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Lesson 03: Flame Sensor Module

In this lesson, you will learn how to integrate a flame sensor with an Arduino board to detect the presence of fire. We will see how the flame sensor, when detecting a flame, triggers the Arduino’s built-in LED to light up and sends a warning message to the serial monitor. Conversely, in the absence of a flame, the LED stays off, and a different message is relayed to the monitor. This project is an excellent starting point for beginners, offering a comprehensive understanding of how to manage digital inputs and outputs on the Arduino platform. It provides a hands-on approach to learning about sensor integration and real-time response mechanisms in an Arduino-based system.

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
Arduino UNO R3 or R4	BUY
Flame Sensor Module	BUY

Wiring

../_images/Lesson_03_flame_module_circuit_uno_bb.png

Code

Code Analysis

The first line of code is a constant integer declaration for the flame sensor pin. We use the digital pin 7 to read the output from the flame sensor.
```
const int sensorPin = 7;
```

The setup() function initializes the flame sensor pin as an input and the built-in LED pin as an output. It also starts the serial communication at a baud rate of 9600 for printing messages to the serial monitor.

void setup() {
  pinMode(sensorPin, INPUT);     // Set the flame sensor pin as input
  pinMode(LED_BUILTIN, OUTPUT);  // Set the built-in LED pin as output
  Serial.begin(9600);            // Initialize the serial monitor at a baud rate of 9600
}

The loop() function is where we continuously check the status of the flame sensor. If the sensor detects a flame, the built-in LED is turned on and a message is printed to the serial monitor. If no flame is detected, the LED is turned off and a different message is printed. The process repeats every 100 milliseconds.

Note

You can change the threshold for detecting flames by adjusting the potentiometer on the flame sensor module.
```
void loop() {
  // Check if the sensor is detecting a fire
  if (digitalRead(sensorPin) == 0) {
    digitalWrite(LED_BUILTIN, HIGH);  // Turn on the built-in LED
    Serial.println("** Fire detected!!! **");
  } else {
    digitalWrite(LED_BUILTIN, LOW);  // Turn off the built-in LED
    Serial.println("No Fire detected");
  }
  delay(100);
}
```