On Sun, 28 Apr 2013, Dave wrote:
Date: Sun, 28 Apr 2013 21:23:24 -0400
From: Dave <e...@dc9.tzo.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] [utf-8] Beaglebone LinuxCNC starterkit: ready-to-run
SD card image
I disagree.
If you want a killer product for the BeagleBone Black, you need to toss
the EPP port concept entirely and have the BeagleBone Plug into the
Breakout board - similar to a cape. But make it larger and put 24 volt
DC I/O on it, along with analog I/O, Encoder ins, and step and direction
I/O. To me that would be an attractive package. I really dislike
5volt I/O for field I/O. 24 volt DC I/O is much more reliable and is
the current industry standard. You could have two versions - one for
step and direction and another for Analog servo, but I think I would
design one board.
The only reason anyone ever used the EPP LPT port was because it was
cheap and already part of the PC.
I have no desire to reuse old BOBs and keep it "PC compatible".
Dave
We are considering a Beaglebone step/dir daughtercard. It also looks like the
PRU and a UARTs could run the sserial host side interface (though at a
different baud rate and awkwardly due the the really stupid and ancient UARTS
the Sitara uses)
I dont think the case for servo systems is very good without some additional
hardware. The BBB has just three possible hardware encoder counters. Software
encoder counters could be done by the PRU but they would not be comparable to
hardware encoder counters in performance (hardware can do MHz count rates and
more importantly multi MHZ oversampling for digital filtering). Also you lose
one hardware encoder if you use the on card flash memory and one more if you
use video.
On 4/28/2013 8:57 PM, dave wrote:
Considering the fact that good BOB's cost pretty much what the B3 does
being able to plug to current BOB's would be nice.
Dave
On Sun, 2013-04-28 at 14:55 -0700, Greg Bernard wrote:
I'm with Gene on this. For the short term, at least, a parallel port
adapter (or 2) would allow existing BOB's to be used. But the ideal would be a
dedicated cape that could provide the functionality of a Mesa or Pico Systems
board.
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________________________________
From: Gene Heskett<ghesk...@wdtv.com>
To: emc-users@lists.sourceforge.net
Sent: Sunday, April 28, 2013 4:40 PM
Subject: Re: [Emc-users] ??Beaglebone LinuxCNC starterkit: ready-to-run SD
card image
On Sunday 28 April 2013 17:29:54 Jon Elson did opine:
Eric Keller wrote:
On Sun, Apr 28, 2013 at 1:55 PM, Jon Elson<el...@pico-systems.com>
wrote:
Is there a consensus about BeagleBone vs. Raspberry Pi?
I think it's a no-brainer myself. I have a Raspi, but I just don't
see it competing with the bbb
OK, this was my take on the hardware, but there was so much RPi
discussion here, I thought that might be the way development was headed.
I support the Beagle direction, too, and hope much of what I have
learned on the original Beagle will port over to the Bone.
So, if I were going to make something for the Bone, should it be
like a PC parallel port, or some other kind of breakout board?
I'd like to make something that allows my parport-connected
devices to be used with the Bone, but maybe others would
rather have a much "wider" I/O device, maybe a couple
dozen inputs and outputs from the PRU-accessible pins.
So, any thoughts would be welcome.
Jon
Not that I have a dog in this fight Jon, I don't expect to have to replace
these atom's I bought anytime soon, but it seems to me it should allow the
more or less std 26 pin IDC connector to be used so it could plug straight
into our existing BOB's. Here of course I am assuming the .hal file could
put the right signals on the right pins. That generally is up to us
anyway.
Perhaps 2 of the connectors on yours, for those with more I/O needs than
one EPP port can supply. But I haven't studied it well enough to know if
the PRU has enough I/O to fill up the 2nd connector. That would be pure
icing on the cake IMO if it did.
Cheers, Gene
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