Arduino darkroom timer #1 - prototype

So, time has come to make myself a printing darkroom timer. It has been more than a year I wrote about android darkroom timer app I use . It is very helpful app and I can only recommend it. But I also wrote about how I hate touchscreens and that is still true. What I often dream about is one physical device, with one purpose and big physical buttons that I can smash and stuff happens right away…