To get a more comprehensive and technical overview, I will now open the most promising results. I will open the FC-51 page from elektronik-kompendium.de (result 0), the specifications page from electronics.com.bd (result 0), the leetechbd page (result 2), the Cirkit Designer tutorial (result 5), the "LEAP#806 FC-51 IR Obstacle Avoidance Sensor Module" (result 4), the "紅外線避障傳感器 FC-51 - BotSheet" (result 7), and the "Raspberry Pi Pico: Objekterkennung mit Infrarot-Reflektionssensor FC-51" (result 6). I will also open the "FC-51 Infrarot-Reflektionssensor" page (result 0) and the "IR Infrared 1 - 6mm Line Following Reflective Sensor Module - FC-51RA" (result 0) for comparison. sources provide a good amount of technical details, working principles, pinouts, calibration instructions, and application examples. I will also open the "IR Infrared 2 - 20cm Obstacle Detection Sensor Module FC-51" page from qqtrading.com.my (result 4) and the "FC-51 IR Distance Proximity Sensor Module" from circuitsnepal.odoo.com (result 8). sources provide a good amount of technical details, working principles, pinouts, calibration instructions, and application examples. I will now structure the article. The article will cover an introduction, technical specifications, pin configuration, working principle, calibration, interfacing, practical considerations, applications, pros and cons, and a conclusion. I will cite the sources appropriately. Understanding the FC-51 IR Sensor: A Comprehensive Datasheet and Application Guide
On some variants, the middle pin is VCC and the outer pin is OUT. Use a multimeter to confirm if unsure.
For engineers working on precise designs, here are the detailed electrical characteristics (typical at 25°C, VCC = 5V):
The FC-51 has a standard 3-pin male header (0.1" spacing). Beware: The pin order differs between some clones; always check your board's silkscreen.
Performance can be inconsistent under strong ambient light or sunlight, which may require shielding or recalibration of the sensitivity potentiometer. Fc 51 Ir Sensor Datasheet
The FC-51 IR sensor module is an electronic component used for non-contact object detection and proximity sensing. It serves as a reliable, low-cost digital sensor. This article consolidates its technical specifications, working principle, pin configuration, practical application circuits, and calibration procedures into a single reference. While an official manufacturer datasheet remains elusive, the information here is compiled from technical documentation, component datasheets, and practical experiments, making it an essential guide for engineers, students, and hobbyists alike.
The FC-51's simplicity and low cost make it suitable for a wide range of applications across robotics, automation, and education.
Supports a flexible range from 3.0V to 6.0V , making it compatible with both 3.3V (Raspberry Pi/ESP32) and 5V (Arduino) systems.
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 To get a more comprehensive and technical overview,
from machine import Pin import time
The infrared receiver tube accepts the reflected signal.
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delay(200); // Small delay to avoid flooding the serial monitor sources provide a good amount of technical details,
The module features a compact design, an onboard potentiometer for sensitivity adjustment, and a dual-indicator LED system (one for power, one for obstacle detection status). Key Technical Specifications
Absorb IR light. A pure matte black surface may not reflect enough light to trigger the sensor at all, a property frequently exploited in line-following robots where black tape represents a boundary line. Adjusting Sensitivity and Range
It is common to see the FC-51 and TCRT5000 compared, as both are IR-based reflective sensors. However, they are designed for different purposes. Here is a quick comparison:
Even a simple sensor like the FC-51 can exhibit issues. Here’s a troubleshooting guide: