Fc 51 Ir Sensor Datasheet -

| 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 | How does the FC-51 stack up against common alternatives?

void loop() sensorState = digitalRead(sensorPin); Fc 51 Ir Sensor Datasheet

Keep ambient IR low, adjust the potentiometer for your target reflectivity, and always confirm the pinout before powering up. | Symptom | Possible Cause | Solution |

However, finding a consolidated, detailed datasheet for the FC-51 can be challenging. Many sellers provide only basic pinouts, leaving users to guess at critical specifications like current consumption, detection range, and timing characteristics. Many sellers provide only basic pinouts, leaving users

if (sensorState == LOW) // Object detected digitalWrite(ledPin, HIGH); Serial.println("Object Detected!"); else // No object digitalWrite(ledPin, LOW);