METHODS AND APPARATUS FOR DETERMINING THE ORIENTATION OF A TIRE MOUNTED DEVICE

A method of determining an orientation of a tire mounted device with respect to a wheel rim using an acceleration sensor, With the wheel in a designated orientation and not rotating, a polarity of acceleration along a vertical axis is determined. Then it is determined which of a first absolute orientation or a second absolute orientation the tire mounted device is in depending on the determined polarity. The determined absolute orientation is correlated with the designated orientation to determine which of a first or second orientation with respect to the wheel rim the tire mounted device is in.