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fellesverkstedet / fabricatable-machines

Motion systems for flexible digital fabrication and research. Easy to fabricate and customize. Documentation: https://github.com/fellesverkstedet/fabricatable-machines/wiki
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PCB patch Outline Does not work correctly. #18

Closed theholyduck closed 5 years ago

theholyduck commented 5 years ago

As per or previous conversations i decided to try the patch suggested in https://github.com/fellesverkstedet/fabricatable-machines/blob/master/humphrey-large-format-cnc/humphrey_v3/img/electronics/possibel_upgrade.JPG

Everything still seems to work but there is no power-out detection at all. Since the drawing there is of a slightly different revision of the pcb than the one we actually have. i have included this drawing of where i cut and where i patched. image

theholyduck commented 5 years ago

actually i did just find something that is affected by that patch. with that patch enabled i cant fire up the spindle at all. with it disabled. i can

theholyduck commented 5 years ago

i guess this patch isnt strictly speaking necesary. the arduino in the original config does seem to pretty reliably detect a power-cut.

Jaknil commented 5 years ago

Great that you gave it a go! I think I have spotted the error in the fix and will add that to the next generation of the card. If the original config works for you then I suggest that is kept.

Jaknil commented 5 years ago

I have found why it didn't work. It was two things, the signal was not inverting correctly with that setup and I had mixed up the GND (for arduino) with GNDS for the regulator. I have updated the schematic and board accordingly. (HRBL-nano).

Since your machine is already correctly throwing an error message when external power is cycled I suggest that you leave it as it is.

This is the tested and working schematic to constantly send an ABORT on loss of exernal power: image