#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows


#define POTENTIOMETER_PIN A0

int liczba; 
bool clicked = false;


void setup()
{
  lcd.init(); // initialize the lcd
  lcd.backlight();

  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
}

void loop()
{
  lcd.clear();               
  lcd.setCursor(0, 0);       
  lcd.print("Liczba: ");
  lcd.print(liczba);         
  lcd.setCursor(0, 1);

  int data = analogRead(POTENTIOMETER_PIN);
  float percentage = map(data, 0, 1023, 0, 5000);


  lcd.print("Napicie: ");
  lcd.print(percentage/1000);
  lcd.print(" V");


  delay(50);

   if(liczba<40)
   {
   liczba=40;
   }

  
  if(digitalRead(2) == LOW && clicked == false ){
    clicked = true;
    liczba++;
    
    if(liczba>=80)
    {
    liczba=40;
    }
  }
  
 if(digitalRead(2) == HIGH)
 {
   clicked = false;
 }
 
 
if(digitalRead(3) == LOW)
{
 liczba=40;
}


delay(200);
}