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LPG Sensor Using Arduino Uno

Introduction

 
In this article, I'll show you 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
  1. #include < LiquidCrystal.h >    
  2. int mq = A0;    
  3. int led = 12;    
  4. int buz = 10;    
  5. int m;    
  6. float p;    
  7.     
  8. LiquidCrystal lcd(2, 3, 4, 5, 6, 7);    
  9.     
  10. void setup()    
  11. {    
  12.     pinMode(led, OUTPUT);    
  13.     pinMode(buz, OUTPUT);    
  14.     digitalWrite(led, LOW);    
  15.     digitalWrite(buz, LOW);    
  16.     lcd.begin(16, 2);    
  17. }    
  18. void loop()     
  19. {    
  20.     d = analogRead(mq);    
  21.     lcd.setCursor(0, 0);    
  22.     lcd.print("LPG GAS SENSOR");    
  23.     
  24.     if (m > 60)     
  25.     {    
  26.         p = 0;    
  27.     } else     
  28.     {    
  29.         p = (m - 60) / 9.64;    
  30.     }    
  31.     lcd.setCursor(0, 1);    
  32.     lcd.print(p);    
  33.     lcd.setCursor(5, 1);    
  34.     lcd.print("%");    
  35.     if (p >= 30)     
  36.     {    
  37.         digitalWrite(led, LOW);    
  38.         digitalWrite(buz, HIGH);    
  39.         lcd.setCursor(9, 1);    
  40.         lcd.print("Little Leakage");    
  41.     } else     
  42.     {    
  43.         digitalWrite(led, HIGH);    
  44.         digitalWrite(buz, LOW);    
  45.     }    
  46.     delay(500);    
  47.     lcd.clear();    
  48. }   
    Explanation:
    • The Gas Sensor is connected to the analog input pin A0.
    • Digital pin 10 is used to control the buzzer.
    • 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:
     
     
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