Arduino

/**

* NOTES: multiple files works on the component that has MP3-TF-16P V3.0 printed on it,

*        but DFPlayer Mini only plays a single file...

* To use the DF Mini with a Circuit Playground, we

* cannot use SoftwareSerial library. Instead, we use

* the built-in TX and RX pins that support TTL serial.

* To hook this up, view the left set (hold the module so that the

* label letters are facing correctly) of pins as numbered

* 0 to 7, with 7 closest to where the MicroSD is inserted.

* - pin 0 to 3.3V

* - pin 1 to TX

* - pin 2 to RX

* - pin 3 to nothing

* - pin 4 to nothing

* - pin 5 to red of audio cable

* - pin 6 to to GND

* - pin 7 to black of audio cable

**/

#include <Adafruit_CircuitPlayground.h>

#include "DFRobotDFPlayerMini.h"

// Must connect to dedicated TX and RX (labeled on board)

#define softwareSerial Serial1

// Create the Player object

DFRobotDFPlayerMini player;

bool connected;

int value;

int mp3Num = 1;

int NUM_MP3S = 3; // however many mp3s you have

void setup() {

 CircuitPlayground.begin();

 // Init USB serial port for debugging

 Serial.begin(9600);

 // Init serial port for DFPlayer Mini

 softwareSerial.begin(9600);

 Serial.println( "hello!" );

 connectPlayer();

 if ( connected )

 {

   // Play the first MP3 file on the SD card

   player.play(1);

   delay(3000);

   player.play(2);

   delay(3000);

   Serial.println("Finished playing");

 }

}

void connectPlayer() {

 // Start communication with DFPlayer Mini

 if (player.begin(softwareSerial)) {

   Serial.println("OK");

   connected = true;

   // Set volume to maximum (0 to 30).

   player.volume(20);

 } else {

   Serial.println("Connecting to DFPlayer Mini failed!");

   connected = false;

 }

}

void loop() {

  value = CircuitPlayground.lightSensor();

  Serial.print("Light Sensor: ");

 Serial.println(value);

 if ( value < 5 )

 {

   if ( !connected )

     connectPlayer();

   CircuitPlayground.setPixelColor(0,   0, 255, 255);

   player.play(mp3Num);

   mp3Num = mp3Num % NUM_MP3S + 1; // go to the next mp3; start numbering at 1

   delay( 3000 ); // delay to cover length of sound

   CircuitPlayground.setPixelColor(0,   0,   0,   0);

 }

 delay(1000);

}