Fc 51 Ir Sensor Datasheet !exclusive! (DELUXE ⇒)

⚠️ Some versions of FC-51 have only 3 pins (VCC, GND, OUT). The EN pin is optional.

The FC-51's 3.3V compatibility makes it a great choice for the Raspberry Pi ecosystem.

: 4.5/5

If the sensor fails to detect close objects, turn the potentiometer clockwise to increase sensitivity. Verify that your power supply provides a steady 3.3V to 5V.

These values assume a clean 5V supply with proper decoupling (a 100nF capacitor between VCC and GND near the module is recommended for noisy environments). Fc 51 Ir Sensor Datasheet

Understanding the physical board layout helps optimize the sensor for different environmental conditions. The LM393 Comparator IC

Illuminates only when an object reflects enough IR light to trigger the output threshold. If this LED is on, the OUT pin is driving a LOW signal. Working Principle and Physics ⚠️ Some versions of FC-51 have only 3

Connecting the FC-51 sensor to an Arduino is straightforward. FC-51 VCC -> Arduino 5V FC-51 GND -> Arduino GND FC-51 OUT -> Arduino Pin 2 Simple Arduino Code:

Digital TTL (Low level when an obstacle is detected, High level when clear) Onboard Comparator: LM393 chip for stable signal processing Dimensions: 32mm × 14mm Understanding the physical board layout helps optimize the

Suitable for obstacle detection at low to medium speeds (e.g., small robots, conveyor belts).

| Pin Name | Description | |----------|-------------| | | Power supply (3.3–5V) | | GND | Ground | | OUT | Digital output (0V when obstacle present, Vcc when no obstacle) | | EN | Enable pin (leave floating or pull HIGH to enable; LOW may disable) – not always present on all clones |