#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
byte slide=36;  //滑動可變電阻
byte led=18;    //LED

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.clear();
  lcd.backlight(); 
}
void loop() {
  lcd.print("AnalogRead_slide");
  int val = analogRead(slide);
  byte byteValue=map(val,0,4095,0,255);
   
  Serial.print(val);Serial.print("===>");  
  Serial.println(byteValue);  //顯示序列視窗
  analogWrite(led,byteValue); //LED調光，0~255   
  //dacWrite(DAC1,byteValue);
  lcd.setCursor(2,1);
  lcd.print(val);lcd.print("==>");
  //轉換後的值  
  lcd.setCursor(10,1);
  lcd.print(byteValue);
  delay(1000);
  lcd.clear(); 
}