Below are version 1 pictures of the Hobbybotics Photo Interrupter based on the CNZ1120. I screwed up a bit when I designed this board as I created the footprint for the CNZ1120 photo interrupter backwards. It still worked out in the end and I actually like it this way as it allows me to place the interrupter on one side of the board with the rest on the components on the opposite side.  I also screwed up a bit in the schematic with the placement of the LED.  This little mistake was fixed by simply removing the LED and associated resistor from the final board.  In the end, it still works!