You got me Jeff! I have one 74LVC245 pulled out and was ready to prototype and was about to order a few 74HCT245's to try and have on hand. I checked the pinout and it looks perfect!
I'm looking forward to trying it out. Doug On Monday, July 1, 2019 at 9:15:57 AM UTC-7, Jeff Pollard wrote: > > > Hi, > > I have an a simple interface board that outputs signals on a DB25 > connector that plugs in to the BBB header. > They are buffered by LVC series chips and work well for driving optos > such as 6N137. > If interested, you can get more info here: > > > http://xylotex.netfirms.com/OSCommerce/catalog/product_info.php?products_id=146 > > Jeff > > On Sunday, June 30, 2019 at 10:38:18 AM UTC-7, Doug LaRue wrote: >> >> I have a 3040T 4 axis CNC and currently have grbl on an Arduino Nano >> connected to the DB25. >> >> I was wondering if anyone has tried Machinekit on a CRAMPS board driving >> the DB25 directly instead of going inside the control box and replacing >> things. The DB25 has opto isolators on the DB25 inputs. >> Probably more of a question for Charles unless someone else is familiar >> with the drive capabilities of the BBB and input bufffering of CRAMPS. >> >> They are 4N26 - http://www.vishay.com/docs/83725/4n25.pdf >> >> DB25P wirings: >> From Vide CNC LPT Pinout >> db25 Pin Description >> 1 A Enable >> 2 X Step >> 3 X Direction >> 4 Y Step >> 5 Y Direction >> 6 Z Step >> 7 Z Direction >> 8 A Step ** >> 9 A Direction ** >> 10 Reset / Abort / E-Stop >> 11 Z limit( Mach 3 video =X) >> 12 Y limit( Mach 3 video =Y) >> 13 X limit( Mach 3 video =Z) >> 14 X Enable >> 15 Probe >> 16 Y Enable( Mach 3 vidoe =Output1) >> 17 Z Enable >> 18 - 25 Ground >> >> >> >> [image: GRBL_Arduino_Nano_DB25_CNC_1.jpg] >> >> -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/machinekit/8ae59bea-e12e-4a04-a0b3-54492ad6ac41%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
