Example Code for Arduino-I2C Control

Hardware Preparation

• Arduino board
• DFR0112 Player
• IIC cables
• Micro SD card (1 GB, FAT formatted)

Software Preparation

• Arduino IDE (any version supporting the Wire library)
• Wire library (included in the Arduino IDE by default)

Wiring Diagram

Other Preparation Work

• The sd card must be formated at FAT format.
• YOU MUST Create a "sound" directory
• put mp3/wav/midi files under the SD card
• make sure the length of file name do not exceed 8 letters.
• Put jumper to IIC mode.
• Connect the player to Arduino board via IIC.
• Burn the sample code to the board.
• Open the serial monitor of Arduino and send commands:
  • p--pause
  • s--continue
  • n--next song
  • u--previous song
  • m--play song named"yes"
  • Note that no return except "OK" is returned under IIC mode.

Sample Code

#include <Wire.h>
#include <stdlib.h>

#define ArduinoPlayer_address 0x35  //ArduinoPlayer I2C address 0x35 (default)

void TwiSend(const char  *cmd)  //I2C Command
{
  char len = 0;
  len = strlen(cmd); //Calculate the length of the command
  Wire.beginTransmission(ArduinoPlayer_address); // ArduinoPlayer I2C address
  while(len--)
  {
    Wire.send(*(cmd  ));
  }
  Wire.endTransmission();    // stop transmitting
}
void setup()
{
  Wire.begin(); // join i2c bus (address optional for master)
  Serial.begin(9600);
  delay(2000);//Wait for 2 seconds
  Serial.println("Ready");
  TwiSend("\\:v 255\\r\\n");    // set the volume, from 0 (minimum)-255 (maximum)
}

//Receive control command from serial
void loop()
{
  int val;
  if(Serial.available() > 0)
  {
    val=Serial.read();
    switch(val)
    {
    case 'p':      // Pause
      TwiSend("\\:p\\r\\n");
      Serial.println("OK");
      break;
    case 's':     // Continoue to play
      TwiSend("\\:s\\r\\n");
      Serial.println("OK");
      break;
    case  'n':
      TwiSend("\\:n\\r\\n");  // Play next
      Serial.println("OK");
      break;
    case 'u':
      TwiSend("\\:u\\r\\n"); // Play previous
      Serial.println("OK");
      break;
    case  'm':      //Play
      //The volume must be set before playing the sound
      TwiSend("\\:v 250\\r\\n");    // set the volume, from 0 (minimum)-255 (maximum)
      TwiSend("\\yes\\r\\n");
      Serial.println("OK");
      break;
    default:
      break;
    }
  }
}

Result

Open the serial monitor of Arduino (baud rate 9600) and send commands. The serial monitor will return "OK" for each valid command. For example:

• Sending 'p' will pause the playback and return "OK".
• Sending 'n' will play the next song and return "OK".
• Sending 'm' will play the song named "yes" (if present in the "sound" directory) and return "OK".