On 05/03/2017 11:36 PM, Gene Heskett wrote: > On Wednesday 03 May 2017 23:44:02 Jon Elson wrote: > >> On 05/03/2017 09:28 PM, Gene Heskett wrote: >>> The killer in the beaglebone soup is the cost of the "capes". You've >>> over $200 plus psu's etc before it can turn 2 motors at the same >>> time. >> Umm, the CRAMPS board is $79.95, and I sell the 8825 drivers >> for $5 each, but I get them from China for about $1.30 >> each. > The 8825 does what? I need to take another look at your site I guess. 2 A 35 V stepper driver. >> The BeagleBone is $55, > And how many cores & how fast is its arm? I think it is only one core, 1 GHz. Works fine for Machinekit/LinuxCNC control of Cartesian machine, but ssh -X connection from a machine with a screen is noticeably slower than an X86 PC with directly-connected screen.
The Beagle Bone has 2 PRU processors (200 MHz real time 32-bit CPUs) that Charles Steinkuehler set up the framework for so that LinuxCNC can do fast stepping, PWM and encoder counting. Not quite FPGA performance, but WAY faster than software stepping. So, that relieves the ARM CPU from the base thread tasks. Jon ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
