查看“Music Player”的源代码

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==Objective==

The course will show you how to control Microduino modules to achieve a music player by using Processing. 

==Equipment==
*'''[[Microduino-Core]]'''
*'''[[Microduino-FT232R]]'''
*'''[[Microduino-SD]]'''
*'''[[Microduino-LM4863]]'''


*Other Hardware Equipment 
**A USB cable   
**A loudspeaker 
**A storage card 

==Schematic==

Just stack the four Microduino modules mentioned above and connect the two wires of the loudspeaker to Microduino-LM4863   

==Program==

https://github.com/Microduino/Microduino_Tutorials/tree/master/Microduino_Processing/MicroduinoMusicplayer

https://github.com/Microduino/Microduino_Tutorials/tree/master/Microduino_Processing/ProcessingMusicplayer

==Debugging==

Step 1：The hardware building of the circuit can refer to:
http://www.microduino.cc/wiki/index.php?title=Microduino_LM4863%E9%9F%B3%E4%B9%90%E6%92%AD%E6%94%BE%E5%99%A8-301KIT/zh


*Insert the storage card into the slot of Microduino SD  
[[File:301KIT-SD.jpg|600px|center|thumb|301KIT-SD]]
*Connect the loudspeaker 
[[File:301KIT-speaker.jpg|600px|center|thumb|301KIT-Speak]]


Build the hardware environment according to the schematic, just like this: 
[[File:processingMusicplayerConnectionDiagram.jpg|600px|center|thumb]]


Step 2：Audio Production  
*A SoX-based tool will be needed. And you can choose a proper conversion program according to the operational frequency of you Microduino modules.  
*Extract the file to “Microduino with 16 MHz” folder and put the audio file into the folder, then select “FullRate@16MHz_Mono.bat” 
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[[File:audio-1.jpg|600px|center|thumb|Audio]]
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*A dialog box will pop up, showing “Press any key to continue...”
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[[File:audio-2.jpg|600px|center|thumb|Audio]]
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*After that, there appears a newly created folder and you will find the converted file inside. If failed, you can convert the audio file to “wav” format and have another try. 
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[[File:audio-3.jpg|600px|center|thumb|Audio]]
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*Copy the converted audio file to the storage card and insert the card into Microduino SD card slot. 
*Use IED to open the test program offered by Microduino and choose Microduino Core (Atmega328P@16M,5V). Here the things should be noticed before program download: 
**Since some libraries may have different pin definition, please download the changed libraries and replace the former ones; 
**The name of the audio file should also be changed to that of the generated audio file. 

Step 3：Here the code needed：

The code of two ends (Processing and Microduino)   

Microduino:

//The code keeps consistent with that of the 301kit of Microduino-LM4863 music player. The difference is the added function of receiving serial data   
    if(Serial.available())
    {
      command=Serial.read();
      Serial.println(command);
      SdPlay.worker();
      if(num_two!=num_one)
      {
        num_two=num_one ;
        if(command=='p') {//’p’ means play
          SdPlay.play();
          Serial.println(F("Play."));
        }
        else if(command=='t') {//’t’ means stop
          SdPlay.pause();
          Serial.println(F("Pause."));
        }
        Serial.println(ok);
        Serial.print(num_one);
        Serial.println(num_two);
      }
    }

Processing:

//Get the data of the first serial port. 
  println(Serial.list());
  // is always my Arduino, so I open Serial.list()[0].
  // Open whatever port is the one you're using.
  port = new Serial(this, Serial.list()[0], 9600);

//Add background-image, judge the mouse click, send play or pause instructions to Microduino to control the music player 
  void draw() {
    image(bg, 0, 0);
    if (button) {
      image(play, x, y);
      port.write("p");
    } 
    else {
      image(pause, x, y);
      port.write("t");
    }
  }


Step 4：Download the code and get it compiled successfully. 

Step 5：After the system goes well, a disk music player will appear on the screen. Click the button in the middle to see what happens. 

==Result==

The music player starts or pauses along with the click of the button, just like this:.
[[File:processingMusicplayerResult.jpg|600px|center|thumb]]


==Video==


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