Sensor Bar
From WiiLi
The sensor bar is powered by the Wii base unit, and contains 2 groups of IR LEDs, spaced 20cm apart on center. There have been reports that the LEDs operate at 940nm. A 900nm 40nm FWHM filter cut reception distance by a factor of 4, and 1000nm 10nm FWHM cut it to inches, suggesting that claims are reasonable. Each group is composed of 5 LEDs, but homemade sensor bars have been effective with fewer LEDs, so long as the intensity is sufficient. The cable from the Wii to the sensor bar only carries power. No information is passed either to or from the sensor bar, and the intensity is not modulated in any way.
<000> <000>
The two outer LEDs are angled outward and the two inner LEDs are angled inward. This improves the range of the sensor bar. The distance between the middle of the left cluster and the middle of the right cluster is approximately 7.5 inches (19.05 centimeters).
Wii output to sensor bar is 12V DC, unless it should work even with 9V battery.
