Fc 51 Ir Sensor Datasheet Jun 2026
By referencing this , you now have the complete technical picture: pinouts, voltage limits, range adjustment, code examples, and troubleshooting. Whether you’re building a line-following robot, a contactless switch, or a factory counter, the FC-51 offers a straightforward “detect or not detect” solution that integrates with almost any microcontroller.
A voltage comparator chip that processes the signal from the receiver to determine if an object is present. Fc 51 Ir Sensor Datasheet
Turning the onboard potentiometer clockwise usually the detection range (making it more sensitive). Counterclockwise decreases the range. This works by changing the comparator's reference threshold. By referencing this , you now have the
| 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 | | Symptom | Possible Cause | Solution |
Digital (High/Low). It typically outputs Low (0V) when an object is detected and High (VCC) when the path is clear. Detection Angle: Approximately 35°. Physical Components (The "Pieces")