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| Feature | FC-51 (IR) | PIR (Passive IR) | |--------|-----------|------------------| | Detection | Short range, precise | Wide angle, up to 7m | | Sensitivity to small objects | Yes (finger, card) | No (needs body heat) | | Works in complete darkness | Yes (active IR) | Yes (thermal) | | Best for | Gesture, proximity, line | Occupancy, intruder alerts |
2cm – 30cm (adjustable via the onboard potentiometer). Detection Angle: 35°.
Apply power to the system ( and GND ). The power indicator LED will light up immediately.
Detecting items passing on a conveyor belt. Proximity Sensors: Automatic doors or faucets. fc 51 ir sensor datasheet hot
IR Infrared Obstacle Avoidance Sensor Module | FC-51 for Arduino
Ensure connects directly to the 5V or 3.3V pin on your Arduino. Ensure GND connects directly to an Arduino GND pin. Step 3: Isolate the Output Load
Emits IR light using an IR LED and detects reflections using a photodiode. | Feature | FC-51 (IR) | PIR (Passive
The is currently one of the most searched components for hobbyist robotics. Known for its low cost and ease of use, this module is essential for collision detection systems.
The detection range can be finely tuned via the on-board potentiometer, adjusting the reference threshold on the LM393 comparator:
: The IR LED casts light forward into a 35° arc. The power indicator LED will light up immediately
Emits an infrared beam at a specific frequency (usually 950nm).
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| Temperature (by touch) | Status | |------------------------|--------| | | Normal under 7–12V operation. | | Hot (~60–70°C) | Tolerable for short periods. Check your current. | | Too hot to touch (>75°C) | Likely a short, wrong voltage (>12V), or defective clone. |
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Different reflectivity. Dark surfaces absorb IR. Increase potentiometer sensitivity (turn counter-clockwise). Do this after the sensor is thermally stable.