"To determine its position relative to the console, the Wii needs a" sensor bar ", connected to the console, which is placed above or below the television. This bar has two Infrared LED series, that the mark thanks to a Wiimote IR sensor. Thanks to these two series of LEDs, the Wiimote can quickly and precisely calculate its position relative to the bar and point to a specific point on the screen. But it it needs to be pointed roughly towards the screen (so as to have the bar in his "field of vision)." To use the gyroscope and the function pointer of the Wiimote, you will need a "sensor bar" artisan, unless you prefer to leave turn on your Wii while you use your Wiimote on a PC. ... Here's a little diagram of the assembly to create:
I used a power supply 6V/300mA max for my 4 LED. It takes between 1.2 V and 2V LED to have sufficient intensity without burning out the components ...
It takes 25 cm difference between the 2 LED, you can adapt depending on the size of your screen, and the distance at which you will use the Wiimote.
Here are photos of the "DIY"
Operating: 
And this time, with the night vision mode (to see the light infrared):
EDIT: Here is a comment Eldrad to calculate the resistance: "So to be clear to calculate resistance must know Ohm's law which is U = R * I therefore R = V / I
For example you have 2 blue LEDs and two infrared LEDs (which you meter in series> (ir + ir + blue + blue) must take the threshold voltage and covered by each subtract to the value of your diet (because the LEDs are live). For example: They
blue led = 3.5V
Us infrared LED = 1.5V
And we posédons power 12V U-USB1-so-Usir1 Usir2 -USB2 
12-3.5-1.5-1.5-3.5 = = 2V
12-3.5-1.5-1.5-3.5 = = 2V Now to know the value of the resistance I take this value and I divided by the number of intensity that I've happens in the LEDs eg 2 / 20 = 0.1 100 ohm night:) (I took 20mA for the LED does not fuck ps = do not exceed 30 mA) and voila
I value my resistance. Or 100 ohm:) "
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