The laser tag gun contains 4 main components (1) shooting LED, (2) photodiode, (3) hit indicator LED, and (4) the trigger.

If you are interested the laser tag gun is a modified nerf gun that had a low power spotter LED. The nerf dart portion was removed, the low power LED was replaced with a high power LED, and wiring connections were added. Here is a picture of the internal gun wiring .

The interface box creates connections between the analog boards that you fabricated in ECE340, the ZYBO embedded system board, and the gun. In order to reduce cross-talk between the transmitter and the receiver there are two power supplies. The receiver runs off of a 9V battery contained within the interface box and the ZYBO board and the transmitter both run off of a 5V USB connection. The USB connection can be connected to either a computer, a USB wall plug, or a battery. These connections external to the interface box are shown here .