- I have a spare out on the dim controller - if I dim to 70 or 90% then I could feed my Arduino with a steady 7 or 9v (good or bad idea?)
- I think I need to connect to ground of the dimcontroller anyway if I want to measure the voltages on the controller (all grounds need to be connected?)
- I don't want to consume more energy measuring the dim controller output than the lamps consume (nor do I want to set my house on fire) so what are sensible resistor values for the voltage divider and which wattage should they be?
Also - if this is a stupid idea I can accept that - I've always found the programming side of the Arduino easier to understand than the real world electronics.
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