The Shop > Electronics & IC Programing
Raspberry Pi, Arduino, Shield, GRBL, CNC, etc.
vtsteam:
Thanks Gerrit! :beer:
I think I'll send for a Uno board then.
gerritv:
BTW to address the real/valid concern about using an SD card as a hard drive, this is useful to know:(from the Raspberry Pi web site)
All the files necessary for booting are installed in a FAT32 partition of the SD card. The Raspberry Pi has to have an SD card installed to boot from, but a USB HD can “take over” after the initial boot. You cannot boot without an SD card.
Gerrit
vtsteam:
Thanks Gerri, again :beer: (I did get that bit from DMIOM earlier, as well).
So, for booting, seems like just a small, high quality SD card would do the trick. Writes would therfore be few and far between except for boot option changes. And reads are limited, assuming control is transferred to USB drive immediately.
(btw, I think the Atmel processor also has 32K internal flash memory that is read to boot the Arduino board.)
For me 100 jobs a year would be an extremely optimistic estimate of use. So I think the reliability risks are trivial.
Even then, there's a failsafe feature of sorts with the RPi SD card in this application. If the boot card ever failed, you wouldn't succeed in booting to the USB drive anyway. So you wouldn't be able to do any CNC milling at all. In that case, You would just replace the card for a few bucks.
vtsteam:
Another thought -- In my tiny shop, it would be great to get away from the need for a keyboard and mouse and monitor (or even a laptop in a 6' x 8' shop).
An ideal (at least in size and portability) would be something like an Android tablet for feedback and control similar to Urly's Bluetooth DRO project that Modeldozer is writing about in his thread.
I happen to have an 8" Acer A1-830 (Atom x86 proc) that would be great to be able to use. That would be pretty close to a CNC pendant in utility. Though maybe a Bluetooth connection wouldn't be feasible for reliability. Don't know.
Still, a USB cable wouldn't be any worse than a pendant requires, and simple to connect.
Maybe just a pipe dream :scratch:
gerritv:
Just use the Android to Remote Desktop into the RasPi? http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=65264
Lots of cheap tablets around in the post-Christmas sales.
Gerrit
--- Quote ---Another thought -- In my tiny shop, it would be great to get away from the need for a keyboard and mouse and monitor (or even a laptop in a 6' x 8' shop).
An ideal (at least in size and portability) would be something like an Android tablet for feedback and control similar to Urly's Bluetooth DRO project that Modeldozer is writing about in his thread.
--- End quote ---
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