If you find the detection range is too short (e.g., under 10cm), try . Pushing them slightly closer or ensuring they are perfectly parallel can sometimes improve the range up to 30cm.
Photodiode that detects reflected infrared light.
Triggers automatic water faucets, hand sanitizers, or paper towel dispensers when hands approach. Limitations and Troubleshooting
Disclaimer: Specifications may vary slightly between manufacturers. Always test your specific module with a multimeter before integrating into a final design. Fc 51 Ir Sensor Datasheet
The FC-51 module integrates several key components on a single printed circuit board (PCB):
: 4.5/5
What you are using (Arduino, ESP32, Raspberry Pi)? What is your target obstacle material ? If you find the detection range is too short (e
Note: Turning the potentiometer too far clockwise will cause the sensor to lock into a permanent "LOW" state, indicating an obstacle even when the path is completely clear. Interfacing FC-51 with Arduino
If you are looking for specific or advanced calibration techniques for the FC-51 sensor, let me know! I can also help you compare it with ultrasonic sensors for your specific application.
The LM393 voltage comparator compares the voltage from the photodiode against a reference voltage set by the potentiometer. Triggers automatic water faucets, hand sanitizers, or paper
[FC-51 Module] [Obstacle] +------------------+ | IR Transmitter | ------ (IR Light) ------> | | (Clear LED) | | | | | | IR Receiver | <--- (Reflected Light) -- | | (Black PD) | +------------------+
The module features an onboard IR transmitter (a clear IR LED) that continuously emits a beam of infrared light.
Digital signal (TTL level). It outputs a Low logic level when an obstacle is detected and a High level when the path is clear.
As mentioned, black objects drastically reduce the effective range. Test your system using the exact materials the sensor will encounter in production.
