Wii Remote IR Camera Hack with Arduino Interface

Step 2 Interface Circuitry

We'll need a small circuit to interface the IR camera to the arduino. I got all my information from other sources. Here is an exhaustive list:

This fellow (kako) seems to be the first. Here are his pages translated. (Please note that the various translation services online all give slightly different results. It is useful to try several of them.)
http://translate.google.com/translate?u=http%3A%2F%2Fwww.kako.com%2Fneta%2F2008-009%2F2008-009.html&hl=en&ie=UTF-8&sl=ja&tl=en
http://babelfish.yahoo.com/translate_url?doit=done&tt=url&intl=1&fr=bf-home&trurl=http%3A%2F%2Fwww.kako.com%2Fneta%2F2007-001%2F2007-001.html&lp=ja_en&btnTrUrl=Translate

Johnny Lee did his part as well and he has some good information:
http://procrastineering.blogspot.com/2008/09/working-with-pixart-camera-directly.html

But the most useful information came from Stephen Hobley. He is going to supply us with the arduino Wii camera library which we will use while programming.
http://www.stephenhobley.com/blog/2009/02/22/pixart-sensor-and-arduino/
http://www.stephenhobley.com/blog/2009/02/24/all-in-one/
http://www.stephenhobley.com/blog/2009/03/01/pixartwiimote-sensor-library-for-arduino/

Ok, to the circuit. We need the clock circuitry and the i2c interface. Do you want to undertand i2c? Don't ask me: http://en.wikipedia.org/wiki/I%C2%B2C

Here is a direct link to the schematic shown below (so you can actually read it.) http://stephenhobley.com/blog/wp-content/uploads/2009/02/wiicam_schem.gif

The clock is pretty simple. You need two capacitors, a 25 MHz crystal, a 1 Meg Ohm resistor and a 74AC04 inverter logic gate. These are all pretty standard parts, you can get them all from Digikey.com or other online electronics sites.

We'll handle the i2c circuit in the next step.