Fire smoke detector project for kids

Overview

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);
  Serial.begin(9600);
}

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

  Serial.print("Pin A0: ");
  Serial.println(analogSensor);
  if (analogSensor > sensorThres)
  {
    digitalWrite(redLed, HIGH);
    digitalWrite(greenLed, LOW);
    tone(buzzer, 1000, 200);
  }
  else
  {
    digitalWrite(redLed, LOW);
    digitalWrite(greenLed, HIGH);
    noTone(buzzer);
  }
  delay(100);
}

Precautions

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.