林定祥 发表于 2013-6-23 09:44 
我想你已经试验过SD-MP3的播放程序，和人体感应模块的程序了吧，那应该对Arduino已经有所了解了。可以把两个 ...
谢谢你的回答，让我又多了一个新的思路，不过不精通语言是我的硬伤啊……
人体感应模块里感应到人的时候loop（）部分的语句是这样的
int in = digitalRead(ledpin);
Serial.println(in); //有人的时候输出高电平1 无人0
delay(2000);
所以我一开始的设想是让播放音乐的部分不停地循环播放，无人时，电平低所以不会有声音，出现人时电平高，开始发声，但是这样的想法的难点就在于怎样让它不停地发出指令p（默认SD卡中只有一个文件）
你给我的想法我觉得也非常好，比我的靠谱多了的样子，但这样对我来说难点就在怎样将人体感应到的反应，去替代通过串口发送的串口指令P
其实主要还是代码的问题啊……刚接触这个只懂一些基本的语句，真心改不起来……
以下是SD卡播放音乐的代码：
#include <SimpleSDAudio.h>
// Callback target, prints output to serial
void DirCallback(char *buf) {
Serial.println(buf);
}
char AudioFileName[16];
// Create static buffer
#define BIGBUFSIZE (2*512) // bigger than 2*512 is often only possible on Arduino megas!
uint8_t bigbuf[BIGBUFSIZE];
// helper function to determine free ram at runtime
int freeRam () {
extern int __heap_start, *__brkval;
int v;
return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
}
void setup()
{
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print(F("Free Ram: "));
Serial.println(freeRam());
// Setting the buffer manually for more flexibility
SdPlay.setWorkBuffer(bigbuf, BIGBUFSIZE);
Serial.print(F("\nInitializing SimpleSDAudio V" SSDA_VERSIONSTRING " ..."));
// If your SD card CS-Pin is not at Pin 4, enable and adapt the following line:
SdPlay.setSDCSPin(10);
// Select between SSDA_MODE_FULLRATE or SSDA_MODE_HALFRATE (62.5kHz or 31.25kHz)
// and the output modes SSDA_MODE_MONO_BRIDGE, SSDA_MODE_MONO or SSDA_MODE_STEREO
if (!SdPlay.init(SSDA_MODE_FULLRATE| SSDA_MODE_MONO
)) {
Serial.println(F("initialization failed. Things to check:"));
Serial.println(F("* is a card is inserted?"));
Serial.println(F("* Is your wiring correct?"));
Serial.println(F("* maybe you need to change the chipSelect pin to match your shield or module?"));
Serial.print(F("Error code: "));
Serial.println(SdPlay.getLastError());
while(1);
} else {
Serial.println(F("Wiring is correct and a card is present."));
}
}
void loop(void) {
uint8_t count=0, c, flag;
Serial.println(F("Files on card:"));
SdPlay.dir(&DirCallback);
ReEnter:
count = 0;
Serial.println(F("\r\nEnter filename (send newline after input):"));
do {
while(!Serial.available()) ;
c = Serial.read();
if(c > ' ') AudioFileName[count++] = c;
} while((c != 0x0d) && (c != 0x0a) && (count < 14));
AudioFileName[count++] = 0;
Serial.print(F("Looking for file... "));
if(!SdPlay.setFile(AudioFileName)) {
Serial.println(F(" not found on card! Error code: "));
Serial.println(SdPlay.getLastError());
goto ReEnter;
} else {
Serial.println(F("found."));
}
Serial.println(F("Press s for stop, p for play, h for pause, f to select new file, d for deinit, v to view status."));
flag = 1;
while(flag) {
SdPlay.worker();
if(Serial.available()) {
c = Serial.read();
switch(c) {
case 's':
SdPlay.stop();
Serial.println(F("Stopped."));
break;
case 'p':
SdPlay.play();
Serial.println(F("Play."));
break;
case 'h':
SdPlay.pause();
Serial.println(F("Pause."));
break;
case 'd':
SdPlay.deInit();
Serial.println(F("SdPlay deinitialized. You can now safely remove card. System halted."));
while(1) ;
break;
case 'f':
flag = 0;
break;
case 'v':
Serial.print(F("Status: isStopped="));
Serial.print(SdPlay.isStopped());
Serial.print(F(", isPlaying="));
Serial.print(SdPlay.isPlaying());
Serial.print(F(", isPaused="));
Serial.print(SdPlay.isPaused());
Serial.print(F(", isUnderrunOccured="));
Serial.print(SdPlay.isUnderrunOccured());
Serial.print(F(", getLastError="));
Serial.println(SdPlay.getLastError());
Serial.print(F("Free RAM: "));
Serial.println(freeRam());
break;
}
}
}
} |
发表于 2013-6-23 00:26:31
楼主
