes near, the IR light reflects back to the photodiode, which changes its resistance — allowing the microcontroller to sense the object.

Key Features

Detects nearby obstacles
Used in line-following and proximity detection
Low power consumption and fast response


// Arduino IR Sensor Example
// Connections:
// VCC  → 5V
// GND  → GND
// OUT  → D7

const int irPin = 7;  // IR sensor output connected to digital pin 7

void setup() {
  // Initialize Serial communication
  Serial.begin(9600);

  // Set the IR sensor pin as input
  pinMode(irPin, INPUT);
}

void loop() {
  // Read the digital signal from the IR sensor
  int value = digitalRead(irPin);

  // Check if an object is detected
  if (value == LOW) {
    Serial.println("🔴 Object Detected");
  } else {
    Serial.println("⚪ No Object");
  }

  // Wait for half a second before next reading
  delay(500);
}

Applications in Robotics

IR sensors are key components in smart automation and motion-based robotics systems.

Line Following Robots

Helps robots detect and follow black or white lines.

Obstacle Detection

Used to detect objects ahead and avoid collisions.

Automation Systems

Used in smart gates, counters, and motion detectors.

Energy Saving Devices

Turns on lights only when motion is detected.

IR Sensor

YSEF Robotics

IR Sensor

How It Works?

Key Features

Applications in Robotics

Line Following Robots

Obstacle Detection

Automation Systems

Energy Saving Devices

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