METHOD OF CALIBRATING A MOTORIZED ROLLER SHADE

摘要

Calibration of a motorized roller shade is accomplished by calculating a radius of a roller tube and thickness of a shade fabric rotatably supported by the roller tube. First, a lower edge of the shade fabric is moved to a fi rst position at a first linear distance from a predetermined position. Secon d, a first number of revolutions of the roller tube between the first positi on and the predetermined position is determined. Next, the lower edge of the shade fabric is moved to a second position at a second linear distance from the predetermined position and a second number of revolutions between the s econd position and the predetermined position is determined. Finally, the tu be radius and the fabric thickness are calculated from the first and second linear distances and the first and second numbers of revolutions. The tube r adius and the fabric thickness are used to control the linear speed of the l ower edge of the shade fabric.