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-Development-Board-Module-For-Arduino-/162247218933> The trick is to push as much processing as you can outward. On Sat, Oct 27, 2018 at 3:27 PM Gene Heskett <[email protected]> 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 > > <[email protected]> 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. > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > -- > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
