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WiFi smart relay controller for control of HIGH power load up to 40A 9.6kWt 240VAC or 30VDC:
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
Relay Shield for Arduino Uno, 4 relays