Multipurpose controller for multistate windows

A window controller for controlling one or more windows capable of undergoing reversible optical transitions, the window controller comprising one or more microprocessors configured to control functions of the one or more windows, the functions comprising:

• (a) measuring transmittance of at least one of the one or more windows based on current information measured at the at least one window;
• (b) actively and reversibly powering a reversible optical transition between at least a bleached end state and a colored end state of the at least one window, wherein powering is based on the measured transmittance of the at least one window, wherein the at least one or more windows comprises a first conductive layer, a second conductive layer, and an electrochromic layer between the first conductive layer and the second conductive layer, wherein powering the reversible optical transition comprises applying a DC voltage to the first conductive layer and to the second conductive layer to provide an electrical potential across the electrochromic layer establishing a load, wherein the load is floated;
• and
• (c) communicating between the window controller and a separate communication node.

A window controller for controlling a window capable of undergoing reversible optical transitions, the window controller comprising:

• a voltage regulator;
• a voltage control amplifier for generating current to power the window;
• and
• a microprocessor powered by the voltage regulator, the microprocessor configured to control the functions of:
• actively and reversibly powering a reversible optical transition between at least a bleached end state and a colored end state of the window based on window data received from memory embedded in the window and separate from the window controller, wherein the window data includes measured transmittance of the window, wherein the window comprises a first conductive layer, a second conductive layer, and an electrochromic layer between the first conductive layer and the second conductive layer, wherein powering comprises applying a DC voltage to the first conductive layer and to the second conductive layer to provide an electrical potential across the electrochromic layer establishing a load, wherein the load is floated;
• communicating between the window controller and a separate communication node;
• and
• storing the window data to the memory.