The most frequent cause of a burning hot FC-51 is accidentally swapping the power pins. The module has three pins: VCC, GND, and OUT.
The FC-51 shines in low-cost, high-engagement installations where tactile buttons would be boring or unhygienic.
delay(500); // Cool-down period
If your sensor is running hot to the touch, it is likely due to one of the following "hot" issues: fc 51 ir sensor datasheet hot
Use a digital multimeter to measure the actual voltage across the VCC and GND pins of the sensor while it is powered. Ensure the reading stays strictly between . If you are using an external power supply or battery pack, implement a 5V voltage regulator (such as an LM7805) to stabilize the input. Step 3: Test for Internal Damage
If you accidentally connect the OUT pin directly to the VCC rail or GND without a load, or if your microcontroller pin is incorrectly configured as an output driving an opposing voltage, it creates a short circuit.
Do not calibrate the potentiometer at power-up. Let the sensor run idle (with IR LED active) for 15 minutes, then adjust the blue trimmer for the desired range. This “hot calibration” ensures thermal equilibrium. The most frequent cause of a burning hot
The module features a 3-pin male header interface alongside two onboard LEDs:
📂 [Insert Link]
void setup() pinMode(2, INPUT); // Correct configuration Use code with caution. delay(500); // Cool-down period If your sensor is
✅ The LM393 can run up to 125°C junction temp, but the plastic case and nearby components degrade faster above 80°C.
Emits IR light using an IR LED and detects reflections using a photodiode.
The onboard IR LED emits infrared light at a specific frequency.
An is almost always caused by a reversed power supply connection (wiring VCC to GND and vice versa), or an overvoltage exceeding its maximum