led_onboard = Pin(25, Pin.OUT, value=0)
What or hardware platform you are using (e.g., ESP32, Raspberry Pi, PIC )
Happy sensing!
Even a simple sensor like the FC-51 can exhibit issues. Here’s a troubleshooting guide: Fc 51 Ir Sensor Datasheet
Smooth, glossy surfaces offer specular reflection, producing consistent detection. Rough, matte, or transparent objects scatter or pass light through, drastically hurting accuracy.
Emits infrared light at a specific frequency (usually 950nm).
The FC-51 is an infrared (IR) proximity sensor module widely used for obstacle avoidance in robotics and automation. It works by emitting an infrared beam and detecting its reflection off a nearby object. led_onboard = Pin(25, Pin
Digital signal (LOW when an obstacle is detected, HIGH when clear) Onboard IC: LM393 Dual Differential Comparator Dimensions: 3.2cm × 1.4cm Mounting Hole Size: 3mm (for easy chassis installation) Pin Configuration and Functionality
The FC-51 IR sensor boasts several key features that make it an attractive choice for various applications:
Detects reflected infrared light. It is tinted black to filter out ambient visible light interference. Rough, matte, or transparent objects scatter or pass
If the reflected signal strength exceeds the threshold, the LM393 trips, turning on the onboard indicator LED and pulling the OUT pin LOW (0V) . When the path is clear, the OUT pin remains HIGH (VCC) via an internal pull-up resistor. Important Limitation: Surface Color Reflection
The FC-51 is very straightforward to use with any Arduino board.
2cm to 30cm (Adjustable via onboard potentiometer) Detection Angle: 35 degrees
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.
Based on the FC-51 IR Sensor Overview , the core technical data is as follows: 3.3V to 5V DC.