The is a compact, active infrared module designed for obstacle avoidance and proximity detection. It operates by emitting a beam of infrared light; if an object is within its path, the light reflects back to a photodiode receiver, triggering a digital output. Core Technical Specifications
The FC-51 IR sensor is a compact, low-cost infrared sensor module that detects infrared radiation. It consists of an infrared emitter and receiver pair, which work together to detect obstacles or objects within a certain range. The sensor is commonly used in robotics, automation, and electronics projects for tasks such as obstacle detection, line following, and object tracking. fc 51 ir sensor datasheet hot
The onboard LM393 comparator compares the intensity of the received signal with the threshold set by the potentiometer. The is a compact, active infrared module designed
Ensure the sensor isn't pointed at a nearby surface (like a table) continuously. 4. How to Use FC-51 with Arduino It consists of an infrared emitter and receiver
The reflective IR principle works very well for distinguishing between white and black surfaces. A robot equipped with FC‑51 modules can follow a dark line on a light background.
2cm to 30cm (Adjustable via onboard potentiometer) Detection Angle: 35°
| Feature | FC-51 (IR) | PIR (Passive IR) | |--------|-----------|------------------| | Detection | Short range, precise | Wide angle, up to 7m | | Sensitivity to small objects | Yes (finger, card) | No (needs body heat) | | Works in complete darkness | Yes (active IR) | Yes (thermal) | | Best for | Gesture, proximity, line | Occupancy, intruder alerts |