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Thread: Is this how a wiimote works?

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    Is this how a wiimote works?

    A friend gave mii a broken sensor bar to try and fix (just for the hell of it). I took it apart and was surprised to see that the only thing in it was several IR LEDs and a couple of resistors. My theory is that the sensor bar is not a sensor bar at all but more of a transmitter/light source for the wiimote. If the wiimote is the IR receiver and moves the cursor on the screen based its position according to the source it would then have to transit that data back to the wii via bluetooth. Is this correct? This would explain how the wireless sensor bars work and why sunlight messes with my cursor when shining at my wiimote.

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    The sensor bar is for the ir frequencies and the bluetooth module is inside the wii itself. The sensor bar is used for the pointer, but does not sense the other things that the bluetooth module does. So it needs direct line of sight to work and yes ultraviolet light will interfere with it.
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    So are you saying that the sensor bar really is a sensor? If so then how does the wireless sensor bars work since they are not hardwired to the wii? And why would UV light mess with my cursor when the sunlight is hitting my wiimote? From what I could tell when I took one apart is that all it had was 9VDC power source and nothing else to transmit data back to the wii. I was guessing that all communications back to the wii was bluetooth including the cursor position and the position was just measured via IR.

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    What I am saying is that the sensor bar works the same way as any sensor on any device. Like the sensor on a television works with a regular remote control and light sources can affect that. As far as a wireless sensor bar, I don't know, that is not standard issue with a purchase of a new wii.
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    This is a partial copy and paste from wikipedia. I know that you can't always believe what wikipedia says but it confirms my theory.

    Sensing

    Use of the Sensor Bar allows the Wii Remote to be used as an accurate pointing device up to 5 meters (approx. 16 ft) away from the bar. The Wii Remote's image sensor is used to locate the Sensor Bar's points of light in the Wii Remote's field of view. The light emitted from each end of the Sensor Bar is focused onto the image sensor which sees the light as two bright dots separated by a distance "mi" on the image sensor. The second distance "m" between the two clusters of light emitters in the Sensor Bar is a fixed distance. From these two distances m and mi, the Wii CPU calculates the distance between the Wii Remote and the Sensor Bar using triangulation. In addition, rotation of the Wii Remote with respect to the ground can also be calculated from the relative angle of the two dots of light on the image sensor. Games can be programmed to sense whether the image sensor is covered, which is demonstrated in a Microgame of Smooth Moves, where if the player does not uncover the sensor, the champagne bottle that the remote represents will not open.

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    The "sensor" bar senses nothing, it just contains infrared lights. Google "Johnny Chung Lee" to see some cool hacking that tricks the wiimote by doing things like adding infrared lights to glasses to do head tracking.

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    Probably said already, but the sensorbar just emits IR light, it receives nothing. You can use two candles for that matter, just make sure they are at the same distance as the LED's. I think you can make a battery-powered sensorbar too, to make the mess between the TV and wii a bit less. Just measure the power going into the sensorbar with a voltmeter, and replace the plug with a battery-source providing the same amount of voltage. (Shorten the length of the cable ofc, or the point of a chordless wii-connected sensorbar is somewhat gone).

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    Ya, I understand them a lot more now then what I did when I asked the question originally. I googled Johny Chung Lee as xxbeanxx suggested and was amazed with what he can do with one.

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