https://github.com/TMRh20/TMRpcm/wiki
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Arduino library for asynchronous playback of PCM/WAV files direct from SD card
Requires Arduino, SD card and output device (Speaker, Headphones, Amplifier, etc)
Features
PCM/WAV audio playback direct from SD card
Asynchronous Playback: Allows code in main loop to run while audio playback occurs.
Playback uses a single timer: Timer 1 (Uno,Mega) or Timer 3,4 or 5 (Mega)
Supported formats: WAV files, 8-bit, 8-20khz Sample Rate, mono
Complimentary or Dual Outputs - see examples
Supported devices: Arduino Uno, Nano, Mega, etc.
Files easily converted using iTunes or other software:
Click > Edit > Preferences > Import Settings
Change the dropdown to WAV Encoder and Setting: Custom > 16.000kHz, 8-bit, Mono
Right click any file in iTunes, and select "Create WAV Version"
Copy file to SD card using computer
Functions
tmrpcm.play("filename"); plays a file
tmrpcm.speakerPin = 11; set to 5,6,11 or 46 for Mega, 9 for Uno, Nano, etc
tmrpcm.disable(); disables the timer on output pin and stops the music
tmrpcm.stopPlayback(); stops the music, but leaves the timer running
tmrpcm.isPlaying(); returns 1 if music playing, 0 if not
tmrpcm.pause(); pauses/unpauses playback
tmrpcm.pwmMode = 1; **REMOVED**
tmrpcm.volume(0); 1(up) or 0(down) to control volume
Known Limitations
This library is very processor intensive, so code execution during playback will be slower than normal
Processing load can be reduced by using lower quality sounds encoded at a lower sample rate (8khz minimum)
May interfere with other libraries that rely on interrupts. The isPlaying() function can be used to prevent parallel code execution.
Update to volume control allows greater range in low volume control, but will distort if volume too high
Installation
Download current package: https://github.com/TMRh20/TMRpcm/archive/master.zip
See the Manual Installation section at: http://arduino.cc/en/Guide/Libraries
Contributed How-To with Video: http://maxoffsky.com/maxoffsky-blog/how-to-play-wav-audio-files-with-arduino-uno-and-microsd-card/
Details at TMRh20.blogspot.com |
发表于 2013-8-10 11:00:54
楼主