#include  <Wire.h>
#include  <LiquidCrystal_I2C.h>
#include <DFRobot_DHT11.h>
#include <MQ2.h>
DFRobot_DHT11 DHT;
LiquidCrystal_I2C lcd(0x27, 20,4);  // I2C adress
#define DHT11_PIN 3

const int IRPin=2;
const int ledPin = 16;
const int ledPinG = 10;
const int ledPinB = 12;
const int BuzPin = 1;
const int pin = 5;
int sensorValue = 0;
int prestate = 0;
int count=0;
int stat=0;
float lpg, co, smoke;
MQ2 mq2(pin);


void setup() 
{
  Serial.begin(115200);
  pinMode(IRPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(ledPinG, OUTPUT);
  pinMode(ledPinB, OUTPUT);
  pinMode(BuzPin, OUTPUT);
  
  mq2.begin();
  lcd.begin();
  lcd.backlight();
  delay(250);
  lcd.noBacklight();
  delay(250);
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Fablab Kamakura");
  delay(1000);
  lcd.setCursor(0,1);
  lcd.print("Setyawan UGM");
  delay(2000);
  lcd.clear();
 // digitalWrite(BuzPin, HIGH);
}

void loop() 
{
  DHT.read(DHT11_PIN);


  Serial.print("temperature:");
  Serial.print(DHT.temperature);
//  Serial.print(char(176));
  Serial.println("\u00b0 C");
  Serial.print("humidity :");
  Serial.print(DHT.humidity);
  Serial.println("%");
  lcd.setCursor(0,0);
  lcd.print("T:");
  lcd.setCursor(2,0);
  lcd.print(DHT.temperature);
  lcd.setCursor(5,0);
  lcd.print("H:");
  lcd.setCursor(7,0);
  lcd.print(DHT.humidity); 
  
  float* values= mq2.read(true);
  lpg = mq2.readLPG();
  lcd.setCursor(10,0);
  lcd.print("LPG:");
  lcd.setCursor(14,0);
  lcd.print(lpg);
         lcd.setCursor(4,3);
        lcd.print("READY TO USE");  

    sensorValue = digitalRead(IRPin);  
    if(sensorValue==0){
          lcd.clear(); 
      if (count==stat){
             count++;
      }
       digitalWrite(ledPin, HIGH);
       digitalWrite(ledPinG, HIGH);
       digitalWrite(ledPinB, LOW);
       lcd.setCursor(0,2);
       lcd.print("IN USE");
       Serial.print("Status :");
       Serial.println("Full");
       Serial.println();
       prestate = 1;

    }
    else 
    {
       digitalWrite(ledPin, LOW);
       digitalWrite(ledPinB, LOW);
       digitalWrite(ledPinG, LOW);
       lcd.setCursor(0,2);
       lcd.print("EMPTY ");
       Serial.print("Status :");
       Serial.println("Empty");
       Serial.println();
       stat = count;
       if (prestate == 1||lpg>2){
        for (int i=1; i<=10; i++) {
        digitalWrite(BuzPin, HIGH);
        digitalWrite(ledPinB, HIGH);
        delay(500);  
        digitalWrite(BuzPin, LOW);
        digitalWrite(ledPinB, LOW);
        delay(700);
        lcd.setCursor(2,3);
        lcd.print("CHANGE THE LITTER");
        
        }
        lcd.clear();
       }
       prestate = 0;
       
} 
 lcd.setCursor(12,2);
 lcd.print("Count");
 lcd.setCursor(18,2);
 lcd.print(count);

}