AVR-Chat

This isn't my experience.  I find wide variations among sensors -
particularly after soldering them into boards.  Even sensors that are
suppose to have tight tolerances.  And incidental environmental light can
make the situation even worse.

-----Original Message-----
From: Wagner Lipnharski
...

If using the same kind of phototransistor and light source, the
environmental error will be common to both, including the time response of
the thing.  The first will sense the blocker object (projectile) the same
exactly way as the second, so, a lazy sensor will answer late the same way
as the second.  The time delay between both sensors will be the same, no
matter temperature, air pressure or anything else.  I am considering two
exactly the same sensors and light source, also physical installations.

It would be different if only one sensor is to be used.  The sensor could
measure the darkness period of time, in true it would be measuring how long