On 11/08/2011 8:30 AM, Dave wrote: > On 11/8/2011 6:56 AM, andy pugh wrote: > >> On 8 November 2011 11:16, James Louis<[email protected]> wrote: >> >> >>> Good morning all, >>> There is an ad running in Digital Machinist magazine for an RC speed >>> control of a brushless motor with ESC. If interested go to www.logicnc.com >>> It gives EMC2 a way to control spindle speed from the parallel port. I >>> haven't used one yet though. >>> >>> >> It isn't strictly necessary. As the RC pulse protocol is a 1 - 2mS >> pulse every 20mS the standard EMC2 PWM function can be used, but gives >> fairly poor resolution. (20 discrete steps with a 25,000nS base >> thread). >> >> >> > 1-2 ms in 20ms ... I've read that before. So the min pulse width is > 1 ms and the max is 2ms.. in a 20ms time slot? > > Seems like a waste to only use up to 2ms of the 20 ms time slot... > > No, RC is a pulse POSITION modulation, see <http://skymixer.engineering.free.fr/index.php?option=com_content&view=article&id=74:rc-ppm-signal&catid=51:rc-receivers&Itemid=49> for more info. (Line may have to be unwrapped.)
Jon ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
