The present invention is an apparatus, system, method, computer program, and computer program product for controlling window coverings to adjust admitted daylight. More particularly, the present disclosure plates to a control system for controlling the amount of daylight admitted through adjustable window coverings. In an embodiment of the present invention, the system includes a stand-alone open loop proportional control subsystem including a calculation or algorithm that is operable to convert a sunlight sensor signal to a blind slat position based on a predetermined curve stored in memory. In another embodiment of the present invention, the system is operable to transmit the sunlight sensor information, for example, such as in Lux, to an external system, which may then provide blind slat position requests based on some other curve, algorithm, or user need. The blind slat position may be controlled by the system to avert undesirable solar heat gains and also achieve significant daylight harvesting.

A sensor and/or system controller may process an image multiple times at multiple resolutions to detect glare conditions. A glare condition threshold used to determine whether a glare condition exists may be based on the resolution of the image. When the resolution of the image is higher, the glare condition threshold may be higher. The sensor and/or system controller may organize one or more adjacent pixels having similar intensities into pixel groups. The pixel groups may vary in size and/or shape. The sensor and/or system controller may determine a representative group luminance for the pixel group (e.g., an average luminance of the pixels in the group). The sensor and/or system controller may determine a group glare condition threshold, which may be used to determine whether a glare condition exists for the group of pixels and/or may be based on the size of the group.

A sensor and/or system controller may process an image multiple times at multiple resolutions to detect glare conditions. A glare condition threshold used to determine whether a glare condition exists may be based on the resolution of the image. When the resolution of the image is higher, the glare condition threshold may be higher. The sensor and/or system controller may organize one or more adjacent pixels having similar intensities into pixel groups. The pixel groups may vary in size and/or shape. The sensor and/or system controller may determine a representative group luminance for the pixel group (e.g., an average luminance of the pixels in the group). The sensor and/or system controller may determine a group glare condition threshold, which may be used to determine whether a glare condition exists for the group of pixels and/or may be based on the size of the group.

Techniques including winding, by using an electric motor of the architectural covering, a blind of the architectural covering in a first direction. The techniques further include stopping the winding by the electric motor of the blind in the first direction at a programmatically adjustable wound end position. The techniques further include upon the blind reaching the programmatically adjustable wound end position, winding, by using the electric motor, the blind in an opposite direction to a second position relaxing at least a cord of the blind that is wound by a cord winding/unwinding unit driven by the electric motor, the difference between the programmatically adjustable wound end position and the second position being an amount less than that which would result in movement of the blind to a fully extended position and set based on a length of the blind.

Disclosed is a system for responsive daylight control using an electronically actuated shading device. Optionally, the system has a longer response time in opening the shading than in closing the shading. Optionally, the system inhibits opening of the shading device in the presence of a fluctuation in the daylight level. Optionally, the response time in opening the shading is increased when the system is powered by a battery and/or with decreasing battery charge.

Techniques include increasing a rotation speed of an electric motor configured to wind the architectural covering over a first time period to a first rotation speed. The techniques further include responsive to the first rotation speed being reached and after the first time period, rotating the electric motor at the first rotation speed for a second time period. The techniques further include after the second time period, increasing the rotation speed of the electric motor over a third time period to a second rotation speed.

Motorized window treatment systems are disclosed. A motorized window treatment system may include a covering material, a sensor circuit, and a control circuit. The sensor circuit may be configured to generate sensor signals indicative of a position of the covering material. The control circuit may be configured to determine a present sensor state of the sensor circuit, determine a predicted sensor state for 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, compare the predicted sensor state with the present sensor state, and determine a present position of the covering material based on the comparison of the predicted sensor state and the present sensor state. Methods of adjusting a position of a covering material of a motorized window treatment also are disclosed.

Motorized window treatment systems are disclosed. A motorized window treatment system may include a covering material, a sensor circuit, and a control circuit. The sensor circuit may be configured to generate sensor signals indicative of a position of the covering material. The control circuit may be configured to determine a present sensor state of the sensor circuit, determine a predicted sensor state for 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, compare the predicted sensor state with the present sensor state, and determine a present position of the covering material based on the comparison of the predicted sensor state and the present sensor state. Methods of adjusting a position of a covering material of a motorized window treatment also are disclosed.