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GRBL Library To Arduino IDE with Windows 10

These are the end stops. So each end stop gets Connected to the corresponding axis, ie. -X to pins on -X and +X to + X pins. Black wire to black pin and red to white pin?

No. Green wire to white pin and black wire to black pin. Don’t connect Red. Those switches are meant, I believe, for a RAMPS board (3D printing). The circuit looks like it would have an LED light up if the red wire is connected to 5v. It also provides an external pullup resistor. Basically the Red wire is unnecessary. I’d leave it disconnected.

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