Controlling MP3 player with serial commands

Hello!

I an trying to send serial commands to a MP3 player using the Tx and Rx pins.

http://avrcard.com/products/mp3orator.htm

I have been able to get data from the player and display it in the Serial monitor, if I trigger the player by physical connetions.

But I can't send it commands. According to the documentation I should send "PF: 10000" to play the file "10000.mp3". It should then send a resonse back "PLAYING 10000.mp3".

But I think i am getting confusion when trying to read and write serial data at the same time.

So how can i send a command and wait for a resonse, and write it to the serial monitor only? I think waht happens now is, that when I try to write to the serial monitor, I also write to the MP3 player.

So how can i: 1. send a serial command to the mp3 player 2. get a response back and 3. write that to the serial monitor?

my code so far:

char incomingByte;  // for incoming serial data


void setup() {
  

  Serial.begin(9600);


}




void loop() {

  // Send play command to MP3 via Tx
 Serial.write("PF:10000");


    //READ REPSONSE FROM  MP3 player
      // send data only when you receive data:
    while (Serial.available() > 0) {
              
        // read the incoming byte:
        incomingByte = Serial.read();
                
        // say what you got:
        //Serial.print("I received: ");
        Serial.print(incomingByte);

    }


//WAit 5 sec, and play again

delay(5000);
}

Hm. OK, but if I disconnect the USB, disable code that write to the monitor and use external power; should it then automatically connect to the MP3 player? Will the onboard Tx and Rx LEDs blink when communicating with the player?

And I just need to find a different way to indicate that I got a response?

I am using the arduino Uno. Smb version. The one with the tiny chip and not the big chip.

Thanks for your help! :-)

Ok I got the New Software Library working. :slight_smile:

But i often get garbage in the messages, and I think that mess up the reliability.
But generally I can read the incomming messages from the player inbetween the garbage.

It was more stable in the standard Tx an Rx pins.

How can “filter out” the garbage?

My Code

#include <NewSoftSerial.h>

#define rxPin 2
#define txPin 3


char incomingByte;	// for incoming serial data
boolean isPlaying = false;
NewSoftSerial mySerial(rxPin, txPin);


void setup()  {
  // define pin modes for tx, rx, led pins:
  pinMode(rxPin, INPUT);
  pinMode(txPin, OUTPUT);

 Serial.begin(9600);
 mySerial.begin(9600);

 pinMode(8, INPUT);

}




void loop() {


    if ((digitalRead(8) == HIGH) && (isPlaying==false)) {
        playAudio();
    }
    
    if ((digitalRead(8) == HIGH) && (isPlaying==true)) {
      fadeOut();
    }

   //READ RESPONSE FROM  MP3 player
    // send data only when you receive data:
  while (mySerial.available() > 0) {

	// read the incoming byte:
	incomingByte = mySerial.read();
                
	// say what you got:
       
	Serial.print(incomingByte);

	}


}

void playAudio() {
mySerial.flush();
 mySerial.println("PF 10007");
 
 isPlaying = true;
 delay(500);
}
 
void fadeOut() {
  //Fade out
   mySerial.flush();
   mySerial.println("FO");
 
   delay(1000);
   // Stop file
   mySerial.flush();
   mySerial.println("SP");
   
  isPlaying = false;
}

My Garbage

F`ÿnÿ
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½µµ?¹?5)Rþ ÿ
Q%=9é?¢½ÁÁ??5)
¢?õÊJ*r?½??¥±?5)Rþ@ÿ`ÿ00)ÿPLAY: 10007.MP3

ý¨H(jUÔÊJ?¢½ÁÁ??5)
¢?õÊJ*r?½??¥±?5)Rþÿ`ÿ`ÿ7
PLAY: 10007.MP3

SP

ACTION: Stopped
ACTION: End of file

@ÿ`ÿ007ÿPLAY: 10007.MP3

SP

ACTION: Stopped
ACTION: End of file

ACTION: End of file

Thanks