Fc 51 Ir Sensor Datasheet Hot ~upd~ Jun 2026

Sample Arduino logic (pseudocode):

As they worked, they stumbled upon an obscure forum post from a robotics enthusiast who had encountered a similar problem. The user, 'ElectroGuru,' had shared a modified datasheet with additional thermal characteristics, which seemed to match the FC-51's behavior.

The FC-51 IR sensor is a popular, low-cost infrared proximity module widely used for obstacle avoidance in robotics and automated systems. It operates by emitting infrared light and measuring the reflection from nearby objects. Technical Specifications fc 51 ir sensor datasheet hot

If possible, power the sensor at 3.3V instead of 5V to reduce power consumption.

[Insert Link]

This code reads the digital state of the sensor. If it reads LOW (meaning an obstacle is detected), it turns on the Arduino's built-in LED and prints a message to the serial monitor.

The IR LED emits a 38kHz–56kHz modulated signal (though many clones use continuous IR). The phototransistor detects reflected IR from an obstacle. The LM393 comparator compares the phototransistor’s voltage to a reference voltage set by a (blue box on the board). When reflected IR exceeds the threshold, the output goes LOW. Sample Arduino logic (pseudocode): As they worked, they

: The IR LED casts light forward into a 35° arc.