Gas gauge calibration unit

I found I could not load a phone video to youtube greater than 20 mb, so I made a short one. It has to do with email to youtube upload url.

That pot easier for me now than a sender, much less table space.

Now I am working on routine to blink LED to indicate cal modes, and way to enter and exit cal modes. I getting the job done, but my code is fairly crude. I am gaining experience working on a user interface consisting of only two buttons and a LED.

I may need help to find a better way. I will post when I have something that works and perhaps someone will have a better idea.