Product counting on assembly lines or presence detection.
Even a simple sensor like the FC-51 can exhibit issues. Here’s a troubleshooting guide:
You can find the FC-51 IR Sensor at retailers like Art of Circuits or DIY Electronics . Detecting obstacle with IR Sensor and Arduino
The FC-51 infrared (IR) obstacle avoidance sensor is a highly popular, low-cost electronic module used widely in robotics, automation, and DIY microcontroller projects. This comprehensive guide provides everything you need to know about the FC-51 sensor, including its technical specifications, pinout, working principle, schematic details, and how to interface it with microcontrollers like Arduino and Raspberry Pi. Overview of the FC-51 IR Sensor
Supports a flexible range from 3.0V to 6.0V , making it compatible with both 3.3V (Raspberry Pi/ESP32) and 5V (Arduino) systems. Fc 51 Ir Sensor Datasheet
Illuminates when the module is correctly powered.
The is a powerful yet simple tool for proximity and object detection. While it may lack the precision of a laser or the range of an ultrasonic sensor, its low cost, ease of use, and reliable digital output make it an ideal choice for thousands of hobbyist and educational projects.
For those integrating the FC-51 into time-critical applications (e.g., high-speed object counting), the following timing parameters are important:
The LM393 comparator processes this change against the threshold set by the potentiometer. Product counting on assembly lines or presence detection
The FC-51 module features a simple 3-pin interface header, making it exceptionally easy to connect to breadboards or microcontroller development boards. Pin Number Description Input Power Supply (3.3V - 5V DC) GND Ground Reference (0V) OUT Digital Output (Active LOW) Onboard Hardware Components
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Note: Values are typical for most generic modules. Always verify with your specific vendor.
The object is too dark (absorbs IR) or outside the 30cm limit. Detecting obstacle with IR Sensor and Arduino The
If no obstacle blocks the path, the light disperses, and the receiver detects nothing. When an object enters the detection range, the light bounces back toward the sensor.
A multi-turn potentiometer (blue trim pot) is used to increase (clockwise) or decrease (counter-clockwise) the sensitivity and detection distance. Operational Notes
If the obstacle LED stays on constantly, the sensitivity is set too high, or the sensor is pointing directly at a highly reflective surface. Turn the potentiometer counterclockwise to reduce sensitivity.
Because the sensor relies on light reflection, surface color and texture drastically impact performance:
Digital TTL level (Low logic when obstacle is detected) Output Drive Capability: Clean signal, greater than 15mA Dimensions: 32mm × 14mm Mounting Hole Size: 3mm (Screw diameter) Pinout Configuration