I mentioned I’d been looking into AC light dimming. Here’s a Velleman kit that offers DC voltage-controlled dimming. The input is 0-10V, so I’d have to rig up an op-amp to drive it from a microcontroller, but that shouldn’t be too hard. One feature I very particularly like is the inclusion of an opto-isolator, so there is no direct electrical connection between the controller and the AC line power.
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