Contact!

I've got the GRBL touch probe working. On a RAMPS board I just used the T2 thermistor input as the touch probe (default config on the Mega firmware). Ground contact for the probe is supplied by a piece of copper wire that has been curled to give it a bit of spring. I've wedged a header pin onto the probe and soldered another onto the ground contact so I can take stuff on and off easily. Not able to play with chemicals to make more conductive glass yet, so I have put a New Zealand 10c piece on it and I'm testing the probe on that. This is being done with the stock CNCjs app's probe function.  I just copy the Z touch data out of its serial console - quick hack or wot?

 

Mapping the data with LibreOffice wasn't possible - apparently 3D Graph means something with 3D eye candy in officespeak. This has meant learning gnuplot, which takes a bit of wrapping your head around but gets there in the end and produces proper 3D maps in perspective. You'll see some later, but a 15x15 grid with 0.1mm divisions takes about an hour to probe ...