#include <LiquidCrystal_I2C.h>
#include <Wire.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
int pre_data = "";


void setup() {
  // put your setup code here, to run once:
  lcd.init();
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int data = analogRead(A0);

  //設定第1行顯示:
  lcd.setCursor(0, 0);
  lcd.print("A0 = ");  //顯示文字
  lcd.print(pre_data);  //顯示文字

  //設定第2行顯示:
  lcd.setCursor(0, 1);
  lcd.print("A0 = ");  //顯示文字
  lcd.print(data);  //顯示文字

  //Print同步顯示:
  Serial.print("A0 = ");
  Serial.println(data);

  pre_data = data;
  delay(150);
}