Optical Sensors

[Ulibrium]

Yo,

How do you hook optical sensors up? I got one blue wire, one brown wire, one black wire, and one white wire. There is a diagram on that is a little confusing. What I did was I connect the brown wire to one of the digital input pins on the RC, and the blue wire to a ground pin. My result was the switch bit constantly set to 1. My impression from the diagram was to tie the black and white wire together, but it didn't seem to change anything.

Also, I don't have any reflective tape to test this with. I was trying to change the response by covering and uncovering the sensor but that was of no use. Do I absolutely need reflective tape?