to process signals from its IR transmitter (LED) and receiver (photodiode). Art of Circuits Key Technical Specifications Specification Operating Voltage 3.0V – 6.0V DC Detection Range 2cm – 30cm (Adjustable) Detection Angle Output Type Digital (Low: Obstacle detected, High: No obstacle) Current Consumption ~43mA (Active) PCB Dimensions 3.1 cm x 1.4 cm Operation and Calibration Sensitivity Adjustment : The onboard potentiometer (trimmer) allows you to set the detection range. : Increases the detection distance. Counter-clockwise : Reduces the detection distance. LED Indicators : Lights up when the module is connected to power. Signal/Obstacle LED
while True: if sensor.value() == 0: # Check if output is LOW (obstacle detected) led.value(1) # LED ON print("Obstacle detected!") else: led.value(0) # LED OFF time.sleep(0.1)
The FC‑51 shines when you simply need to know and your operating environment is indoors or protected from direct sunlight. fc 51 ir sensor datasheet hot
: The most frequent cause of overheating is connecting VCC and GND in reverse. Power Overload : Using a power source higher than the rated 3.0V – 6.0V can cook the onboard LM393 Comparator IC Faulty IR Receiver
FC-51 IR Obstacle Avoidance Sensor is a digital infrared proximity module used primarily in robotics for object detection. It uses an LM393 voltage comparator to process signals from its IR transmitter (LED)
What is wired directly to the sensor's OUT pin?
Small footprint with a 3mm screw hole for easy mounting on robot chassis. Technical Specifications Specification Operating Voltage 3.3V to 5V DC Detection Distance 2cm to 30cm (Adjustable via potentiometer) Detection Angle Output Type Digital Logic (Low = Object detected, High = No object) IC Controller LM393 Voltage Comparator Current Consumption Pin Configuration The module typically features a 3-pin header: VCC: Connects to power (3.3V - 5V). GND: Connects to the common ground. OUT: Digital output pin connected to the microcontroller. Typical Applications Counter-clockwise : Reduces the detection distance
Sample Arduino logic (pseudocode):
from machine import Pin import time
