Despite the initial investment, solid state lighting (SSL) has proven to be a viable alternative over conventional technologies due to the combined savings in energy consumption and maintenance costs, as well as design flexibility. Furthermore, increased energy savings can be realized with active intelligence such as occupancy and ambient light sensors, as well as external dimming controls to eliminate excessive lighting. Since there are a wide variety of constant current LED drivers requiring a 0-10 volt DC input for dimming control available, the focus of this discussion will be utilizing these drivers with a wireless interface.
The overall concept is relatively straightforward. A data stream containing the desired control voltage is transmitted and then received by a module that has been configured to act as a transparent RS-232 interface to a microcontroller. The microcontroller in turn interprets the data stream and loads the appropriate values into the data registers of a digital-to-analog converter to produce the desired control voltage.