On Wed, 19 Apr 2017 at 04:09 [email protected] < [email protected]> wrote:
> > USB does not work, there is no certainty as to poll interval, there are > repeated in depth explanations of this on the Linuxcnc forum if you are > interested > Yups. Note thought that the USB module is not a USB/Parallel converter, it contains a microcontroller that takes over the pulse generation and has local buffering. There's a Mach3 plugin that hooks in there to offload the work, somehow. Probing for home/limit switches and such I could see suffering, though. > Why do you want to use a BBB? > >From what I understand, LinuxCNC can use the PRU hardware on the BBB to generate the pulse trains,which sounds like a cheap and painless way to get timing accuracy. Aside from that, it's small and fanless. > All you need is a small form factor ex corporate x86 desktop with a > parport, available for £30 on ebay. > You can run the whole machine from one parport, if you chain the limits to > one pin > (which limit tripped will be obvious from the table position, so you don't > need to waste 3 pins on them) > Or fit a £10 PCI parport card and have loads of extra IO. > > If I never see another beige box x86 PC, it'll be too soon :). From what I understand, you also want a fairly dated computer, that doesn't have IMT, turn down APM and whatnot to get decent timing accuracy. I'm no expert, and I'm hoping not to become one. > The downside with BBB or DE0-NANO is you still require another computer to > access the board and provide graphics. > The BBB has HDMI out and a USB port. I'm pretty sure I've seen monitors & keyboards hooked up to them with LinuxCNC/Machinekit running on them? Looks like perhaps the Xylotex BBB_IDC26_26 <http://xylotex.netfirms.com/OSCommerce/catalog/product_info.php?products_id=117&osCsid=02d8976524cba9afc29279c2026395ad> would do for me, though I'd need to break the second IDC26 connector out to something more comfortable? -- 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.
