Most of my lighting projects involve low-voltage LEDs and lasers, but every now and then it’s nice to be able to control AC devices at line voltage. Here is a thorough explanation of light dimmer circuits, with schematics. Looks like the right solution for µC control might be a power MOSFET and a zero-crossing interrupt: the µC can turn power on at the zero crossing, set a timer, then turn power off any time in the next 8 milliseconds, depending on desired brightness level.
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