#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const byte LCD_ADDRESS = 0x27;
const int LCD_COLUMNS = 20;
const int LCD_ROWS = 4;
const int POT_PIN = A1;

LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLUMNS, LCD_ROWS);

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.clear();

  lcd.setCursor(0, 0);
  lcd.print("POT TEST");
  lcd.setCursor(0, 1);
  lcd.print("Waiting 2 sec");

  delay(2000);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Reading A1");
  delay(1000);
}

void loop() {
  char dBuffer[20];
  char hBuffer[20];

  int value = analogRead(POT_PIN);

  snprintf(dBuffer, 20, "Value (dec): %4d", value);
  lcd.setCursor(0, 1);
  lcd.print(dBuffer);
  snprintf(hBuffer, 20, "Value (hex): %Xh  ", value);
  lcd.setCursor(0, 2);
  lcd.print(hBuffer);

  //lcd.setCursor(0, 1);
  //lcd.print("A1 value");

  //lcd.setCursor(0, 1);
  //lcd.print(value);
  //lcd.print("h");

  delay(1000);
}