Direct sunlight or heavy incandescent lighting contains large amounts of infrared radiation. This can flood the photodiode and cause false triggers. For outdoor use, shield the sensor housing from direct sunlight. Common Applications
If your FC-51 module is not performing as expected, review the following debugging steps: Scenario A: The Obstacle LED is always ON
The FC-51 module integrates several key components on a single printed circuit board (PCB): Fc 51 Ir Sensor Datasheet
Connect the FC-51 sensor to an Arduino board using the following pin map: →right arrow Arduino 5V or 3.3V GND →right arrow Arduino GND OUT →right arrow Arduino Digital Pin 2 Sample Arduino Code
The sensitivity potentiometer is likely turned too far clockwise. Turn it counter-clockwise until the green LED turns off, then test it by placing your hand in front of the sensor. Common Applications If your FC-51 module is not
Helps autonomous rovers steer away from walls and obstacles.
Turning decreases the detection distance (lower sensitivity). Calibration Procedure Turning decreases the detection distance (lower sensitivity)
, a tiny but mighty module that brings your creations to life.
Supports a flexible range from 3.0V to 6.0V , making it compatible with both 3.3V (Raspberry Pi/ESP32) and 5V (Arduino) systems.
Understanding the FC-51 IR Obstacle Avoidance Sensor: A Comprehensive Datasheet Guide
Note: Turning the potentiometer too far clockwise will cause the sensor to lock into a permanent "LOW" state, indicating an obstacle even when the path is completely clear. Interfacing FC-51 with Arduino