#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16,2);

int num;
int first, first1 = HIGH;
int numPosun = 5;

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();

  pinMode(33, INPUT_PULLUP);
  pinMode(25, INPUT_PULLUP);
}

void loop() {
  int poten = analogRead(13);
  int state = digitalRead(25);
  int state1 = digitalRead(33);
  lcd.setCursor(0,1);
  lcd.print("0 - ");

  if(first == HIGH && state == LOW){
    num = num - numPosun;
    if(num < 0)
      num = 0;

    lcd.setCursor(4, 1);
    lcd.print("       ");
    lcd.setCursor(4, 1);
    lcd.print(num);
  }
   if(first1 == HIGH && state1 == LOW){
    num = num + numPosun;
    lcd.setCursor(4, 1);
    lcd.print("       ");
    lcd.setCursor(4, 1);
    lcd.print(num);
  }

 
  int potecMap = map(poten, 0,4096, 0,num);
  lcd.setCursor(0,0);
  lcd.print(potecMap);
  lcd.print("   ");
  
  first = state;
  first1 = state1;
}