Description:

In this project we build an LPG Gas Leakage Detector using Arduino and MQ6 Gas sensor. Here, the MQ6 Gas sensor is used to LPG. Once the gas is detected, the LED lights up and buzzer makes sound. Also an alert message is displayed on the 16×2 LCD Display.

Circuit Diagram:

Components:

SR. NO.	COMPONENT	PINOUT DIAGRAM	BUY
1	Arduino UNO (Other Arduinos can be used too)	Arduino UNO Pinout Diagram⇗
2	Red LED
3	Buzzer
4	MQ6 Gas Sensor	MQ6 Gas Sensor Pinout Diagram⇗
5	330 Ohm Resistor
6	16×2 LCD Display

Steps and Info:

1. Get correct components as given. You can buy online or offline. I buy electronics components mostly from Amazon.

2. Start connecting the components. If you are new to connecting components in an electronic circuit, then use a Breadboard or you can straight up make connections using Jumper wires but it will create problem when there will be two or more connections needed at one pin (for example two or more different sensors 5V connection to Arduino’s 5V pin). But before soldering components on a PCB or printing a PCB for your circuit, better try using breadboard so that any errors and mistakes can be observed on breadboard and not after soldering. Or do connections in your way.

3. Now after building the circuit, download the Arduino IDE from https://www.arduino.cc/ website.

4. If you are new to Arduino IDE software, then watch this video we made specially for beginners about Arduino IDE.

5. If you know Arduino IDE then straight up copy the code we given and paste it into the Arduino IDE sketch.

6. Connect the Arduino to your Computer/device. Select a proper port, proper Arduino type and whatever other settings are. Here it is Arduino UNO. (If you don’t know what this all is then watch our video: ).

7. Compile the code and Upload it.

8. If any error occurs then try to troubleshoot it by finding/copy-pasting it into our Solve Errors page https://electronicsprojects.in/solve-errors/, or you can straight up paste the error on Internet and you know the rest. Also check if there are no spelling/syntax errors in the code. Compile the code again once to check if errors are fixed. I have given proper connections and code but still nothing is perfect.

9. Once code compiles and uploads smoothly, you can start testing the working of your circuit/project.

10. Now for this project, take your device to a place where there is an LPG Gas stove, try to pass very few amount of gas from the nozzle or the gas burner and check if the sensor detects the gas. If it detects then the LED will light up and buzzer will make sound. Also an alert message will be displayed on 16×2 LCD Display. If it doesn’t then find what’s wrong. Check connections, code and whatever it is. As LPG is hazardous, you can use a simple smoke from something as well to detect if the thing works or not.

11. NOTE: LPG gas is super hazardous! NEVER NEVER keep any fire/fire source near the LPG gas. If the gas comes in contact with fire, it ignites instantly or even blows up! Work safely and cautiously.

Program Code:

/* https://www.electronicsprojects.in LPG Gas Leakage Detector using Arduino, MQ6 Gas Sensor and 16x2 LCD Display */

#include <LiquidCrystal.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
int RedLED = 13;
int BUZZER = 11; 
int MQ6 = 0; 
int MQ6Sensor = 0; 
void setup() {
  lcd.begin(16,2);
  lcd.print("☢LPG DETECTOR☢");
  delay(1500);
  lcd.clear();
  pinMode(RedLED, OUTPUT); 
  pinMode(BUZZER, OUTPUT);
  pinMode(MQ6, INPUT);  
}
void loop() {
  MQ6Sensor = digitalRead(MQ6); 
  if (MQ6Sensor == HIGH) {  
   digitalWrite(RedLED, LOW); 
    lcd.print("❀SAFE❀");
    lcd.setCursor(0,1); 
    lcd.print("❀NO LPG LEAKAGE❀"); 
    noTone(BUZZER);
    delay(125);
    lcd.clear();
    
  } else { 
     digitalWrite(RedLED, HIGH);
    lcd.print("☢ALERT☢");
    lcd.setCursor(0,1);
    lcd.print("☢LPG IS LEAKED☢");
    tone(BUZZER, 1000, 200);
    delay(250);
    lcd.clear();
    delay(100);
  }
}

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