Figure out audio board
Settled on DFPlayerMini with SD card. This eliminates the USB connector. Tracks are played in order they are written to the card.
This issue can closed once a basic driver (#3) is in place.
Write driver for DFPlayerMini Audio board
Figure out audio board
Best likely candidate so far https://www.adafruit.com/product/2217
- Upload Audio via USB
- Control via UART
- Amplified
- Speaker Connectors