dfplayer mini mp3

#include <SoftwareSerial.h>
#include <DFPlayer_Mini_Mp3.h>

SoftwareSerial mySerial(11, 10); // RX, TX

//
void setup () {
    Serial.begin (9600);
    mySerial.begin (9600);
    mp3_set_serial (mySerial);  //set softwareSerial for DFPlayer-mini mp3 module
    delay(1);  //wait 1ms for mp3 module to set volume
    mp3_set_volume (15);
}


//
void loop () {
    mp3_play (1);
    delay (6000);
    mp3_next ();
    delay (6000);
    mp3_prev ();
    delay (6000);
    mp3_play (4);
    delay (6000);
}