Tracking a position of a motorized window treatment

A method for controlling a motor of a motor drive unit to adjust a position of a covering material of a motorized window treatment, the method comprising:

• controlling the motor to rotate a shaft of the motor to adjust the position of the covering material;
• receiving sensor signals that are generated by a sensor circuit of the motor drive unit and indicate a position of the covering material;
• determining present states of the sensor signals generated by the sensor circuit;
• updating a present position of the covering material in response to changes in states of the sensor signals generated by the sensor circuit;
• when powering up the motor drive unit, setting power-up states equal to the present states of the sensor signals generated by the sensor circuit;
• determining predicted states of the sensor signals generated by the sensor circuit based at least in part on a power-down position recorded at a first time and a final position recorded at a second time after the first time, the power-down position is recorded due to a magnitude of a voltage for the motor drive unit falling below a low-voltage threshold;
• comparing the predicted states with the respective power-up states;
• and
• updating the present position of the covering material based on the comparison of the predicted states and the respective power-up states.