Arduino UNO based fire and smoke (gas) detection system

An early warning system designed using Arduino UNO and a smoke sensor to detect fire hazards and trigger an immediate alarm.

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Arduino UNO based fire and smoke (gas) detection system

Things used in this project

Hardware components

Jumper wires (generic)

Seeed Studio Grove - Gas Sensor(MQ2)

SparkFun Solder-able Breadboard - Mini

LED (generic)

Buzzer

SparkFun Breadboard Power Supply Stick 5V/3.3V

Software apps and online services

Arduino IDE

Microsoft Visual Studio 2017

Story

In this project, implemented using an Arduino Uno board, we used a sensor that is sensitive to smoke, fire, and gas. The sensor values are read through analog pin A1. If the value from pin A1 is greater than 300 (which indicates the presence of smoke or gas — this threshold was determined using the Serial Monitor), pin 13 of the Arduino, which is connected to an LED and a buzzer, will be activated. Otherwise, pin 13 remains off. The sensor data is also printed through the serial port, allowing us to monitor the status of pin A1 at any given moment.

Gas code

void setup() { 
 pinMode(13, OUTPUT); 
 Serial.begin(9600); 
} 
 
void loop() { 
  int valA0 = analogRead(A0); 
  int valA1 = analogRead(A1); 
  Serial.print("A0: "); 
  Serial.print(valA0); 
  Serial.print(", A1: "); 
  Serial.println(valA1); 
  
  if (valA0 < 800 ||valA1 > 300) { 
    digitalWrite(13, HIGH); 
  } else { 
    digitalWrite(13, LOW); 
  } 
 
  delay(100); 
}