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Is there any example of a TRAIC (or other) hardware solution for Z-UNO, both in Hardware and Sketch?

I have a application where I need to control the Line Voltage 240VAC to 0-240VAC.

Anyone?
or is there no support for incandescent dimming?

You need to use standard TRIAC modules like with Arduino. we have such h a module

In brief you should trap zero cross interrupt, wait a bit depending on the dim level, turn on the TRIAC control PIN and the turn it off