and observe the two on‑board LEDs:
The FC-51 is a popular, low-cost infrared proximity sensor used for obstacle detection in robotics. Specification 3.3V – 5.0V DC Operating Current ≥20is greater than or equal to 20 Detection Distance 2cm – 30cm (Adjustable via potentiometer) Detection Angle 35∘35 raised to the composed with power Output Type Digital signal (0 or 1) Output Level Low (0V) when obstacle detected; High (VCC) when clear IC Chip LM393 Comparator Pin Configuration VCC : External 3.3V-5V voltage. GND : External ground. OUT : Digital output interface (connects to MCU I/O). How it Works
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
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.
Proper calibration is essential for reliable operation. The FC‑51 includes a small that adjusts the detection threshold. and observe the two on‑board LEDs: The FC-51
The FC‑51 can be paired with an ESP8266 or ESP32 to send detection events to a cloud platform like Blynk, enabling remote alerts for door openings or package deliveries.
: When an object moves within the tuned detection zone, it bounces a portion of the IR energy back toward the module. OUT : Digital output interface (connects to MCU I/O)
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The is a versatile and cost-effective module for short-range obstacle detection. While it may run warm due to its active IR emission, managing the input voltage and sensitivity can ensure long-term reliability. By following the datasheet specifications, you can efficiently integrate this sensor into your robotics projects. If you'd like to dive deeper, I can provide: A sample Arduino sketch to get you started. A wiring diagram for a multi-sensor setup. Alternatives if you need a longer detection range.