Well, what I kept working on was the case. I was thinking that the right way is to make three separate parts: the back part where a phone case fits (thinking in this case), the front part where there are holes for the display, keys/buttons, etc., and the sliding cover with the tracks. This one, when using a normal calculator, usually fits on the back of the body and when not, it fits on the front, storing and protecting the screen. In my ideas, I asked Gemini to generate these images to help me clarify my thoughts and development. It turned out good!

Another thing is that I noticed the display PCB module isn’t centered relative to the screen at all. Because of this, due to the width of the PCB and the case ending up close to the display module, it can’t be centered since there’s little free area for horizontal movement and the board would already touch the case walls. I made this 3D model to see roughly how it would look, and it looked weird. Not too much, but… The thing is, I usually do some stylizations, drawings, stuff like that.

It would be possible to put a solar panel there, yeah, but I’m not going to go back much to that part of the EDA and rethink the system, mechanics, and circuit logic.