I am about to update my ceiling fans. and the switches control both the light and the van. Do they make a switch that will run of one wire to control both the fan and the light separately? I happened to see a switch that at lowes controls both the fan and light that are adjustable. (the lights dim and it controls the fan speed.) but im not sure if it works off one wire or would i have to just deal with the turning the light on and off by the pull cord from the fan. I am just comfused about the switch set up. I know in like electronic devices you can use one wire and a dual switch to control 2 different things... please help.