Play audio files with your Arduino in decent quality from SD card, only very few additional hardware required.
Features
- 8-Bit PWM output - no external DAC required
- 62.500 kHz (fullrate) / 31.250 kHz (halfrate) sampling rate @ 16 MHz
- 31.250 kHz (fullrate) / 15.625 kHz (halfrate) sampling rate @ 8 Mhz
- Mono, bridge and stereo mode
- RAM usage ~1.3 kByte
- ROM usage ~6.1 kByte
- Integrated SD library (minimal FAT only, optimized for low RAM usage and high performance)
- Works with most SD card shields that are hooked to SPI port
- Easy to use: 1. init library, 2. select audio file, 3. call play, 4. call worker while audio is playing
- Supports SD and SDHC cards formated with FAT16 or FAT32
Restrictions
- Audio file must be converted prior use
- Audio files must reside in root directory of card
- File name of audio file must be in 8.3-format
- Audio file must reside completely non-fragmented on card
- fullrate and stereo actually leads to buffer underruns
Quickstart guide
- Install library: Unzip all to your /libraries/ folder.
- Copy file /libraries/SimpleSDAudio/examples/example.raw to root folder of a freshly formated SD card (don't use quick format!)
- Connect SD card to your Arduino board (using shield or whatever, SD card's chip select should go to pin 4, all other to SPI pins)
- Connect a speaker, headphone or line-in via 100 ohm resistor in series to audio output pin (pin 9 on Arduinos with ATmega168/328, pin 44 on Arduinos with ATmega1280/2560). Connect other end of speaker/ground of line-in to GND
- Launch Arduino IDE and try example "BareMinimumWithDebug" first
- You should hear some audio. Activate serial monitor to find some information if it does not work. Maybe you have to adjust SD cards CS pin in sketch.