IOT BASED FIRE ALARRM SYSTEM

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  

Components Needed:

• 1x NodeMCU
• 1x MQ-2 Gas Sensor
• 1x Buzzer
• Jumper Wires
• Breadboard                                                                                                                                                          
  

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.

 

Setting Up the Blynk app:

 

   Click here for Download the app

  watch the video till the end.

 

Arduino Code:

   make sure that you have installed esp8266 library in your

Arduino library.

 

 

watch the video till the end.