Extinguisher

Note

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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
Elite Explorer Kit	Arduino Uno R4 WiFi	BUY
3 in 1 Ultimate Starter Kit	Arduino Uno R4 Minima	BUY

Course Introduction

In this lesson, you’ll use two servo motors, a Flame Sensor Module, a water pump driven by an L9110 motor driver, and Arduino to create a tracking fire extinguisher system.

The servos continuously scan the area with the flame sensor and water pump. When a flame is detected, the pump automatically activates to spray water toward the detected direction, creating a simple fire tracking and extinguishing effect.

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 WIFI	1	BUY
2	USB Type-C cable	1
3	Breadboard	1	BUY
4	Wires	Several	BUY
5	Power Supply	1	BUY
6	Digital Servo Motor	2	BUY
7	L9110 Motor Driver Module	1
8	Centrifugal Pump	1
9	Flame Sensor Module	1	BUY

Wiring

Common Connections:

Digital Servo Motor (flame)
- Connect to breadboard’s positive power bus.
- Connect to breadboard’s negative power bus.
- Connect to 9 on the Arduino.
Digital Servo Motor (pump)
- Connect to breadboard’s positive power bus.
- Connect to breadboard’s negative power bus.
- Connect to 10 on the Arduino.
L9110 Motor Driver Module
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
- A-1A: Connect to 5 on the Arduino.
- A-1B: Connect to 6 on the Arduino.
Centrifugal Pump
- Connect to L9110 Motor Driver Module MOTOR A.
- Connect to L9110 Motor Driver Module MOTOR A.
Flame Sensor Module
- D0: Connect to 2 on the Arduino.
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.

Writing the Code

Note

You can copy this code into Arduino IDE.
Don’t forget to select the board(Arduino UNO R4 Minima/WIFI) and the correct port before clicking the Upload button.

#include <Servo.h>

// Servo pins
const int FLAME_SERVO_PIN = 9;
const int PUMP_SERVO_PIN = 10;

// Flame sensor pin
const int FLAME_PIN = 2;

// L9110 motor driver pins
const int PUMP_IN1 = 5;
const int PUMP_IN2 = 6;

// Servo objects
Servo flameServo;
Servo pumpServo;

// Servo scan settings
const int SCAN_LEFT = 45;
const int SCAN_RIGHT = 135;
const int SCAN_STEP = 2;
const int SERVO_DELAY = 30;

// Flame sensor logic
// Most flame sensor modules output LOW when flame is detected.
// If your module works the opposite way, change LOW to HIGH.
const int FLAME_DETECTED_STATE = LOW;

int currentAngle = SCAN_LEFT;
int direction = 1;

void pumpOn() {
  digitalWrite(PUMP_IN1, HIGH);
  digitalWrite(PUMP_IN2, LOW);
}

void pumpOff() {
  digitalWrite(PUMP_IN1, LOW);
  digitalWrite(PUMP_IN2, LOW);
}

void setup() {
  pinMode(FLAME_PIN, INPUT);
  pinMode(PUMP_IN1, OUTPUT);
  pinMode(PUMP_IN2, OUTPUT);

  flameServo.attach(FLAME_SERVO_PIN);
  pumpServo.attach(PUMP_SERVO_PIN);

  flameServo.write(currentAngle);
  pumpServo.write(currentAngle);

  pumpOff();
}

void loop() {
  int flameState = digitalRead(FLAME_PIN);
  bool flameDetected = (flameState == FLAME_DETECTED_STATE);

  flameServo.write(currentAngle);
  pumpServo.write(currentAngle);

  if (flameDetected) {
    pumpOn();
  } else {
    pumpOff();

    currentAngle += direction * SCAN_STEP;

    if (currentAngle >= SCAN_RIGHT) {
      currentAngle = SCAN_RIGHT;
      direction = -1;
    }

    if (currentAngle <= SCAN_LEFT) {
      currentAngle = SCAN_LEFT;
      direction = 1;
    }
  }

  delay(SERVO_DELAY);
}