Iot based fire alarm system

Through this tutorial I made fire alarm notification System Using Iot technology. wherever you are in the world you can get the notification

BeginnerFull instructions provided2,258

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board

Seeed Studio Grove - Gas Sensor(MQ2)

UTSOURCE Electronic Parts

Breadboard (generic)

Jumper wires (generic)

Male/Female Jumper Wires

Software apps and online services

Arduino IDE

Blynk

Story

The MQ-2 smoke sensor is sensitive to smoke and to the following flammable gases:

LPG
Butane
Propane
Methane
Alcohol
Hydrogen

The resistance of the sensor is different depending on the type of the gas.

The smoke sensor has a built-in potentiometer that allows you to adjust the sensor digital output (D0) threshold. This threshold sets the value above which the digital pin will output a HIGH signal

From my previous tutorial I made Arduino based Smoke detection system. Here, I have made IOT based Smoke detection notification system through your smart phone using Node Mcu and Blynk app

Thanks UTSOURCE.net to offer electronic components for my projects

Connections:

VCC pin of MQ-2 is connected to 3V pin of NodeMCU.
GND pin of MQ-2 is connected to GND pin of NodeMCU.
A0 pin of MQ-2 is connected to A0 pin of NodeMCU.
Positive (+) pin of Buzzer is connected to D2 pin of NodeMCU.
GND (-) pin of Buzzer is connected to GND pin of NodeMCU.

watch the video for how to setup the blynk app it will show you step by step

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Code for this project

//for more project visit:www.blackkeyhole.com

#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>

#include <BlynkSimpleEsp8266.h>

// You should get Auth Token in the Blynk App.
char auth[] = "";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "";//your wifi name
char pass[] = "";//your wifi password

int buzzer = D2;
int smokeA0 = A0;

// Your threshold value. You might need to change it.
int sensorThres = 300;//you can change the value as your wish

void setup() {
 Serial.begin(115200);
 delay(10);
 Blynk.begin(auth, ssid, pass);
 pinMode(buzzer, OUTPUT);
 pinMode(smokeA0, INPUT);
 
}

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

 Serial.print("Pin A0: ");
 Serial.println(analogSensor);
 // Checks if it has reached the threshold value
 if (analogSensor > sensorThres)
 {
   tone(buzzer, 1000, 200);
   Blynk.notify("Alert: Fire in the House");  
 }
 else
 {
   noTone(buzzer);
 }
 delay(100);
 Blynk.run();
}