Introduction

The 4-PIN IR Flame Sensor is a specialized module that detects infrared light emitted by flames in the 760nm-1100nm wavelength range. This compact sensor provides both digital and analog outputs, making it ideal for fire detection systems, smart home devices, and robotics projects.

Key Features

Technical Specifications

Pin Configuration

Wiring with Arduino

// Basic Connections:
// VCC → 5V
// GND → GND
// DO  → D2 (Digital Input)
// AO  → A0 (Analog Input)

// For best results, position sensor 30-50cm from detection area

Basic Digital Detection

// Digital Output Example
const int flameDigital = 2;

void setup() {
  pinMode(flameDigital, INPUT);
  Serial.begin(9600);
}

void loop() {
  if (digitalRead(flameDigital) {
    Serial.println("Flame detected!");
    // Add your response code here
  }
  delay(100);
}

Analog Flame Intensity

// Analog Output Example
const int flameAnalog = A0;

void setup() {
  Serial.begin(9600);
}

void loop() {
  int sensorValue = analogRead(flameAnalog);
  Serial.print("Flame intensity: ");
  Serial.println(sensorValue);
  
  if (sensorValue > 500) {  // Adjust threshold as needed
    Serial.println("Danger! Strong flame detected");
  }
  delay(200);
}

Advanced Applications

// Automatic baseline calibration
int baseline = 0;

void calibrate() {
  for(int i=0; i<10; i++) {
    baseline += analogRead(A0);
    delay(100);
  }
  baseline = (baseline/10) + 50; // Add safety margin
}

// Visual flame alert
void loop() {
  int val = analogRead(A0);
  if(val > baseline) {
    digitalWrite(LED_PIN, HIGH);
    tone(BUZZER_PIN, 1000, 500);
  } else {
    digitalWrite(LED_PIN, LOW);
  }
}

// ESP8266 WiFi Alert
if(analogRead(A0) > threshold) {
  WiFiClient client;
  if(client.connect(server, 80)) {
    client.print("GET /alert?flame=detected");
  }
}

// Fire-fighting robot
if(digitalRead(FLAME_PIN)) {
  stopMotors();
  activateWaterPump();
  delay(3000);
}

Troubleshooting