I'm trying to essentially build a Raspberry Pi powered pachinko machine, where I need to detect when a magnetic marble falls through a gate/opening/region. Are there any electrical components/breakout boards/ideas I could use to detect such an occurrence? I've been debating on using a Hall Effect Ratiometric sensor paired with an ADC converter and GPIO ports to detect magnetic fluctuation to detect when the marble passes, but I didn't know if there were any better ideas. Maybe some sort of gate that won't mess with the marble's trajectory? A light or motion sensor? Something that can quickly detect the marble's presence?
For reference, here are the magnetic marbles that I'm using. I'm using a Pi Zero too.