The charge pump signal is a great idea! Thank you for pointing that out. N. Christopher Perry
On Dec 3, 2012, at 11:49, Kirk Wallace <[email protected]> wrote: > On Mon, 2012-12-03 at 10:04 -0600, Jason Burton wrote: >> On Dec 3, 2012 9:40 AM, "andy pugh" <[email protected]> wrote: >>> >>> On 3 December 2012 15:15, Jason Burton <[email protected]> wrote: >>>> How about a capacitor based delay circuit? >>>> >>>> AND-gate it with your one shot pin. >>> >>> That sounds a little over-complex. >>> It is probably simpler to find a better-behaved parallel port pin. >>> They will tend to change state on power-up. Some are hardware >>> inverted. Choosing to use (or avoid) the hardware-inverted ones might >>> be the solution. > > I believe the charge pump signal is normally used to block parallel port > signals until LinuxCNC is up and running. > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?About_Charge_Pumps > > One possible detector is this: > https://www.sparkfun.com/products/9147 > > Or, there are break-out-boards with pump inputs. > > Another option is to use a hardware signal generator, such as from Pico > or Mesa instead of the parallel port directly. > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/index.html > California, USA > > > ------------------------------------------------------------------------------ > Keep yourself connected to Go Parallel: > BUILD Helping you discover the best ways to construct your parallel projects. > http://goparallel.sourceforge.net > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
