Comments on RepRap: Blog: Digital servo

Um... actually, I am looking to use one PIC to dri...

2006-05-27T06:14:24.616+01:00

Um... actually, I am looking to use one PIC to drive each motor/encoder ensemble and then use a pic to manage the two of those that power one axis.

Godzilla's z-axis (horizontal) and y-axis (vertical) use two motors while its x-axis uses one. The pic that manages the two PIC/motor/encoders that drive one axis would be hooked to the token ring.

I suspect that keeping two motors moving at very much the same speed and clicking through the same positional milestones within spec is going to be a bit trickier than a serial loop will allow for. Could be wrong, mind. :-)

We've allowed for a sync line to make life easier....

2006-05-27T04:24:21.730+01:00

We've allowed for a sync line to make life easier.

Vik :v)

Yes - I seem to remember we had a debate about thi...

2006-05-26T20:43:55.630+01:00

Yes - I seem to remember we had a debate about this a while ago: whether to drive all three axes with one PIC, or to have one PIC per axis. But I also seem to remember Simon got the latter working with steppers nicely at 19200 baud, so there's no reason in principle why one couldn't do the same with this servo.

Looks like running two of these in tandem is going...

2006-05-26T18:19:30.826+01:00

Looks like running two of these in tandem is going to be tricky! :-)

I'm beginning to think that using a PIC to control two of these via one of the ports rather than the serial loop is going to be the way to go.

Wow! You timed that perfectly! My DC motors and ...

2006-05-26T16:19:24.633+01:00

Wow! You timed that perfectly! My DC motors and encoders both are due to arrive today! :-D