#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include "DHT.h"
#define ONE_WIRE_BUS 4
#define DHTPIN 36
#define DHTTYPE DHT22

OneWire oneWire(ONE_WIRE_BUS);
 DallasTemperature sensors(&oneWire);
LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display
DHT dht(DHTPIN, DHTTYPE);

float humi,tempC ,temp;

//Variables for auto scroll
unsigned long previousMillis = 0;
unsigned long interval = 5000; //Desired wait time 10 s 
int page_counter=1 ;
int up = 34;               //Up button
int down = 33; 



boolean current_up = LOW;          
boolean last_up=LOW;            
boolean last_down = LOW;
boolean current_down = LOW;

boolean debounce(boolean last, int pin)
{
boolean current = digitalRead(pin);
if (last != current)
{
delay(5);
current = digitalRead(pin);
}
return current;
} 

void setup()
{




     Serial.begin(115200);
    dht.begin();     // initialize the sensor


  lcd.init();
  lcd.backlight(); //Turns backlight on
  sensors.begin();
}

void loop(){
 unsigned long currentMillis = millis();       
sensors.requestTemperatures();
   temp = sensors.getTempCByIndex(0);

  current_up = debounce(last_up, up);         //Debounce for Up button
current_down = debounce(last_down, down);



if (last_up== LOW && current_up == HIGH){  //When up button is pressed
      lcd.clear();                     //When page is changed, lcd clear to print new page  
      if(page_counter <2){              //Page counter never higher than 3(total of pages)
      page_counter= page_counter +1;   //Page up
      
      }
      else{
      page_counter= 2;  
      }
  }
  
    last_up = current_up;

//Page Down
    if (last_down== LOW && current_down == HIGH){ //When down button is pressed
      lcd.clear();                     //When page is changed, lcd clear to print new page    
      if(page_counter >1){              //Page counter never lower than 1 (total of pages)
      page_counter= page_counter -1;   //Page down
      
      }
      else{
      page_counter= 1;  
      }
  }
    
    last_down = current_down;



switch (page_counter) {
   
    case 1:{     //Design of home page 1
     lcd.setCursor (0, 0 );
    lcd.print("Victor: ");
   lcd.print(temp,1);
   lcd.print((char)223); // print ° character
    lcd.print("C");
    }
    break;

    case 2: { //Design of page 2 
      lcd.setCursor(0, 0);  // start to print at the first row
    lcd.print("Liv.room: ");
    lcd.print(tempC,1);     // print the temperature
    lcd.print((char)223); // print ° character
    lcd.print("C");
     lcd.setCursor(0, 1);  // start to print at the second row
    lcd.print("Humidity: ");
    lcd.print(humi,1);      // print the humidity
    lcd.print("%");

    }
    break;

    
  }//switch end
  





    //unsigned long currentTime = millis();

    humi  = dht.readHumidity();    // read humidity
    tempC = dht.readTemperature(); // read temperature

 
  


 if (currentMillis - previousMillis > interval) {  //If interval is reached, scroll page
      previousMillis = currentMillis;                   //replace previous millis with current millis as new start point
           lcd.clear();                                      //lcd clear if page is changed.
                if (page_counter <2){                             //Page counter never higher than 3 (total of pages)
                     page_counter = page_counter +1;                   //Go to next page
                          }
                               else{
                                     page_counter=1;                                  //if counter higher than 3 (last page) return to page 1
                                          }
                                              }
                                               delay(400);

}