the coding and identification for examination room

摘要

a display system for location numbers in the tables of the examination room. it uses laser beam projectors in parts installed on the ceiling. the laser beams are digits to 7 segments on the table. the lamps are installed in series circuits connected in a linkage projection distribution.the dispatchers are controlled in turn by a central controller which sends the information to display the stage in series. the controller is powered by a standard format binary data through a usb interface, a bluetooth or wifi ad hoc.