Arduino: How to use KY-026 Flame Sensor Module

				
					const int DIGITAL_PIN = 7; // D0 Output
const int ANALOG_PIN = A0; // A0 Output
const int LED_PIN = 13;    // Built-in LED

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(DIGITAL_PIN, INPUT);
  Serial.begin(9600);
  Serial.println("KY-026 Flame Sensor Ready! Calibrate Digital Threshold.");
}

void loop() {
  // 1. Read Analog State (A0)
  // Raw 0-1023 value. Value is typically HIGH when far from a flame (low IR).
  // Value drops LOW when IR intensity increases (near a flame).
  int analogValue = analogRead(ANALOG_PIN);

  // 2. Read Digital State (D0)
  // We assume HIGH means flame detected (Active HIGH logic).
  // NOTE: Some modules are Active LOW. Test yours and adjust the code below.
  int digitalState = digitalRead(DIGITAL_PIN);

  // Control LED based on Digital Output (Alarm Trigger)
  // Assuming Active HIGH logic (LOW when clear, HIGH when triggered)
  if (digitalState == HIGH) {
    digitalWrite(LED_PIN, HIGH); // Turn LED ON (FLAME DETECTED)
  } else {
    digitalWrite(LED_PIN, LOW);  // Turn LED OFF
  }

  // Print both outputs to the Serial Monitor
  Serial.print("Analog (A0 - IR Intensity): ");
  Serial.print(analogValue);
  Serial.print(" | Digital State (D0): ");
 
  if (digitalState == HIGH) {
    Serial.println(">>> FLAME DETECTED (HIGH) <<<");
  } else {
    Serial.println("CLEAR (LOW)");
  }
 
  delay(100);
}