#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
int rozsah;

bool test1 = true;
bool test2 = true;

void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(115200);
  pinMode(2,INPUT_PULLUP);
  pinMode(0,INPUT_PULLUP);
  pinMode(25, INPUT);
}

void loop() {
  if(digitalRead(2) == LOW && test1 == true){
    rozsah++;
    Serial.println(rozsah);
    test1 = false;

  }
  else if(digitalRead(2) == HIGH && test1 == false)
  {
    test1 = true;
  }
  if(digitalRead(0) == LOW && test2 == true && rozsah > 1){
    rozsah--;
    Serial.println(rozsah);
    test2 = false;

  }
  else if(digitalRead(0) == HIGH && test2 == false)
  {
    test2 = true;
  }

  lcd.setCursor(0,1);
  lcd.print("0 - ");
  lcd.setCursor(4,1);
  lcd.print(rozsah);
  lcd.print(" ");

  lcd.setCursor(0,0);
  int a = analogRead(25);
  a = map(a,0,4095,0,rozsah);
  lcd.println(a);
}