Fc 51 Ir Sensor Datasheet 〈Tested & Working〉

int sensorPin = 2;
int ledPin = 13;

void setup() 
pinMode(sensorPin, INPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);



void loop() 
int sensorValue = digitalRead(sensorPin);
if (sensorValue == LOW)  // Obstacle detected
digitalWrite(ledPin, HIGH);
Serial.println("Obstacle!");
 else 
digitalWrite(ledPin, LOW);
delay(50);

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

The FC-51 IR Sensor: Your Robot’s Secret "Spidey Sense" Ever wondered how those clever little vacuum robots avoid tumbling down the stairs or crashing into your favorite vase? Most of the time, they’re using a "Spidey sense" powered by infrared light. At the heart of many beginner DIY projects is the FC-51 IR Obstacle Avoidance Sensor

, a tiny but mighty module that brings your creations to life.

If you’ve been hunting for the elusive "official" datasheet, you’ve probably noticed it's a bit like a ghost—everyone knows what it does, but the original manufacturer's document is hard to find. Here is the definitive breakdown of everything you need to know to master this sensor. 🛠️ Technical Specifications at a Glance Fc 51 Ir Sensor Datasheet

Think of the FC-51 as a digital gatekeeper. It doesn't tell you an object is; it just tells you something is there. distance with ir sensor fc-51 - Arduino Forum

The FC-51 IR Obstacle Avoidance Sensor is a popular and cost-effective module used widely in robotics for proximity detection and obstacle avoidance. It operates on the principle of infrared (IR) light reflection, utilizing an IR emitter and receiver pair alongside an LM393 comparator to provide a simple digital output. FC-51 IR Sensor Technical Specifications

The following technical data is derived from standard FC-51 datasheets:

Operating Voltage: 3.0V to 6.0V DC (Typically used at 3.3V or 5V). Current Consumption: ~23 mA at 3.3V. ~43 mA at 5.0V.

Detection Range: 2cm to 30cm (adjustable via onboard potentiometer). Detection Angle: ~35°.

Output Type: Digital (Logic 0 when an obstacle is detected, Logic 1 when clear). Dimensions: PCB Size: 3.1 cm x 1.4 cm. Overall: 4.5 cm x 1.4 cm x 0.7 cm. Pinout and Interface int sensorPin = 2; int ledPin = 13;

The module typically features a 3-pin male header for easy connection to microcontrollers like Arduino or Raspberry Pi: Description VCC Power Supply 3.3V - 5V DC input. GND Common ground connection. OUT Digital Output Goes LOW when an object reflects IR light. Working Principle

The FC-51 sensor contains two primary optical components: an IR Transmitter (LED) and an IR Receiver (Photodiode). FC-51 IR Proximity Sensor - am I doing it wrong?

Based on your request, here is the technical information and specification summary for the FC-51 Infrared Obstacle Avoidance Sensor Module.

This module is widely used in robotics (for line following or obstacle avoidance) and is based on the TCRT5000 IR sensor.

The FC-51 module works on the principle of reflective infrared sensing.

  • Digital Output: The resulting digital signal (0 or VCC) is sent to the OUT pin.

    • The following are the standard technical specifications for the FC-51 module. Please note that slight variations may occur between manufacturers. The operation of the FC-51 sensor is based

    | Parameter | Value | | :--- | :--- | | Operating Voltage | 3.3V – 5V DC | | Current Consumption | Approx. 20mA – 30mA | | Detection Distance | 2cm to 30cm (Adjustable) | | IO Interface | 4-pin (VCC, GND, OUT, EN*) | | Output Signal | Digital (TTL Low when object detected) | | Sensor Chip | LM393 Comparator | | IR Wavelength | 950 nm | | Effective Angle | Approx. 35° | | Dimensions | Approx. 32mm x 14mm | | Operating Temperature | 0°C to +50°C |

    *Note: The EN (Enable) pin is rarely populated on standard breakout boards; usually, the sensor is always enabled.

    | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | GND | Ground | | 2 | OUT | Digital output | | 3 | VCC | Power |

    How to identify: Look at the silkscreen on the PCB. Most modules are labeled "FC-51" and have pins marked as +, OUT, - or similar. Use a continuity tester to confirm ground connections.

    The FC-51 features a small, blue potentiometer (variable resistor) on the back of the PCB. Turning this potentiometer changes the comparator’s reference voltage, effectively adjusting the sensitivity.

    How to calibrate:

  • Stop turning when the output LED just turns ON (indicating detection). Remove the object; the LED should turn OFF.

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