Why I started with this project?
Sometimes I shoot film and it really takes a lot of extra time to get the phone with an app which will show me the proper exposure. So once I stumbled across an Arduino project on GitHub and decided that I want to do one myself. But more elegant, obviously.
Which PCB Design Tool I use and why?
I am coming from Mechanical Design, so my choice is Fusion 360 for both PCB and enclosure stuff.
What’s my greatest fail with the project?
The first batch of PCBs I ordered was my first order on Aisler at all, so I didn’t really check with the design rules 
What’s my greatest win in the project?
Continue learning new stuff. Also on my own mistakes 
So this is an ATmega328P based board (basically, re-packed Arduino Nano) with a light sensor and a display. I also managed to find a battery that perfectly fits between the board and display for some portability. Still need to make one more iteration and add a step-up converter for getting stable 5V when powered from the battery. After that, I will publish the repository with code in case someone wants to build one too