Motorized venetian blind system

A load control system for controlling the amount of sunlight entering a space of a building through a window located in a façade of the building to control a direct sunlight penetration distance within the space and a reflected sunlight penetration distance on a ceiling of the space, the load control system comprising:

• a motorized venetian blind system having a bottom rail and a plurality of rectangular slats that extend across the width of the window;
• and
• a central controller operatively coupled to the motorized venetian blind system, the central controller operable to transmit digital commands to the motorized venetian blind system, the controller further operable to
• receive a desired maximum direct sunlight penetration distance, a desired maximum reflected sunlight penetration distance, and a minimum time period that may occur between any two consecutive movements of the motorized venetian blind system;
• calculate a controlled bottom rail position to which the bottom rail of the motorized venetian blind system should be controlled and a controlled tilt angle to which the slats of the motorized blind venetian system should be tilted during each of a plurality of consecutive time intervals, such that the sunlight penetration distance does not exceed the desired maximum direct sunlight penetration distance and the reflected sunlight penetration distance on the ceiling of the space will not exceed the desired maximum reflected penetration distance during each of the respective time intervals, the time intervals having lengths greater than or equal to the minimum time period that may occur between any two consecutive movements of the motorized venetian blind system;
• and
• automatically adjust the position of the bottom rail to the controlled bottom rail position and the tilt angle of the slats to the controlled tilt angle at the beginning of each time interval, such that the sunlight penetration distance will not exceed the desired maximum direct sunlight penetration distance and the reflected sunlight penetration distance does not exceed the desired maximum reflected sunlight penetration distance during each of the respective time intervals, and the movements of the motorized venetian blind system are spaced apart by at least the minimum time period that may occur between any two consecutive movements of the motorized venetian blind system.