The FC-51 is built around the LM393 voltage comparator and an active infrared sensor pair. Below are the critical technical parameters:
Pin Configuration:
Introduction The FC-51 is a low-cost, versatile infrared (IR) obstacle avoidance sensor module widely used in robotics and automation projects. It is designed to detect objects at short distances without physical contact. Commonly utilized in line-following robots, obstacle-avoiding vehicles, and interactive installation art, the FC-51 offers a simple digital output that makes it easy to interface with microcontrollers like Arduino, ESP32, and Raspberry Pi. fc 51 ir sensor datasheet hot
This article provides a breakdown of the sensor's specifications, working principles, and integration guidelines based on standard technical data.
A: Different reflectivity. Dark surfaces absorb IR. Increase potentiometer sensitivity (turn counter-clockwise). Do this after the sensor is thermally stable. The FC-51 is built around the LM393 voltage
Arrange several FC-51 sensors across a hallway. When a player breaks an IR beam (by walking through), a buzzer sounds or a counter increments. It’s a family-friendly alternative to laser tag for birthday parties.
If the “hot” problem is killing your project, consider these drop-in alternatives. Pin Configuration:
| Sensor | Thermal Drift | Max Range | Typical Cost | | :--- | :--- | :--- | :--- | | FC 51 (original) | High (poor) | 30 cm | $2 | | FC 51 with modulation | Medium | 40 cm | $3 | | SHARP GP2Y0A21 (analog) | Low (compensated) | 80 cm | $12 | | VL53L0X (ToF laser) | Very low | 200 cm | $8 | | HC-SR04 (ultrasonic) | Negligible | 400 cm | $4 |
Recommendation: For continuous operation or outdoor robots, switch to ultrasonic or Time-of-Flight. The FC 51 is best for intermittent sensing (< 10% duty cycle).
The FC-51 provides a Digital Output, meaning it does not provide analog distance data (e.g., "object is 15cm away"). It only provides a binary state: Obstacle Detected or No Obstacle.