Connect the FC-51 sensor to an Arduino board using the following pin map: →right arrow Arduino 5V or 3.3V GND →right arrow Arduino GND OUT →right arrow Arduino Digital Pin 2 Sample Arduino Code
/* FC-51 IR Sensor Obstacle Avoidance Demo Outputs status to the Serial Monitor and lights up the built-in LED. */ const int IR_PIN = 2; // Connect FC-51 OUT to digital pin 2 const int LED_PIN = 13; // Use the onboard Arduino LED void setup() pinMode(IR_PIN, INPUT); // Set the sensor pin as an input pinMode(LED_PIN, OUTPUT); // Set the onboard LED as an output Serial.begin(9600); // Initialize serial communication Serial.println("FC-51 IR Sensor Initialized."); void loop() int sensorStatus = digitalRead(IR_PIN); // Read the digital output of FC-51 // Remember: FC-51 outputs LOW when an obstacle is detected if (sensorStatus == LOW) digitalWrite(LED_PIN, HIGH); // Turn on the onboard LED Serial.println("Obstacle Detected!"); else digitalWrite(LED_PIN, LOW) ; // Turn off the onboard LED Serial.println("Path Clear..."); delay(100); // Small delay to prevent serial flooding Use code with caution. Interfacing FC-51 with Raspberry Pi
The FC-51 IR sensor has some limitations:
If the reflected signal is strong enough (meaning an object is close), the comparator pulls the Output (OUT) pin LOW . Distance Adjustment Fc 51 Ir Sensor Datasheet
The FC-51 module utilizes an infrared transmitter (IR LED) and an infrared receiver (Photodiode) mounted side-by-side.
The FC-51 is a digital infrared proximity sensor. It detects obstacles by emitting an infrared signal and sensing the reflected light. It features low power consumption, a small form factor, and simple digital output interface. Key Applications Obstacle avoidance for smart cars and AGVs. Automation: Object counting on conveyor belts. Security: Proximity alarms and boundary detection. Smart Home: Touchless switches and faucet controllers. 2. Technical Specifications
Understanding the FC-51 IR Obstacle Avoidance Sensor: A Complete Datasheet and Integration Guide Connect the FC-51 sensor to an Arduino board
The FC-51 is an active infrared proximity sensor. The module consists of a paired infrared transmitter (IR LED) and an infrared receiver (photodiode), alongside an onboard voltage comparator circuit. How it Works:
Below are the in-depth technical specifications, pinout architecture, and critical operating limitations mapped directly from its standard industrial datasheet footprint. 📊 Core Technical Specifications
2 cm to 30 cm (Subject to target reflectivity) Effective Detection Angle: ~35° field of view Distance Adjustment The FC-51 module utilizes an infrared
Note: Some variants include a fourth pin labeled . When EN is grounded or left disconnected, the sensor is active. When pulled HIGH, the sensor enters a low-power standby mode. Onboard Components and Calibration
The following sketch reads the digital state of the FC-51 sensor and prints the status to the Serial Monitor. It also illuminates the built-in Arduino LED (Pin 13) when an obstacle is detected.
+-------------------+ | [FC-51 Module] | | | | [VCC] [GND] [OUT]| +----+-----+-----+--+ | | |
Direct sunlight or heavy incandescent lighting contains large amounts of infrared radiation. This can flood the photodiode and cause false triggers. For outdoor use, shield the sensor housing from direct sunlight. Common Applications