#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup() 
{
  Serial.begin(9600);
  pinMode(A0, INPUT);
  analogReference(EXTERNAL);
  // Init
  lcd.init();
  lcd.backlight();
  // Print something
  lcd.setCursor(3, 0);
  lcd.print("Hello, world!");
  lcd.setCursor(2, 1);
  lcd.print("Wokwi Online IoT");
  lcd.setCursor(5, 2);
  lcd.print("Simulator");
  lcd.setCursor(7, 3);
  lcd.print("Enjoy!");
  delay(500);
  lcd.clear();
}


void loop() 
{
    uint16_t adc = analogRead(A0);
    lcd.setCursor(1, 0);
    lcd.print("adc = ");
    lcd.setCursor(7, 0);
    lcd.print(adc);
    delay(300);
    lcd.setCursor(7, 0);
    lcd.print("      ");
    // delay(900);
}