查看“Microduino-Audio”的源代码

{{Language|Microduino-Audio}}
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[[File: Microduino-Audio-rect.jpg|400px|thumb|right|Microduino-Audio]]
Microduino-Audio is the audio play module based on JQ6500 serial port MP3 chip, which together with Audio-KEY-SD can play flash music by thumbwheel switch control and with Microduino core module can send serial port commands to control the system.  









==Features==
*Multiple control modes, serial port mode and thumbwheel switch control mode. 
*Allow external memory card connection and play as well as disk display while connecting with a computer and content update. 
*Sleep mode serial port setting and low power consumption. 
==Specification==
* MP3 format:  
**Support all bit rate 11172-3 and ISO13813-3 layer3 audio decoding.  
**Support sampling rate (KHZ):8/11.025/12/16/22.05/24/32/44.1/48 
**Normal, Jazz, Classic, Pop and Rock supportable   
*Support asynchronous serial communication mode and receive commands sent from the upper computer by serial port:    
**Communication standard: 9600 bps  、
**Data bit:1 
**Check bit:none 
**Flow control:none
*24-bit DAC output, 90dB dynamic range and 85dB signal noise ratio supportable. 
*Support FAT16 and FAT32 system as well as 32G memory card to the maximum
*With broadcast language insertion function, you can pause the playing background music.   
*Audio data is sorted by folders with 100 folders at the most supportable. Each folder can be sorted with 1000 pieces of music. 
*30-level volume adjustable (0x00-0x1E)   


==Document==
JQ6500 sound chip description:  [[File:JQ6500.pdf]]

==Development==
*Thumbwheel switch control  
**Hardware needed：Microduino-Audio, Audio-KEY-SD, [[Microduino-Amplifier]], two loudspeaker and a USB cable, power (1A or higher) or Microduino extension module. 
**Connect Microduino-Audio to your computer with a USB cable and then write the audio file into flash by checking the reference document.  
**Stack Audio-KEY-SD and meantime, the microUSB interface of Microduino-Audio doesn’t connect with the computer directly but switch to another power supply for fear of recognizing the driver. Besides, the electricity current should be more than 1A or the system may fail to play normally. 
**Pull the thumbwheel switch to the right, you can play the last song and to the left, the next song.  
*Serial commands control the songs inside the memory card.  
**Hardware needed: [[Microduino-Core]], [[Microduino-USBTTL]], [[Microduino-Amplifier]], Microduino-Audio, Audio-KEY-SD and two loudspeakers as well as power source (1A or higher) or Microduino extension module; 
**Connect Microduino-Audio and the computer with USB cable can you can find two disks—one is the flash of MP3 chip and the other is memory card. 
**Open the memory card and establish a folder whose format is named with 01 or 02 … … … … 99. Put all songs you want to play into the newly-created folder and just name the folder with 001 or 002 … … 999.
*Start Arduino IDE, copy the program into IDE and choose the right board Microduino Core (Atmega328P@16M, 5V) and then upload to the core board with Microduino-USBTTL after compiling. Please don’t stack Microduino-Audio module during the upload, or it may cause serial port conflict.   
<source lang="cpp">

byte key0[5] ={0x7E,0x03,0x09,0x01,0xEF};//device select "tf"   U/TF/AUX/SLEEP/FLASH      00-05
byte key1[5] ={0x7E,0x03,0x11,0x00,0xEF};//play mode     "all"  ALL FOL ONE RAM ONE_STOP  00-05
byte key2[4] ={0x7E,0x02,0x0d,0xEF};     //play 7E 02 0D EF
byte key3[5]={0x7E,0x03,0x06,0x18,0xEF};//vol 24 0-1E(0-30)-16,8,4,2,1

void setup()
{
  Serial.begin(9600); // 9600 bps
  delay(300);
  for(int a=0;a<5;a++)Serial.write(key11[a]);  //vol 18
  delay(300);
  for(int a=0;a<5;a++)Serial.write(key0[a]);  //tf card
  delay(300);
  for(int a=0;a<5;a++)Serial.write(key1[a]);  //play all
  delay(600);
   for(int a=0;a<4;a++)Serial.write(key3[a]);  //play
  delay(600);
}
void loop()
{

}
</source>
Program Description:  
*First define commands and then send the commands to Microduino-Audio through the serial port during initializing. More commands description, please check the reference document. 
*Stack Microduino-Audio, Audio-KEY-SD and [[Microduino-Amplifier]] together after the upload.  
==Application==
Microduino-Audio is widely used in various kinds of voice broadcast:  
*In-car navigation voice broadcast 
*Road transport inspection and toll station voice prompts;  
*Railway station and bus station security check voice prompts;
*Electric power, communication and financial hall voice prompts;  
*Vehicle in-and-out access verifying voice prompts;  
*Public security border control channel voice prompts;  
*Multi-channel voice alarm or equipment operation guide voice;  
*Electric tour car safe driving voice notices;  

==Purchase==

==History==

==Picture==

==Front==
[[file:Microduino-Audio-F.JPG|thumb|600px|center|Microduino-Audio Front]]
==Back==
[[file:Microduino-Audio-b.JPG|thumb|600px|center|Microduino-Audio Back]]
==Video==
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