SimpleSDAudio

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 the 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 or headphone 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 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.