Fire smoke detector project for kids

Fire smoke detector project for kids


This project deals with fire or smoke detection using a Gas Sensor which senses the threshold value for the smoke and gives input to the buzzer and LED’s accordingly.

In this smoke detector when the gas sensor detects a value greater than 300, the buzzer and LED – Red gets activated and if the value is less than 300 than the LED – Green will be activated.

Hardware required 

  1. Arduino Uno R3
  2. LED
  3. Resistor
  4. Jumper Wires
  5. Gas Sensor
  6. Buzzer

Schematic Diagram

Fig 1.  Circuit Diagram

Arduino Code :

int redLed = 12;
int greenLed = 11;
int buzzer = 10;
int smokeA0 = A5;
int sensorThres = 300;

void setup() {
  pinMode(redLed, OUTPUT);
  pinMode(greenLed, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(smokeA0, INPUT);

void loop() {
  int analogSensor = analogRead(smokeA0);

  Serial.print("Pin A0: ");
  if (analogSensor > sensorThres)
    digitalWrite(redLed, HIGH);
    digitalWrite(greenLed, LOW);
    tone(buzzer, 1000, 200);
    digitalWrite(redLed, LOW);
    digitalWrite(greenLed, HIGH);


  1. Connections should be done properly.
  2. Arduino is case Sensitive so code accordingly.
  3. Give different and appropriate colors to the wires.
  4. Use resistors for sensors and LED’s.

Do you have questions regarding our STEM program?

Contact us anytime.

Take your first step into the magical world of coding for kids


More Posts

Send Us A Message

Coding For kids

Coding Courses for Kids Online

Our courses which are tailored for grades 1 to 12, and our hands-on curriculum seamlessly integrates, preparing students for challenges and inspiring the next generation.


STEM LAB for Schools

If you are a school searching for a cutting-edge makerspace solution that goes beyond conventional education, look no further. Partner with Makers’ Muse to unlock a world of innovation and transformative learning experiences for your students. 

Coding Toys

STEM LAB for Schools

Discover a revolutionary coding journey for students with our cutting-edge educational toys. Partner with us to unlock innovative learning experiences that transcend traditional education.

Leave a Reply