Fc 51 Ir Sensor Datasheet Jun 2026

The operation of the FC-51 sensor is based on the principle of light reflection.

Power LED (Red) and Obstacle Detection LED (Green/Red depending on the manufacturer) Working Principle The FC-51 operates on the principle of infrared reflection.

To reliably detect objects at different distances, use the onboard potentiometer. Follow these steps:

Adjustable from 2cm to 30cm (some variants reach up to 80cm). Detection Angle: Approximately 35°. Fc 51 Ir Sensor Datasheet

GPIO.setmode(GPIO.BCM) SENSOR_PIN = 17 GPIO.setup(SENSOR_PIN, GPIO.IN)

When an object enters the detection range, the IR light reflects back.

Decreases sensitivity, requiring objects to be closer to the sensor to trigger an output. The operation of the FC-51 sensor is based

Before diving into the datasheet numbers, let's look at the physical interface. The FC-51 module typically has (although some variants have 4, with an extra analog output pin).

Do not force the potentiometer past its stops. Adjust only ±270 degrees typically.

The FC-51 is a highly popular, low-cost infrared (IR) obstacle avoidance sensor widely used in robotics, automation, and Arduino projects. It provides a simple digital output whenever an object enters its detection range. Follow these steps: Adjustable from 2cm to 30cm

The maximum current you can draw from the OUT pin is limited by the LM393's output stage. Do not connect the output directly to a heavy load (like a motor). Use a transistor or a microcontroller input.

Sunlight and incandescent bulbs emit massive amounts of infrared light, which can blind or saturate the IR receiver.