ComputerVoltageSources

Dave,

Thanks for providing the master/slave apps to try - I will get to them
this week!  

gary


"djbrow54" <davebr@...> wrote:
>
> I played a bit today with my two modules to sync together the maf-lfo.
> bas program.  I can't use P6 or P7 to sync since I dedicated those to 
> i2c so I used aux instead.  I commented out the aux lines in the 
> program and created a master and slave version.  It would be simple 
> enough to modify the program to use P6 or P7 to synchronize the 
> modules.
> 
> The slave version looks for both edges of aux for the pause function.
> 
> The master version sets aux high for the duration of the pause.
> 
> It seemed to work pretty good although I didn't put the time into it 
> to consider if it would function correctly in extreme tolerance 
> cases. It cerainly works good enough to validate the master / slave 
> arrangement. I frequency modulate the master PSIM and they are 
> locked together now after about 30 minutes.
> 
> Photo and programs in the
> Files > BasicAtomPro > Original PSIM > Dave Brown
> folder. 
> 
> Scope capture is synced mal-lfo2.jpg
>   yellow is aux sync
>   magenta and cyan are out1 of my two modules
> 
> Master program which drives aux is maf-lfo2-master.bas
> Slave program which listens to aux is maf-lfo2-slave.bas
> 
> Dave
> 
> 
> --- In ComputerVoltageSources@yahoogroups.com, "Gary Chang" <gchang@
> ..> wrote:
> >
> > Being one of very few that has more than one of the PSIM-1 module, I
> > did a little test to evaluate the relative timing accuracy of the
> > PSIM'S internal clock, by loading the maf-lfo2.bas application into
> > each of three modules and starting them with a common start pulse.
> > 
> > The test results can be heard in an mp3 called PSIM mayhem, found in
> > the files folder of this group.
> > 
> > So - it looks as if we are going to need an external sync reference 
> to
> > get these guys to be time reliable.  Probably a simple pilot tone
> > (such as a vco) would be the easiest to reference....
> > 
> > GC
> >
>