Question was related to wiring schema I plan to use - picture available on this link: "https://raw.githubusercontent.com/zhivko/PipeCutter/master/screenshots/PLASMA_WIREUP.jpg"; more precisely about how to connect transfer signal from torch to cramps hat. 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 link accordingly).
Regarding this: " 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: http://www.ebay.com/itm/DC-3V-3-3V-Relay-High-Level-Driver-Module-optocouple-Relay-Module-for-Arduino-/331502222842?hash=item4d2f127dfa:g:fgYAAOSwX~dWqZEx 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 napisala: > > 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 > all > > 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 > [email protected] <javascript:> > -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. Visit this group at https://groups.google.com/group/machinekit. For more options, visit https://groups.google.com/d/optout.
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