Multiway Switching Controller Design using FPGA

Multiway switching has become nowadays quite frequently used in build-ing wiring. It can be defined as an interconnection of two or more electricalswitches in order to control an electrical load from more than one location.Although the electrical load is often a lamp, electrical outlets, fans, pumps,heaters or other appliances, it can also be controlled by multiway switching.However, in this paper we will deal only with lighting systems.Special switches are required to implement the system (three-way andfour-way switches) that have additional contacts, and extra wires must berun between them. In this way the light can be controlled from differentspots, e.g. the top and bottom of stairs or the end of a long hallway.Externally there is a resemblance between these switches and the standardsingle-pole ones. Extra connections make possible the control of a circuit frommultiple locations. By connecting one or more four-way switches in-line, withthree-way switches at either end, the light can be controlled from three ormore locations. Toggling any switch changes the state of the light from offto on, or from on to off.We would like to introduce a solution in this paper, based on FPGA forthe mentioned system and using HDL. The aim is to attain a high level ofgeneralization by applying any (even quite large) number of switches andlights