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Lesson 03: Flame Sensor Module

In this lesson, you will learn how to connect a flame sensor to an ESP32 Development Board for fire detection. We’ll examine the sensor’s response to fire and how it triggers a warning message. This project is ideal for beginners working with sensors and ESP32, providing hands-on experience in monitoring environmental factors using basic electronic components.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
ESP32 & Development Board (ESP32 Board)	BUY
Flame Sensor Module	BUY
Breadboard	BUY

Wiring

Code

Code Analysis

1. Defining the Sensor Pin:

   The pin to which the flame sensor is connected is defined as an integer constant.

   const int sensorPin = 25;
   

2. Setup Function:

   This function runs once when the ESP32 starts. It initializes the sensor pin as an input and begins serial communication at 9600 baud rate for output.

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

3. Loop Function:

   The core of the program, it continuously checks the state of the flame sensor. If the sensor detects a flame (returns 0), it prints a fire alert message. Otherwise, it indicates no fire is detected. The check happens every 100 milliseconds.

   void loop() {
     if (digitalRead(sensorPin) == 0) {
       Serial.println("** Fire detected!!! **");
     } else {
       Serial.println("No Fire detected");
     }
     delay(100);
   }