ComputerVoltageSources

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
>