On Saturday 27 October 2018 18:52:37 Chris Albertson wrote: > Some day I'll have to connect my favorite development board to EMC. > That way every time someone suggests something I can ask "Is it > already built? Can it step a motor at 100K per second, can it read > quadrature encoders at the MHz range and get you get it for under > $2.50 with shipping included?" > > It is basically a nearly bare STM32 chip. These have, of course the > 32-bit uP but also a pile of on-i peripheral hardware like > (1) hardware quadrature decoder (no code needed, it's hardware) > (2) programmable pulse generators (again no code to generate pulses, > it's done in hardware > (3) SPI, i2C, USB and Serial interfaces > (4) analog input and output > > You don't have to build it. and they will ship you 10 of them for > $22.50. ebay.com/itm/STM32F103C8T6 > <https://www.ebay.com/itm/STM32F103C8T6-ARM-STM32-Minimum-System-Devel >opment-Board-Module-For-Arduino-/162247218933> > > The trick is to push as much processing as you can outward.
I'm not allergic to that, other than the learning how to do it time > > On Sat, Oct 27, 2018 at 3:27 PM Gene Heskett <ghesk...@shentel.net> wrote: > > On Saturday 27 October 2018 17:30:42 Gregg Eshelman via Emc-users wrote: > > > PCIe to SPi 'demo board'. > > > https://www.asix.com.tw/products.php?op=pItemdetail&PItemID=256;74 > > >;110 Docs and drivers at the bottom of the page > > > > > > On Saturday, October 27, 2018, 1:43:43 AM MDT, Gene Heskett > > > <ghesk...@shentel.net> wrote: > > > > > > The spi port on the pi is faster, but I've not found an spi card > > > for x86 machinery yet. > > > > But you have to add the latency of the ethernet connection, adding > > 10 to 50 u-secs of random lag. That cannot be tolerated by a stepper > > motor if any speed is expected. And if the computer is good, the > > stock parport can step a motor directly. You can tolerate more lag, > > but that translates directly to how fast the motor can be driven > > without any stalling. Eventually you're down to about 8" a minute, > > and thats comparable to watching paint dry or grass grow. Just right > > perhaps for precise EDM work which I have done on that slow machine. Thanks Chris. -- 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) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
