Dual Teflon Rodent Odor Port

In my new rat behavior box, I am putting in a dual odor port.  This lets me do comparisons between two independent odor lines.  I just assembled the new odor ports with beam break detectors that will activate when the rat pokes its nose into the port.  The ports are designed to be small so that odor onset is fast. Here is a picture of the new ports:

 In the middle there are some LTE 302 emitters facing out and on the sides there are LTR-301 receivers.  There are several ports on the back for odor injection.  On the top is a vacuum suction.

I am now making a controller for these ports with an Arduino Nano.