Just tried the script on my machine and it works OK here.
The Z only moves up 1" after it has touched the plate. Silly question but have you got your Z axis reversed ? ( +Z should be upwards movement)

Tweakie.

No,  the Z is correct.  I am wondering if I need to bring the pin up to 5v with the resistor trick.  I can get it to so the Z moves down when I run the script but I have to set the pin to emulated.  When I do that I get no response from contacting the plate to the alligator clip.  If I turn off emulate the digitizer light in diagnostics is lit and contacting the plate and clip cause it to go off.

The probe input should be configured active low and the digitize LED should be off until the tool contacts the plate.
Could it be that your BoB is holding the input low and causing the digitize led to be on ?

Tweakie.

I think that is the issue.  I was looking into bringing it high with a resistor.  Can I check the screw terminals on my BOB for an available 5v to attach the resistor to with my multimeter? I am a little worried about checking them willy nilly.
Will I have to enable the pin I select in outputs to find 5v ?
I hate having to ask these stupid newbie questions, thanks for your patience.

They are not stupid questions - don't forget I was in exactly the same position as you, a year ago perhaps (I couldn't get it to work first time either  )


I assume you are using an active BoB which is powered 5 Volts so take the +5V from there.
I would try a resistor about 10,000 ohms (10K) to see if that pulls the input up to 5Volts - if that doesn't do it then we will have to think again.

Do you have any details on your BoB make, model etc. ?

Tweakie.

I use a 10K pullup with my auto zero and Xylotex.

Which pin did you connect the 10k to?

I'll be home in about 90 minutes and I'll let you know.

Pin 15