Absorb IR light. A matte black object may need to be significantly closer to the sensor to trigger a detection, a characteristic often exploited in line-following robots. Arduino Interfacing Guide
| Symptom | Possible Cause | Solution | | :--- | :--- | :--- | | Output LED always ON | Potentiometer too sensitive; object too close; power supply noise | Turn potentiometer CCW; move objects; add capacitor | | Output LED always OFF | No power; broken IR LED; range too low | Check Vcc/GND; turn potentiometer CW; test with white paper | | Erratic detection | Ambient IR noise (sunlight, CFLs); loose wires | Shield sensor; use shorter wires; add 10ms debounce in code | | Very short range (under 5 cm) | Potentiometer misadjusted; black target | Recalibrate; use reflective tape on target | | Module gets hot | Reverse polarity | Immediately disconnect; check pinout version |
The module features a standard 3-pin male header for easy interfacing.
If no obstacle is present, the light radiates outward and dissipates. When an object passes in front of the sensor, the IR light bounces off the object's surface. Fc 51 Ir Sensor Datasheet
Below is a simple, production-ready Arduino sketch designed to read data from the FC-51 sensor and trigger an action when an obstacle is detected.
The module typically features a 3-pin interface (sometimes 4 pins, though one is often unused).
Connecting the FC-51 to an Arduino requires only three jumper wires. Below is a step-by-step guide to building a basic obstacle detection circuit. Circuit Connections →right arrow Arduino 5V FC-51 GND →right arrow Arduino GND FC-51 OUT →right arrow Arduino Digital Pin 2 Arduino Example Code Absorb IR light
This article provides a detailed overview of the FC-51 IR sensor datasheet, including its technical specifications, pinout, working principle, and practical application examples. 1. FC-51 Sensor Technical Specifications
const int sensorPin = 2; // Pin connected to FC-51 OUT const int ledPin = 13; // Built-in LED void setup() pinMode(sensorPin, INPUT); pinMode(ledPin, OUTPUT); Serial.begin(9600); void loop() int sensorState = digitalRead(sensorPin); if (sensorState == LOW) // Obstacle detected digitalWrite(ledPin, HIGH); Serial.println("Obstacle Detected!"); else // Path clear digitalWrite(ledPin, LOW); Serial.println("Path Clear"); delay(100); Use code with caution.
If the reflected light is strong enough to pass the threshold, the LM393 pulls the OUT pin LOW and illuminates the green "Obstacle" LED. The Impact of Color and Material If no obstacle is present, the light radiates
FC-51 IR Proximity Sensor - am I doing it wrong? - Arduino Forum
Illuminates when an obstacle is detected within the set threshold.
The is a popular infrared (IR) obstacle avoidance sensor module commonly used in Arduino and robotics projects . It uses an IR transmitter (LED) and receiver (phototransistor) to detect objects within a specific range by measuring the reflection of infrared light. Technical Specifications