2 – Control Module Design
Connection of limit switches
For each of the 3 axes there are connections for two limit switches on the control module.
The connections of the limit switches of one axis are connected parallel to each other. The
direction of movement enables the control module to differentiate which limit switch was
triggered.
Activate homing using limit switches
In order for the control board to evaluate the limit switches in the context of a homing run, this must first be switched on
in the control module. Homing is controlled by Grbl parameter $22. If limit switches are used, enter "$22=1" in the Grbl
or LaserGrbl command line to activate them and "$22=0" to deactivate them. A homing run can then be triggered by
entering "$H".
Connecting a Z-Probe (measuring tool)
To automatically determine the distance between the tip of the milling cutter and the
surface of the workpiece to be milled, an additional measuring tool, a so-called Z-probe,
can be used. This is connected to terminal A5 of the 16-pin connector and the opposite
GND terminal.
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