The IR LED itself draws 10–20mA continuous. In many non-modulated FC 51 clones, the LED stays ON permanently, heating the PCB. Combined with ambient heat (e.g., near a motor driver), the entire sensor drifts out of calibration within minutes.
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Connect four FC-51 sensors in an arc. Wave left → previous track. Wave right → next track. Wave up → volume up. Wave down → pause. It’s a magical way to control a party playlist without touching a screen. The IR LED itself draws 10–20mA continuous