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Also, what does the Green LED on arduino pin SCK(D13) do? Is it just show when the SPI is active? I'm not using the SPI, so I thought I might use it to show when a file is playing. I'd have to use my own timers to estimate that, right? There's no feedback from the codec to tell me when a track has finished playing? Thank you!
The guide says VIN can be 3.3V to 6V while the schematic says 3.3V to 9V input on VIN but it looks like the VLSI cutsheet says 5.5V.. so I guess I answered my question?
Can you use this FTDI instead? https://www.sparkfun.com/products/13263
That will work as well.
I'm confused - how do you upload code to the soundie? It doesn't have a USB port.
For Arduino programming you'll need a 3.3V FTDI breakout board just like you would to program a pro mini. If you'd like to update the firmware on the VSLI chip you'll need the VSIDE IDE and use the UART pins on the right side of the board to program it.
How many audio files can the Papa Soundie can play at the same time?
The Papa Soundie can only play 1 audio file at a time. If you are looking to play or mix multiple files (up to 14 stereo tracks) I'd recommend the SparkFun WAV Trigger.
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