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This module is the same, that the Thyristor AC switch.
This is the good old AC Dimmer, but with 2 channels.
The optical endstop is the best solution for any type of 3D printers and other CNC or 3D tools.
This simple set for 3D printer base on microcontroller Mega 2560 + RAMPS 1.4 + motor drivers, it is a solution for
If you need to control the AC power (lights, home equipment’s), a thyristor can help you with that.