On Mon, 2012-12-03 at 10:04 -0600, Jason Burton wrote: > On Dec 3, 2012 9:40 AM, "andy pugh" <bodge...@gmail.com> wrote: > > > > On 3 December 2012 15:15, Jason Burton <lathebuil...@gmail.com> 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
