On 8/5/23 20:47, John Dammeyer wrote:
Three different screens. The Manga screens were for the Replicape which was
a 5 axis stepper driver module for 3D printers. One axis driver failed and
support for the cape vanished. The two manga touch screens never worked
well. I even sent the original back to demonstrate the problem. It was
returned with the comment that nothing was wrong with it. Touch still
didn't work in the corners so like a fool I bought the large Manga 2. It's
really just a converted Cell Phone screen.
And the SD systems small board, although it worked, was also discontinued.
And some of the pins for the button and display made running LinuxCNC
difficult with the cape. And CAN bus was impossible without rewiring the
cape.
The other problem with the BBB is the HDMI interface is for lower res
screens because that was the standard at the time. The 800x480 HDMI is
discontinued.
https://www.adafruit.com/product/2261 Maybe this one would work.
Anyway, the key word is discontinued...discontinued...discontinued.
Modern electronics has a lifetime now often less than the development time
for a solid product. Not like the milling machine you buy and expect to use
for 20 years.
John
After you throw away the junk electronics and rebuild the controller so
it works. When dealing with a 6040, I learned that the school of hard
knocks way. But now I have a decent machine.
-----Original Message-----
From: John Dammeyer [mailto:jo...@autoartisans.com]
Sent: August 5, 2023 3:24 PM
To: 'Enhanced Machine Controller (EMC)'
Subject: Re: [Emc-users] Beaglebone black latency
Me too. A closer look at the fine print and selecting the correct button
shows
the actual CNC controller is $513 or $541 for 3 or 4 axis respectively.
The MPG
is priced separately at $96.
And this is why a BBB with a cape that included a Break Out Board with a
few
relays etc. for under $100 would be quite the bargain. The question is
then
what sort of display would be good. And you still need some sort of MPG
to
go with it for also about $100.
For $94 I can get, from amazon.ca a 7inch HDMI LCD (H) 1024x600 Monitor
IPS Screen Capacitive Touch Display Supports Raspberry Pi Jetson Nano
BeagleBone Black Banana Pi & Microsoft XBOX360, Sony PS4,Nintendo Switch
And therein lies the problem. Creating something similar to the $500
Chinese
CNC controllers with touch screen will ultimately cost in the same $500
range.
But unless the MachineKit or LinuxCNC version is stable with a target life
similar to the life of the machine tool no one will spend the energy and
time
to make that.
The market isn't big enough to justify the work required. Which is why so
many of the Beagle Capes are no longer available. Next week there's an
new
ESP32 with more bells and whistles. Won't do what the Beagle does but ...
John
-----Original Message-----
From: Martin Dobbins [mailto:tu...@hotmail.com]
Sent: August 5, 2023 11:44 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Beaglebone black latency
It makes me wonder which operating system they put on that Chinese
controller, and what motion control system.
Martin
________________________________
From: John Dammeyer
Sent: Friday, August 4, 2023 7:41 PM
To: 'Enhanced Machine Controller (EMC)' <emc-
us...@lists.sourceforge.net>
Subject: Re: [Emc-users] Beaglebone black latency
My biggest issue with the Xylotex BBB Cape for CNC was that the logic
for
ESTOP was inverted. ESTOP was a N/O switch so if a wire was broken you
wouldn't find out until you tried to save a body part from being injured
with
the ESTOP.
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Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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