This is probably a silly question...
what are the boxes that the photo gels insert into? I don't seem to have any in my kit.
They're from the wood cutout you should now have your UNO and breadboard attached to. You'll notice a little 'E' on them.
Thanks for the response! I kind of figured it was supposed to be those, but turned one direction it would just slide right down the sensor and turned the other direction I couldn't get the sensor to fit at all.
No worries though, I just made a little paper tray to hold them.
Now I just wish the green part of that LED light worked (sounds like a lot of people have a non-working green part).