LPG Sensor Using Arduino Uno

Introduction:

 

In this article I'll show you that how can we find out the LPG gas using the MQ2 Gas sensor and print the value in LCD (Liquid Crystal Display).

 

Requirements:

• Arduino Mega
• Bread Board
• MQ2 Gas Sensor
• LCD 16*2
• Led
• Buzzer 

Connection:

 

 

Led:

• Anode to Digital Pin 12
• Cathode to Gnd  

Buzzer:

• Anode pin to Digital Pin10
• Cathode pin to the gnd  

Programming: 

#include < LiquidCrystal.h >
    int mq = A0;
int led = 12;
int buz = 10;
int m;
float p;

LiquidCrystal lcd(2, 3, 4, 5, 6, 7);

void setup()
{
    pinMode(led, OUTPUT);
    pinMode(buz, OUTPUT);
    digitalWrite(led, LOW);
    digitalWrite(buz, LOW);
    lcd.begin(16, 2);
}
void loop()
{
    d = analogRead(mq);
    lcd.setCursor(0, 0);
    lcd.print("LPG GAS SENSOR");

    if (m > 60)
    {
        p = 0;
    } else
    {
        p = (m - 60) / 9.64;
    }
    lcd.setCursor(0, 1);
    lcd.print(p);
    lcd.setCursor(5, 1);
    lcd.print("%");
    if (p >= 30)
    {
        digitalWrite(led, LOW);
        digitalWrite(buz, HIGH);
        lcd.setCursor(9, 1);
        lcd.print("Little Leakage");
    } else
    {
        digitalWrite(led, HIGH);
        digitalWrite(buz, LOW);
    }
    delay(500);
    lcd.clear();
}

Explanation:

• The Gas Sensor is connected to the analog input pin A0.
• The Digital pin 10 is used to control the buzzer.
• The Digital Pin 12 is connected to the led.
• If the Gas sensor value is less than 60.
• The Buzzer and led is ON.
• Displays the result in liquid crystal display. 

Output:

 

 

Read more articles on Arduino:

• Police Strobe Light Using Arduino
• Read the Temperature With Arduino Uno