user14572: I have a basic mp3 trigger with arduino uno setup:
Trigger - https://www.sparkfun.com/products/11029
Arduino Uno code:
#include <MP3Trigger.h>

//  Script Function:  RobertSonics mp3trigger (v2) paired with an Arduino UNO
//  
//  Jumper Connections:   UNO  ------  mp3trigger (v2)
//             (UNO RX)     0  ------  TX
//             (UNO TX)     1  ------  RX
//             (Ground)   GND  ------  GND
//           (+5 volts)    5v  ------  USBVCC

#include <SoftwareSerial.h>
void setup(){
    Serial.begin(38400);    // Standard for mp3trigger  
    Serial.print("t");
    Serial.write(1);
    delay(50000);    
}


void loop()
{

}

I can't get it to play any tracks. The response in the Serial monitor just says tt

user10394: So, from the beginning:

Have you got data on you SD card and is it is FT16 or FAT32 format?
Is the MP3 status light giving any indication of life?
Does the MP3 card detect when you start it up without the SD card in (One long flash).
Do you have a data file named "001SomethingOrOther.MP3"?
Have you tried the command "v" 0x00?
Have you tried the commands "S0" and "S1"?
Have you looked at the sample data on http://robertsonics.com/mp3-trigger-support/?

Hope that helps, an please post your finding, because mine arrives next week :)

14572: <p>I have a basic mp3 trigger with arduino uno setup:</p>

<p>Trigger - <a href="https://www.sparkfun.com/products/11029" rel="nofollow">https://www.sparkfun.com/products/11029</a></p>

<p>Arduino Uno code:</p>

<pre><code>#include &lt;MP3Trigger.h&gt;

//  Script Function:  RobertSonics mp3trigger (v2) paired with an Arduino UNO
//  
//  Jumper Connections:   UNO  ------  mp3trigger (v2)
//             (UNO RX)     0  ------  TX
//             (UNO TX)     1  ------  RX
//             (Ground)   GND  ------  GND
//           (+5 volts)    5v  ------  USBVCC

#include &lt;SoftwareSerial.h&gt;
void setup(){
    Serial.begin(38400);    // Standard for mp3trigger  
    Serial.print("t");
    Serial.write(1);
    delay(50000);    
}


void loop()
{

}
</code></pre>

<p>I can't get it to play any tracks. The response in the Serial monitor just says tt</p>
 10394: <p>So, from the beginning:</p>

<ol>
<li>Have you got data on you SD card and is it is FT16 or FAT32 format?</li>
<li>Is the MP3 status light giving any indication of life?</li>
<li>Does the MP3 card detect when you start it up without the SD card in (One long flash).</li>
<li>Do you have a data file named "001SomethingOrOther.MP3"?</li>
<li>Have you tried the command "v" 0x00?</li>
<li>Have you tried the commands "S0" and "S1"?</li>
<li>Have you looked at the sample data on <a href="http://robertsonics.com/mp3-trigger-support/" rel="nofollow">http://robertsonics.com/mp3-trigger-support/</a>?</li>
</ol>

<p>Hope that helps, an please post your finding, because mine arrives next week :)</p>
