Fc 51 Ir Sensor Datasheet Page

Mounted on the front or sides of wheeled robots to prevent collisions.

The effective range of the FC-51 depends heavily on the color and texture of the obstacle. Black surfaces absorb infrared light, significantly reducing the detection range (sometimes down to zero). Conversely, white or highly reflective surfaces maximize the detection range. Interfacing FC-51 IR Sensor with Arduino Uno Fc 51 Ir Sensor Datasheet

Sunlight and incandescent bulbs emit massive amounts of infrared light, which can blind or saturate the IR receiver. Mounted on the front or sides of wheeled

The FC-51 is a low-cost, highly efficient infrared (IR) obstacle avoidance sensor widely used in robotics, automation, and smart home projects. This module utilizes a pair of infrared transmitting and receiving tubes to detect obstacles within a specific range. When an object enters the detection field, the infrared light reflects back to the receiver, triggering a digital output signal. Conversely, white or highly reflective surfaces maximize the

| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | Output always HIGH | Sensitivity too low / Object too far | Turn potentiometer clockwise. | | Output always LOW | Sensitivity too high / Always detecting floor | Turn potentiometer counter-clockwise. | | Erratic output | Loose wiring / Power supply noise | Check connections; add a 100µF capacitor across VCC/GND. | | Detects only white, not black | Normal behavior | Increase sensitivity or move sensor closer. | | No output change at all | Wrong pin mapping or dead sensor | Test with multimeter: VCC = 5V, OUT should toggle when covering sensor with hand. |