Question was related to wiring schema I plan to use - picture available on
more precisely about how to connect transfer signal from torch to cramps
1) CPC_14 and CPC_12 are dry relay contact in hypertherm plasma that are
contacted when CNC needs to do "motion"
2) I plan to use P503_3 pin on cramps
3) first I thought I need to use 5V connected on CPC_14 but then I
noticed P503_3 is pulled up to 5V
4) this mad me think oh P503_3 is already on 5V so it will make no
difference if 5V will be brought and PIN will not be altered in this case
5) I decided to use GND connected on CPC_14 (I corrected schema in upper
This might not work. These pins are protected against 5V levels, but
only have the drive capability of the BBB I/O pin (which is 3.3V and a
few mA). If this is not a high-speed signal, I would suggest using one
of the low-power FET outputs. These are "open-drain" style outputs and
can handle voltages up to 12V.
I use 3.3V relay and I think it has some FET embedded on it. Something like:
So I cross my fingers that BBB with few mA driving capability would be able
to run it.
Dne petek, 07. oktober 2016 18.42.36 UTC+2 je oseba Charles Steinkuehler
> On 10/7/2016 3:45 AM, Klemen Živkovič wrote:
> > Oh I see on cramps schematics (
> > http://reprap.org/wiki/File:CRAMPS.v2.1.sch.pdf) that P503 signals are
> > pulled up to 5V so for transfer it would be better to use GND instead
> > CRAMPS_5V.
> Sorry, I don't really understand the question.
> Charles Steinkuehler
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