Flame Monitor 4.0

Note

🌟 Welcome to the SunFounder Facebook Community! Whether you’re into Raspberry Pi, Arduino, or ESP32, you’ll find inspiration, help ideas here.

✅ Be the first to get free learning resources.
✅ Stay updated on new products & exclusive giveaways.
✅ Share your creations and get real feedback.

👉 Need faster updates or support? Click [here] join our Facebook community
👉 Or join our WhatsApp group: Click [here]

Kit purchase

Looking for parts? Check out our all-in-one kits below — packed with components, beginner-friendly guides, and tons of fun.

Name	Includes Arduino board	PURCHASE LINK
Ultimate Sensor Kit	Arduino Uno R4 Minima	BUY
Universal Maker Sensor Kit	×	BUY

Course Introduction

In this lesson, you’ll learn how to use a Flame Sensor, DC Motor, an I2C LCD Display, and the Arduino UNO R4 to monitor fire intensity. The LCD shows real-time readings, while buzzer provide sound alerts for different flame levels.

Note

If this is your first time working with an Arduino project, we recommend downloading and reviewing the basic materials first.

Required Components

In this project, we need the following components:

SN	COMPONENT INTRODUCTION	QUANTITY	PURCHASE LINK
1	Arduino UNO R4 Minima	1	BUY
2	USB Type-C cable	1
3	Breadboard	1	BUY
4	Wires	Several	BUY
5	Flame Sensor Module	1	BUY
6	Buzzer Modudle	1	BUY
7	I2C LCD 1602	1	BUY
8	TA6586 - Motor Driver Chip	1
9	DC Motor	1	BUY

Wiring

Common Connections:

Flame Sensor Module
- A0: Connect to A0 on the Arduino.
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
Buzzer Modudle
- I/O: Connect to 10 on the Arduino.
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
I2C LCD 1602
- SDA: Connect to A4 on the Arduino.
- SCL: Connect to A5 on the Arduino.
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
TA6586 - Motor Driver Chip
- BI: Connect to 6 on the Arduino.
- FI: Connect to 5 on the Arduino.
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
DC Motor
- GND: Connect to TA6586 B0.
- VCC: Connect to TA6586 F0.

Writing the Code

Note

You can copy this code into Arduino IDE.
To install the library, use the Arduino Library Manager and search for LiquidCrystal_I2C and install it.
Don’t forget to select the board(Arduino UNO R4 Minima) and the correct port before clicking the Upload button.

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Pin definitions
const int sensorPin = A0;       // Flame sensor analog pin
const int buzzerPin = 10;       // Buzzer pin

// TA6586 motor driver pins
const int fanFI = 5;            // TA6586 FI
const int fanBI = 6;            // TA6586 BI

// Threshold values
const int safeThreshold = 200;
const int dangerThreshold = 700;

// LCD object (address 0x27, 16 columns, 2 rows)
LiquidCrystal_I2C lcd(0x27, 16, 2);

int flameValue = 0;

enum FanState {
  FAN_STOP,
  FAN_LOW,
  FAN_HIGH
};

FanState currentFanState = FAN_STOP;

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

  lcd.init();
  lcd.backlight();

  pinMode(buzzerPin, OUTPUT);
  pinMode(fanFI, OUTPUT);
  pinMode(fanBI, OUTPUT);

  stopFan();

  // Startup screen
  lcd.setCursor(0, 0);
  lcd.print("Flame Monitor");
  lcd.setCursor(0, 1);
  lcd.print("Initializing");
  delay(1200);
  lcd.clear();
}

void loop() {
  // Read sensor value
  int rawValue = analogRead(sensorPin);

  // Convert to intuitive value
  flameValue = 1023 - rawValue;

  // Serial output for debugging
  Serial.print("Raw: ");
  Serial.print(rawValue);
  Serial.print("  Flame Value: ");
  Serial.print(flameValue);
  Serial.print("  Fan State: ");

  // Status detection
  if (flameValue < safeThreshold) {
    displayStatus("Status: Safe");
    noTone(buzzerPin);
    stopFan();
    Serial.println("STOP");
  }
  else if (flameValue < dangerThreshold) {
    displayStatus("Status: Warning");
    tone(buzzerPin, 800, 200);
    runFanLow();
    Serial.println("LOW");
  }
  else {
    displayStatus("Status: Danger");
    tone(buzzerPin, 1000, 400);
    runFanHigh();
    Serial.println("HIGH");
  }

  // Display value
  lcd.setCursor(0, 1);
  lcd.print("Value: ");
  lcd.print(flameValue);
  lcd.print("   ");   // Clear extra digits if needed

  delay(200);
}

// Function to display status on first row
void displayStatus(const char* text) {
  lcd.setCursor(0, 0);
  lcd.print("                ");
  lcd.setCursor(0, 0);
  lcd.print(text);
}

// Fan control functions
void stopFan() {
  if (currentFanState != FAN_STOP) {
    Serial.println("Executing stopFan()");
  }

  analogWrite(fanFI, 0);
  analogWrite(fanBI, 0);

  digitalWrite(fanFI, LOW);
  digitalWrite(fanBI, LOW);

  currentFanState = FAN_STOP;
}

void runFanLow() {
  if (currentFanState != FAN_LOW) {
    analogWrite(fanBI, 0);
    digitalWrite(fanBI, LOW);

    analogWrite(fanFI, 150);   // lower speed
    currentFanState = FAN_LOW;
  }
}

void runFanHigh() {
  if (currentFanState != FAN_HIGH) {
    analogWrite(fanBI, 0);
    digitalWrite(fanBI, LOW);

    analogWrite(fanFI, 255);   // full speed
    currentFanState = FAN_HIGH;
  }
}