Gas Detector Using MQ2 on ESP32 and Blynk App

Make your own gas leak detector today!

INTRODUCTION

The MQ-2 Gas sensor can detect or measure gasses like LPG, Alcohol, Propane, Hydrogen, CO, and even methane. With this sensor, we can build a gas leak detector to check if there is a gas leak and send a notification to our mobile phone. Watch this video to know how to make a gas detector using ESP32 and Blynk App.

HARDWARE PREPARATION

This tutorial use :

Software Preparation.

  1. Open the Arduino IDE. Please make sure that your Arduino IDE is version 1.6.9 and above.
  2. Then, click at the on Sketch – Include Library – Manage Libraries… Search for “blynk” and install the latest version of Blynk.
  3. Next, we need to install ESP32 development board.
  4. Insert this link into the Arduino preference “https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json”.
  5. Go to Tools>Boards>Board Manager and install the ESP32 board.

Sample Code

This is the sample code used for this tutorial. Try it!

#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
BlynkTimer timer;
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "YourAuthToken";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "YourNetworkName";
char pass[] = "YourPassword";
#define MQ2 34
#define GREEN 16
#define RED 17
int sensorValue = 0;
boolean state = false;
void setup()
{
// Debug console
Serial.begin(115200);
Blynk.begin(auth, ssid, pass);
pinMode(MQ2, INPUT);
pinMode(GREEN, OUTPUT);
pinMode(RED, OUTPUT);
timer.setInterval(1000L, sendUptime);
}
void sendUptime()
{
sensorValue = analogRead(MQ2);
Blynk.virtualWrite(V1, sensorValue);
Serial.println(sensorValue);
if (sensorValue > 600)
{
Blynk.notify("Gas Detected!");
digitalWrite(GREEN, LOW);
digitalWrite(RED, HIGH);
}
else
{
digitalWrite(GREEN, HIGH);
digitalWrite(RED, LOW);
}
}
void loop()
{
Blynk.run();
timer.run();
}
view raw mq2_ESP32.ino hosted with ❤ by GitHub

Thank you

Thank you for reading this tutorial and we hope it helps your project development. If you have any technical inquiries, please post at Cytron Technical Forum.

3 thoughts on “Gas Detector Using MQ2 on ESP32 and Blynk App”

  1. Is there any other way to power the node32 board? I want to install in my kitchen with a battery source. Please help

  2. Hello Admin,

    I have try this project and it very successfully function but the warning notification not display on my phone. Can help me?

    Thank you.

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