How to Detect Fire with a Flame Sensor – KY-026

In this tutorial, you will learn how to detect fire with a flame sensor (KY-026) and an ESP32.

Parts Required

• ESP32
• KY-026
• Jumper wires

Circuit

Code

// lowest and highest sensor readings:
const int sensorMin = 0;     // sensor minimum
const int sensorMax = 1024;  // sensor maximum

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

void loop() {
  // read the sensor on analog A0:
	int sensorReading = analogRead(A0);
  // map the sensor range (four options):
  // ex: 'long int map(long int, long int, long int, long int, long int)'
	int range = map(sensorReading, sensorMin, sensorMax, 0, 3);
  
  // range value:
  switch (range) {
  case 0:    // A fire closer than 1.5 feet away.
    Serial.println("** Fogo Perto **");
    break;
  case 1:    // A fire between 1-3 feet away.
    Serial.println("** Fogo Longe **");
    break;
  case 2:    // No fire detected.
    Serial.println("Fogo Nao Detetado");
    break;
  }
  delay(1);  // delay between reads
}

References

[1] https://www.electronicshub.org/arduino-flame-sensor-interface/