Sparkfun Shapeoko 3 Probe


Just bought a second hand machine and a newbie. Would like to add probing.
Looking at the Stepoko hookup guide, it shows connections.
Stepoko board
I assume that I just connect to those and it does not matter which.

Second question is that the notes say.
Probe Detect material
Breakout pins
Screw terminals
Normally open, connected to terminals.
Drive high for active on pin headers - remove U6 for use
Any idea what is meant by U6?

Many thanks for any assistance.

Best wishes.


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