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what I read is that the accelerometer is not 0 when the wiimote is not moving but has some gravity value (~9.8 in europe latitude I think).
Here is a quote found on the wiki from Wiili.org
http://www.wiili.org/index.php/Wiimote#Motion_Sensor
so, even if you are playing tennis in 0 gravity thinking accelerometer only will do the work, I doubt it will work very well because it's lacking of the gravity to affect the accelerometer to good value. If you make right/left movement, it will think your are doing a down movement too, 0g = let the wiimote falling. You would have to move always up (up to 9.8g) to do horizontal movement only, and further up (more than 9.8g acceleration) to really go up.
Of course, I can't validate what I'm saying.
I would like to know the good answer too.
Here is a quote found on the wiki from Wiili.org
QUOTE said:Thus, at rest on a flat table, the accelerometer reports vertical force of +g (the mass can be normalized away into the aribitrary units), and when dropped reports a force of nearly zero.
http://www.wiili.org/index.php/Wiimote#Motion_Sensor
so, even if you are playing tennis in 0 gravity thinking accelerometer only will do the work, I doubt it will work very well because it's lacking of the gravity to affect the accelerometer to good value. If you make right/left movement, it will think your are doing a down movement too, 0g = let the wiimote falling. You would have to move always up (up to 9.8g) to do horizontal movement only, and further up (more than 9.8g acceleration) to really go up.
Of course, I can't validate what I'm saying.
I would like to know the good answer too.