We're going to have 4 opticals on our bot, for some nice AWD action
and 3 more for line tracking.
I was scared cause yesterday i was like "Oh crap do the optical sensors have to be under $200 if we use them with the custom circuit" but since they are not from digi-key or FIA and they are listed us unlimited they do not count toward the $200, @ $61 (plus shipping) a pop, we're glad the ones they gave us in past years were the same model number. The only difference we can tell is the viewable light it emits so you can see where it is hitting.
yay for optical sensors!