(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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