查看“Microduino-LM4863”的源代码

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[[file:Microduino-LM4863-rect1.jpg|400px|thumb|right|Microduino-LM4863]]
Microduino-LM4863 is a D-Class Amplifier Module. Widely used in music embedded system.

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==Feature==
*2.54 Connector with good compatibility;
*Suppress power noise, gain stability;
*Small, cheap, stackable, opened platform
*Open source hardware circuit design, compatible with the Arduino IDE development environment for programming; 
*Define unified interface Microduino specification and contain rich peripheral modules. Set up the quick connection with other Microduino modules and sensors easily and flexibly;
*2.54 pitch row female connector for easy integration into breadboard.


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==Specifications==
*Provide 2.2W output for 4Ω load;
*Operating Voltage：2.0-5.5V；
*Externally controlled, low-power shutdown mode, typical shutdown current of 0.7uA.

[[File:LM4863-Pinout-2.jpg|800px|thumb|center|Microduino-LM4863-Pinout]]
[[File:LM4863-Pinout-1.jpg|800px|thumb|center|Microduino-LM4863-Pinout]]

==Document==
Eagle PCB '''[[File:Microduino-LM4863.zip]]'''

===Main Component===
*Amplifier chip：LM4863  '''[[File:LM4863.pdf]]'''

==Development==
*Make sure the 5V power supply current can reach 500ma, not recommended use FT232R debugging directly, becasue FT232R's output current is small.

===Arduino library and supported package===
*【SimpleSDAudio library'''[[http://www.hackerspace-ffm.de/wiki/index.php?title=SimpleSDAudio download ]''' 】
*【SimpleSDAudio updated library '''[[File:Lib SimpleSDAudio.zip]]''' 】


===How to use the library===
*Original library SD module CS pin is D4, need change to D7;
*Original library can not directly support Microduino Core +, we have modified this library to solve this problem;

*Recommend 2GB or less (including 2GB) FAT format TF card.


===Externally controlled low-power shutdown===
*In many applications, the shutdown port's level conversion is finished by the controller, but it can also be used to implement by a one-way blade switch;
**Connect a pull-up resistor on the third pin of Second row pin female which near the D13 pin, then disconnect switch, this pin will be pulled low, so the Amplifier begin to work;
**Turn on the switch，pull-up resistor will pull up the voltage, then LM4863 stop work.

==Application==

===Program Download===
*Audio file conversion tool：'''[[File:Tools_lm4863.zip]]'''

===The Audio experiment using Core and SD===
*Prepared Hardware：Microduino FT232R、Microduino Core、Microduino SD、Microduino LM4863；
*Prepared Software：Arduino IDE（1.0 release upper）、Microduino provides test program（Arduino part）、SimpleSDAudio library、Audio file creation tools；
*将下载好的库文件夹放入Arduino IDE安装文件夹内的libraries中；
*将examples文件夹的EXAMPLE.AFM复制到存储卡内
*启动Arduino IED，打开BareMinimum示例程序，板卡选择Microduino Core (Atmega328P@16M,5V)，直接下载即可；
*就可以听到声音了！
**如果要播放自己的音频，需要把“EXAMPLE.AFM”改成生成的音频文件名即可；

===音频文件制作过程===
*把任意音频文件转换成.wav格式，这里用到格式工厂；
*生成音频文件：
**我们需要用到一款基于SoX的工具，然后根据你的Microduino的工作频率选择合适的转换程序；
**解压工具，进入“Arduino with 16 MHz”文件夹，把音频文件放入到该文件夹中，并拖动到“FullRate@16MHz_Stereo.bat”（16M全速立体声）批处理上；
**即可转换程序，会弹出一对话框，出现“请按任意键继续...”；
**结束后你会发现新建了一个文件夹，转换好的文件就在里面。


==Pictures==
:[[file:Microduino-LM4863-t.jpg|thumb|600px|center|Microduino LM4863 Front]]
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:[[file:Microduino-LM4863-b.jpg|thumb|600px|center|Microduino LM4863 Back]]
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