Hello,
The SD slot position is as far into the center as is possible to keep the tan connector correctly placed.
There are unused pins, but I do not recommend soldering to the connectors as this will damage your ability to connect the boards to each other. Consider a prototyping shield instead:
https://tinycircuits.com/collections/proto-boardsThe pins used by each board are referenced on the product page under the Tech Specs tab, you'll also find the schematics of the boards under the Downloads tab. Check out the product pages:
- TinyScreen+
https://tinycircuits.com/products/tinyscreenplus- SD & Audio TinyShield:
https://tinycircuits.com/collections/memory/products/microsd_audio-tinyshieldVoltage is 3 - 5.5V, also noted under the Tech Specs.
There are some settings available to alter functionality:
https://learn.tinycircuits.com/Kits/TinyTV-Tutorial/Other than that, the source code is open and available for customization:
https://learn.tinycircuits.com/Kits/Tiny-Video-Program/Videos are played in the order they are added to the SD Card. Pay attention to both the main file in the program folder Tiny-Video-Player.ino and videoPlayer.ino for more information on how they are played.
It sounds like you'll have to design something (maybe time-based?) around playing the video and then displaying your utility. The auto playing and looping functionality might help you out in the case that it makes sense to play the full video, and then display your utility. In that way you can "loop" the possible viewing options.
Cheers,
Réna