If you are building a line-following robot, a tachometer, or a proximity alarm, chances are you’ve stumbled upon the FC-51 IR Sensor Module. It is one of the most ubiquitous, low-cost infrared obstacle avoidance sensors on the market.
void loop() int sensorValue = digitalRead(sensorPin); if (sensorValue == LOW) // Obstacle detected digitalWrite(ledPin, HIGH); Serial.println("Obstacle!"); else digitalWrite(ledPin, LOW); Fc 51 Ir Sensor Datasheet
Detection Range: Adjustable from 2cm to 30cm via an onboard potentiometer. Decoding the FC-51 IR Sensor: A Complete Datasheet
Real-time Response: It uses an LM393 comparator for stable, fast performance, which is often quicker than ultrasonic sensors for simple binary obstacle detection. Real-time Response: It uses an LM393 comparator for
*Note: The EN (Enable) pin is rarely populated on standard breakout boards; usually, the sensor is always enabled.
Key Components on Board: