ECEN 390 - Laser Tag Project

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The basic laser tag system packing consists of three main pieces.
  - Gun
  - Power supply (i.e. battery)
  - Interface box

====== Gun ======
The laser tag gun {{:gun_side.jpg?200|}} 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 {{:final_gun.jpg?100|}}. 

====== Interface Box ======
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 {{:box_connections.jpg?200|}}. 

**Note: Note proper polarity as you attach the ribbon cable to the ZYBO board. The red line on the ribbon cable should be closest to the white breadboard.**

This figure {{:laser_tag_box2.jpg?200|}} shows the Analog Interface is where the analog boards (what you will build in ECE340) will plug in.  The Digital Interface is where the ZYBO board will be plugged in.  The analog interface board {{:board_back_front_2.jpg?200|}} has four connections (a) connects to the transmitter board, (b) connects to the receiver board, (c) connects to the gun photodiode, and (d) connects to the other gun components.  The interface board also has a switch (e) that connect the receiver board to the 9V battery.  There is no on/off switch for connection to the USB power.

The transmitter connection {{:board_front_2.jpg?200|}} connects to components on the gun and to the ZYBO board (digital interface ribbon cable).  Here is the list of connection going from right to left.

  - USB Ground
  - Transmitter digital signal from ZYBO board
  - Black wire on gun (transmitting LED wire)
  - Trigger signal to ZYBO board
  - Yellow wire on gun (gun trigger connection)
  - Hit indicator digital signal from the ZYBO board
  - Green wire on gun (Hit Indicator LED)
  - USB +5V

The receiver connection {{:receiver_connection.jpg?200|}} connects to components on the gun and to the ZYBO board (digital interface ribbon cable).  Here is the list of connection going from right to left.

  - Ground and ADC IN -
  - Not Connected
  - Not Connected
  - ZYBO ADC IN +
  - Not Connected
  - Not Connected
  - Not Connected
  - Not Connected
  - Gun photodiode signal
  - Not Connected
  - Not Connected
  - +9V
ECEN 390 - Laser Tag Project

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