Film developing tank agitator withg Arduino Nano and servo

Developing film often requires tipping the film tank over a intervals of 1 minute or 30 seconds, which is tedious for longer developing times as the intervals are too short for doing something else at the same time.
I've build a machine that does the interval agitation for me.
An Arduino Nano controls a servo and a tiny OLED display that shows elapsed time and number of inversions.
This is a prototype quickly hacked together from scrap plywood.
I'll add a switch for different agitation patterns