I would like to make a chronograph for my airsoft hobby.
The software and screen is easy enough, but making a relatively high speed optical sensor for the BB is a little beyond my abilities.
So the question is: Are you aware of a breakout board or similar kind of ready made solution which uses a photodiode capable of switching at frequencies around 400-ish kHz?
I need only a binary output to trigger an interrupt.
(my guesstimated necessary sensitivity, based on the velocity and size of the BB as well as the mechanical design)