The EyeWriter 2.0

Step 7 Hardware: Infrared LED's

IR LED's

• Gather 8 Infrared (IR) Light-Emitting Diodes (LED) and a small round Printed Circuit Board (PCB).
   
• To build LED arrays on the PCBs youll need to know the positive and negative ends of each LED. Generally speaking the longer leg of the LED is the anode (positive), and the shorter leg is the cathode (negative). see image here
  
  On most LEDs, there will also be a flat spot on the cathodes side of the lens.
  From overhead, take note of which direction the wire bond points relative to positive and negative.



• Setup a circuit of 4 LEDs in series, in parallel with another set of 4 LEDs in series.see image here Clip the legs of the LEDs and solder them together.
  see image here



• After soldering the LED legs together to form the circuit, solder about 2 feet (60 centimeters) of the red & green intercom wire to the LED circuits positive & negative ends.see image here



• To test the LED PCB panel, build the circuit below. Look carefully to see if your IR LEDs are glowing a faint red. see image here



• After confirming your IR LEDs are working, cover the back of the LED PCB panel with hot glue to keep all connections in place.



• Repeat steps 1 - 5 above to create another LED PCB panel.



• Using a larger round PCB, carefully drill press a hole into the center of the board. see image here



• On the outer rim of the PCB, build a circuit of 4 parallel sets of 4 LEDs in series. The placement of the LEDs should allow the PS Eye camera to fit through snugly, without the camera blocking the LEDs. see image here



• After soldering the LED legs together to form the circuit, solder wiring to connect all 4 positive ends together and all 4 negative ends together, putting all 4 LED sets in parallel. see image here



• Solder about 2 feet (60 centimeters) of the red & green intercom wire to the LED circuits positive & negative ends.



• To test the larger LED PCB panel, build the circuit below. Look carefully to see if your IR LEDs are glowing a faint red. see schematic here



• After confirming your IR LEDs are working, cover the back of the LED PCB panel with hot glue to keep all connections in place.