MP3 Player dengan DF Player dan NodeMCU ESP 8266

//based on http://arduiner.blogspot.co.id/2016/06/nodemcu-esp8266-dfplayer-mp3-music-from.html
#include 
#include 
#define PIN_BUSY 14
SoftwareSerial mp3Serial(5, 4); // RX, TX
void setup () {
  pinMode(PIN_BUSY, INPUT);
  Serial.begin (115200);
  Serial.println("Setting up software serial");
  mp3Serial.begin (9600);
  Serial.println("Setting up mp3 player");
  mp3_set_serial (mp3Serial);  
  // Delay is required before accessing player. From my experience it's ~1 sec
  delay(1000); 
  mp3_set_volume (30);
}
void loop () {
  if(analogRead(0) <100){
  Serial.println("Stop");
  mp3_stop ();
  Serial.print("Busy: ");
  Serial.println(digitalRead(PIN_BUSY));
  delay(500);
  Serial.println("play next");
  mp3_next ();
  Serial.print("Busy: ");
  Serial.println(digitalRead(PIN_BUSY));
  delay (12000);
  }
}