Fc 51 Ir Sensor Datasheet Hot -

If you feed the module 7V–12V (common for Arduino projects), the regulator must drop the excess voltage as heat.

Example:
Input = 9V, Output = 5V, Current draw = 50 mA
Power dissipated = (9V – 5V) × 0.05A = 0.2 Watts
In a small SOT-23 package, that’s noticeably warm (~40–50°C). fc 51 ir sensor datasheet hot

A: Poorly. Sunlight contains strong IR. The sensor will run hot and false-trigger constantly. Add a physical hood or switch to a modulated IR sensor (TSOP series). If you feed the module 7V–12V (common for

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. Sunlight contains strong IR

There is no single “official” FC-51 datasheet from one manufacturer (it’s a generic design). However, the key components have public datasheets:

The FC-51 is a widely used infrared (IR) obstacle/line-detection module that integrates an IR emitter and receiver with signal conditioning and often a potentiometer for sensitivity adjustment. It’s popular in hobbyist robotics, line-followers, proximity detection, and simple object-sensing applications.