I«m working on a project for a Paintball-team.
I«m building a chronograph to measure the V0
(velocity of the ball when it leaves the barrel)
of the paintball.

So far I«m finished with the input/output
hardware, LED for indication and IRED and
PIN-diode for input. I«m thinking about 16c84,
is that a good choice?

I«m measuring the time it takes for the ball
to travel a given length and then i calculate
the speed.

I want to measure the time it takes for the ball
to travel 1 foot and then divide 1 with the time.

What«s the best way to measure the time (for me)
with a 16F84?
How do I calculate the speed?