On Fri, 3 Jan 2014, Gene Heskett wrote: > Date: Fri, 3 Jan 2014 17:53:11 -0500 > From: Gene Heskett <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: [email protected] > Subject: Re: [Emc-users] Spindle control on BBB > > On Friday 03 January 2014 17:49:56 andy pugh did opine: > >> On 3 January 2014 22:09, Kirk Wallace <[email protected]> > wrote: >>> VFDs are often controlled with a PWM signal going to an opto-coupler. >>> An example is here: >>> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?VFD_Digital/Analog_Interface >> >> I have just found out that Mesa have a ready-made widget for the job: >> http://store.mesanet.com/index.php?route=product/product&filter_name=spi >> n&product_id=205 > > That looks like a ready-made recipe for happiness. How long has that been > in your "bag of tricks" Peter? I'd be willing to bet it would kick ass on > Leonardo's C41 I've had to cuss and cobble, screwing with mods to mods to > get it to work. > > > Cheers, Gene > -- > "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> > > It gets late early out there. > -- Yogi Berra > A pen in the hand of this president is far more > dangerous than 200 million guns in the hands of > law-abiding citizens.
We have used the same circuit for a number or years (in cards like the 7I47S). But note that you cannot directly compare this to the C41. We have a much easier task since the PWM is assumed to come from a FPGA card where we have a minimum 100 MHz PWM clock so we use 12 bit PWM at 5KHz. This is trivial to filter without adding a significant lag to the spindle control, not so with bit banged PWM... > > ------------------------------------------------------------------------------ > Rapidly troubleshoot problems before they affect your business. Most IT > organizations don't have a clear picture of how application performance > affects their revenue. With AppDynamics, you get 100% visibility into your > Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
