What does a Micro Switch Do?

I have just baught a computer case and it have a Micro Switch at each side of the doors and when you open the door it click and when you close the door it click, so my question is what does this do when you open and close the door, I have connected it to anything yet because I dont know what it does.
Thanks

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I don't know where you are in the build process nor where you got your parts. If you purchased your SKR Pro board from Ryan, then you will have a correct firmware on the board. If you purchased your the dual ends stop wires at the same time, then you will have the correct firmware. There are two configuration for the MPCNC serial and dual end stop. Ryan flashes what he thinks you will need based on the parts you purchased. If you are unsure, you should be able to look at your display when booting the control board and see the version. The dual end stop version will have a 'D' after the firmware version number. If you don't have a display installed, I believe sending a M115 will give you the info.

If you did not buy your board from Ryan, but did purchase all the specified other hardware, then you will need to 1) download the appropriate version of the firmware from V1, 2) potentially make some changes to support the drivers you purchased (if they are different than the ones Ryan sells), and 3) flash the firmware. This is the release point for V1 firmware. All the parameters in the firmware that V1 provides is setup to the hardware he specifies for the MPCNC.

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If you purchased alternate hardware like a pully with a different number of teeth, or lead screw with few or more mm per revolution, you would need to modify a few parameters in the firmware. These modifications can be done directly in the firmware or done after you your rig is running through g-code. Based on the information on this form, needing to make this kind of change is exceeding rare.

As for testing the end stop logic before you've installed the end stops, as mentioned above, the dual end stop firmware expects the connection to be normally closed. So if you have some Dupont cables, you could jumper between the signal pin and ground for all your end stop connections. Then start your homing sequence. Pulling the jumper off will stop that stepper. If you are having trouble, an M119 g-code can give you the states of all the end stop switches.

Edit: Also if you are having to modify firmware anyway, consider modifying the following section in your configuration.h to match the size (in mm) of your XY working area.

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