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WiFi smart relay controller for control of HIGH power load up to 40A 9.6kWt 240VAC or 30VDC:
If you're looking to build a network-connected device with Arduino Nano is the best solution for you!
The optical endstop is the best solution for any type of 3D printers and other CNC or 3D tools.
Relay Shield for Arduino Uno, 4 relays