Now I have to add this switch on top of the material (if material thickness is increased, the switch is on a higher position). It´s a normally open one with a long pcs of metal (to have a long "spring"-way after 1st contact). Why you need to invert the pin, because of an nc-used switch? I can´t answer your question about the capacitor, because I don´t use any.īut I think you need to insert it in paralell to the switch. Just run gcode ripper on one of your gcode files and look at its output, you will see the sequence of operations.
Grbl doesn't do variables (yet/never?) so you would need to write some sort of preprocessor to handle the operation based on the gcode that GcodeRipper outputs.
If using Mach3 or LinuxCNC, then this would work directly. (this is what comes back from Grbl when the probe switches to ground) Grbl will report the machine position of the probe touch. The G38 will move to X and Y, then Z axis will lower to -100 until the probe makes contact with your object, at which time movement stops. A typical porbe command might be G38.2 X20 Y15 Z-100 (in mm mode). The probe position is relative to machine 0. So the probe is anything that will take pin A5 to ground when it touches your object. Some sort of spring arrangement would do. Whatever probe you design should be able to handle some over travel, the Z movement likely won't stop immediately. Grbl will report the probe position back to the user when the probing cycle detects a pin state change. A simple probe switch must be connected to the Uno analog pin 5 (normally-open to ground). The G38.2 straight probe and G43.1/49 tool offset g-code commands are now supported.
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