Arduino Infra-red obstacle sensor

The infrared obstacle sensor is a compact IR proximity module designed for robotics and automation projects. It detects obstacles within a 2–40 cm range and outputs a TTL-level signal, making it easy to integrate with Arduino and other microcontrollers.

The detection distance is adjustable via a multi-turn potentiometer, and the sensor features an enable pin for programmatic control. Operating on 3.3–5V, it's compatible with both 3.3V and 5V logic systems.

Key Features

• Adjustable Detection Range – 2–40 cm, tuneable via multi-turn potentiometer
• TTL Output – Low when obstacle detected, high when clear
• Wide Voltage Range – Works with 3.3V and 5V systems
• Enable Pin – Programmatically enable or disable the sensor
• 35° Effective Angle – Focused detection cone for precise obstacle sensing
• Compact Size – 28 × 23 mm

Specifications

• Interface – 4-wire (GND / VCC / Signal / Enable)
• Working Voltage – DC 3.3–5V
• Working Current – ≥ 20mA
• Detection Distance – 2–40 cm
• Effective Angle – 35°
• Operating Temperature – -10°C to +50°C
• Board Size – 28 × 23 mm

Pinout

• + – Power (3.3–5V)
• GND – Ground
• OUT – Signal output (TTL)
• EN – Enable pin

Example Code

void setup() {
  Serial.begin(9600);
  pinMode(9, INPUT); // Sensor output pin
}

void loop() {
  Serial.print("Sensor: ");
  Serial.println(digitalRead(9));
  delay(500);
}

Ideal For

• Robot obstacle avoidance
• Proximity detection systems
• Automated line-following or maze-solving robots
• Arduino and microcontroller beginner projects

Package Contents

• 1× Infrared obstacle sensor