This is a small arduino sketch for Teensy that allows the user to select files from the SD card via a screen interface. It automatically updates the file list
Here is link to a video of it working: https://www.youtube.com/watch?v=s70NMAwVmYs&feature=gp-n-y&google_comment_id=z12ye1xotsjnv5svf23eij5y0vesgdfgm04 https://youtu.be/s70NMAwVmYs