Fc 51 Ir Sensor Datasheet Hot May 2026

Introduction The FC-51 is a low-cost, versatile infrared (IR) obstacle avoidance sensor module widely used in robotics and automation projects. It is designed to detect objects at short distances without physical contact. Commonly utilized in line-following robots, obstacle-avoiding vehicles, and interactive installation art, the FC-51 offers a simple digital output that makes it easy to interface with microcontrollers like Arduino, ESP32, and Raspberry Pi.

This article provides a breakdown of the sensor's specifications, working principles, and integration guidelines based on standard technical data.

The heat typically comes from two culprits: fc 51 ir sensor datasheet hot

Cover each FC-51 with a colored plastic dome. When a player’s hand covers a dome, the sensor detects the reflection drop and lights up an LED. Build a “reaction time” game with just an Arduino and a few sensors.

If you feed the module 7V–12V (common for Arduino projects), the regulator must drop the excess voltage as heat. Introduction The FC-51 is a low-cost, versatile infrared

Example:
Input = 9V, Output = 5V, Current draw = 50 mA
Power dissipated = (9V – 5V) × 0.05A = 0.2 Watts
In a small SOT-23 package, that’s noticeably warm (~40–50°C).

Pair the sensor with a micro-servo. Wave your hand over a small waste bin, and the lid opens automatically. No voice assistants, no Wi-Fi—just instant, low-power convenience. The heat typically comes from two culprits :

The LM393 comparator, while low-power, still dissipates energy. At 5V and 40mA, the module consumes 0.2W. This is not much, but the FC 51 has no thermal relief. The small PCB, lack of a ground plane, and proximity of the potentiometer to the LM393 cause localized heating.

A: Without heatsink: 20% duty cycle (on for 1 sec, off for 4 sec). With active cooling: 70% duty cycle.