That is awesome!
I've done some Arduino projects years ago.
I'd like to submit another option. The crown royal bag and a bunch of 124 gn bullets. Cheap and works! I recently did all my trigger testing on a twitch stream using that method. I was surprised at how accurate it was, no break, add 10 bullets, no break add 10 more, break, calculate, write it down. A bit of error for gravity but I'll take it.