I don't call it a problem. With the three board designs, you can make a replacement for one of the "wings". splitting it up makes the design of each really easy. And as said PCBs this size cost under $1 each even in tiny quantity. So what I see you have here is the start of a family of boards.
My problem with this is that I think the Beagle board is grossly underpowered. It is OK if you are making a battery-powered, portable milling machine but if you have access to AC mains power why use a beagle? On Sat, Dec 12, 2020 at 11:38 PM John Dammeyer <jo...@autoartisans.com> wrote: > The problem with the boards are that they are a little too general > purpose. So much more is needed above and beyond isolated outputs or > inputs. > > For example, say you want RS485 for the spindle controller. Or maybe > CANopen CAN bus for pick and place tools to bring in raw material and > remove finished goods. Even just a tool changer. > > The Beagle has CAN bus and Serial ports along with I2C and SPI. These > should be configured so it's possible add an LCD display with touch > screen. If they make one of the CAN pins a switch input then the CAN port > is lost. That's what happened with the 4D Systems LCD cape I bought (now > discontinued). Useless if I also want a CAN cape. > > A cape meant for CNC should know that LIMIT and ESTOP switches should be > NC type for safety. So no disabling outputs with the ESTOP signal. > > A hardware PWM module on the Beagle should be an output. And ideally, > with a jumper, a PWM to 0-10V output or else STEP with the corresponding > DIRECTION signal. > > Inputs tied to the AB and Index input of one of the quadrature encoder > modules. > > Ultimately what's more cost effective and saleable? A general purpose > board that still needs another BoB or a dedicated interface that would work > with _most_ mills or lathes. > > IMHO the latter. > > John > > > > > > > > -----Original Message----- > > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > Sent: December-12-20 10:37 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Beaglebone and MachineKit > > > > I just looked. That is a really nice way to design this. At first I > > thought "Three boards? Why?" but this gives you some flexibility to > change > > out one board and also you have some packaging options too. > > > > One thing I want to point out is that anyone here could have this PCB > made > > for 40 cents each and have a stack of them in hand before the start of > > 2021. However it might be worth a re-design using surface mount parts > > because JLCPCB now offers to assemble SMT parts at no cost. They would > > solder everything but the connectors and it would cost maybe $1 per PCB > > total. > > > > On Sat, Dec 12, 2020 at 9:44 PM Robert Murphy <robert.mur...@gmx.com> > wrote: > > > > > I used a 3 board solution on my BBB before switching from MK to > Linuxcnc. > > > > > > https://github.com/ozzyrob/pp_cape > > > > > > https://github.com/ozzyrob/pp_bob_input > > > > > > https://github.com/ozzyrob/pp_bob_output > > > > > > > > > The cape attaches as normal and the 2 other boards sit either side > > > connected by a short ribbon cable. > > > > > > Still have a few sets of boards left over, and one set of 3 fully built > > > that I used but no longer have a use for. > > > > > > There are pretty basic but I found them to work without any issues. > > > > > > On 13/12/20 7:18 am, Alan Condit wrote: > > > > Marcus, > > > > > > > > Jon Elson (Pico-systems) sells the Cramps board designed by Charles > > > > Steinkuehler that can run six Pololu stepper drives (like 35v 1 to 2 > > > amps). > > > > I designed a little PCB that can plug into three of the stepper > driver > > > > sockets to allow it to control 3 external drives. They are or were > > > > available on OSHPark as CRAMPS-BOB3-a3. > > > > > > > > Alan > > > > > > > > > > > >> From: marcus.bow...@visible.eclipse.co.uk > > > >> To: EnhancedController <emc-users@lists.sourceforge.net> > > > >> Cc: > > > >> Bcc: > > > >> Date: Sat, 12 Dec 2020 19:38:12 +0000 > > > >> Subject: [Emc-users] Beaglebone and MachineKit > > > >> John (or anyone else), > > > >> > > > >> Is there a 'cape' currently available to suit the Beaglebone Black > > > >> running MachineKit or LinuxCNC? > > > >> I know there used to be a cape specifically for that purpose, but > it has > > > >> been out of production for some time. > > > >> I have a Beaglebone I would like to press into service running > either > > > >> LinuxCNC or MachineKit. > > > >> Are images available for both? > > > >> > > > >> Marcus > > > >> > > > >> > > > > _______________________________________________ > > > > Emc-users mailing list > > > > Emc-users@lists.sourceforge.net > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > -- > > > > Chris Albertson > > Redondo Beach, California > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
