Wii IR camera as standalone sensor
The Wii Remote became a very intersting tool for hacking and other uses where it not has been mentioned for. After the first hacks appears in the internet a lot of people are doing great stuff with it.
This sensor is great for tracking infrared sources. It can track upto 4 sources independently and give out the coordinates and the strength ob each tracked object. The IR camera has an I2C interface which can be easy accessed by a microcontroller. Here an Arduino board has been used.
Wii Remote disassembling:
To get the IR camera out of the Wii Remote, the Wiimote must be disassembled. A Tri-Wing screw driver has been used for this task. The IR camera is on the front of the board. To get the IR sensor out a hot air gun is been usefull.
This walkthrough only works for an original Wii Remote. There exists some Wii Remote clones, which are cheaper than the original one but they have different sensors with unknown pinout, so be warned!
The schematic slightly differs from Kako's aproach, it has been taken form the CC2 ATM18 project. A quartz oscillator has been used. A frequency bettween 20..25MHz will work. Unfortunately the sensr is a 3.3V device. Some level conversion must be done before connecting it to a 5V Arduino board. The sensor gets it power source from 2 diodes in series with a 5V from the arduino board which give roughly 3.6V. 2 pullup resistors on the I2C pins limits the voltage down to 3.6.
Schematic and a board layout is atached to this article.
- Wii Remote IR Camera (from a original Wii Remote, not a clone!!)
- 24Mhz quartz oscillator (or 25MHz, but not a resonator!)
- 2x diode 1N4148 or equivalent
- 2x elecrolytic capacitor 10uF
- 1x ceramic capacitor 100nF
- 2x resistor 2.2kOhm
- 1x resistor 22kOhm
- perf board 60 x 25 mm
- pin bar 1x4
- pin bar 2x4
- bar jack 2x4
The Arduino control software is also based on Kako's sources. It simply initialise the IR camera sensor and sends the readed blob information to a PC: The sourcecode has been slightly modified to work with the PC software.
An Arduino sketch is attached to this article. At the moment I am working on a processing sketch for graphical represantation of the Wii IR Camera output.
To be continued...