If you are stuck with the FC 51 but need stable performance, apply these fixes.
The blue trimmer pot is carbon-track, which changes resistance with temperature. A 10°C rise can shift the threshold by 5–10%, altering the detection range. This is why your robot might detect at 15cm when cold, but only 8cm when hot.
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 fc 51 ir sensor datasheet hot
The digital output (OUT) pin is designed to send a low-current signal to a microcontroller GPIO pin.
: A short circuit inside the IR receiver component itself can cause it to burn. FC-51 Technical Specifications If you are stuck with the FC 51
If you are planning to use this for a project, would you like a snippet or a circuit wiring diagram to get started?
The module features a standard 3-pin or 4-pin interface, making it highly breadboard-compatible. Description Connects to 3.3V - 5V power supply GND Connects to power supply ground OUT Digital output interface (Connect to MCU I/O) EN (Optional) Active low; sensor works when grounded Why is Your FC-51 IR Sensor Getting Hot? This is why your robot might detect at
Operating the sensor at 5V instead of 3.3V dramatically increases power consumption (43mA vs 23mA). While 5V is allowed, it leads to faster heating of the IR transmitter LED and the LM393 chip. B. High Potentiometer Sensitivity
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