I am building an AC dimmer circuit to control from an arduinoArduino using this schematic: Schematic http://2.bp.blogspot.com/-agatDZl3KrI/UU_xXvXY38I/AAAAAAAAIwE/LtmKVLFsA-E/s1600/ac_dimmer_schematic.png
I need to make this dimmer so that it can be used as a three way switch as well. How would I modify this circuit to work in place of a three way switch?