I've good experience with Arduino, but always with digital electronics and low-power loads. I'd like to automate my ceiling fan using an IR remote control but I've no experience with controlling AC other than using a simple relay to switch things. The arduino/IR part is clear.
I've a ceiling fan with a rotating knob controller. Without the cover it looks like this:
How should I control it? I don't mind having only one speed so the quick solution is using a relay. Is there anythink like a "digitally controlled rotary knob" so I can also choose speed? As far as I understand this should be nothing else than a variable resistor, but I do not know anything about controlling AC loads.