Flame Sensor with Arduino

Keep an eye on a candle you have burning or a fireplace!

Written By: Cherie Tan

Difficulty

Easy

Steps

Flame sensors can detect flame and infrared light sources.

In this guide, you will learn how to use a flame sensor module with the Arduino. The flame sensor can be used to keep an eye on a candle you have burning or a fireplace.

Completing this guide will enable you to monitor a project or as a safety precaution to cut a device on or off.

Step 1 Connect Arduino 5V to the Flame Sensor

Connect Arduino 5V to the Flame Sensor.

Step 2 Connect Ground to the Flame Sensor

Connect Ground to the Flame Sensor.

Step 3 Connect Analogue 0 to the Module

Connect Analogue 0 to the Flame Sensor.

Step 4 Code for the Flame Sensor

const int sensorMin = 0;     // sensor minimum
const int sensorMax = 1024;  // sensor maximum

void setup() {
  Serial.begin(9600);
}
void loop() {
  int flameSensor = analogRead(A0);
  int range = map(flameSensor, sensorMin, sensorMax, 0, 3);

  // range value:
  switch (range) {
  case 0:
    Serial.println("Fire within 40cm");
    break;
  case 1:    // A fire between 1-3 feet away.
    Serial.println("Fire between 40cm - 1m");
    break;
  case 2:    // No fire detected.
    Serial.println("No Fire");
    break;
  }
  delay(1000);  // 1 second be
}

Copy the code and upload it in the IDE.

Open the Serial Monitor

The sensor will detect the IR wavelengths given off by the flames.

Step 5 Test your Flame Sensor with a Flame!

This part of the guide should be done under Adult Supervision!

Test your Flame Sensor with a Flame!