2015-03-21 21:11 GMT+02:00 Dave Cole <linuxcncro...@gmail.com>:
> I'd run the input to a unused Mesa 24 volt input and put some logic into
> Classic Ladder for a couple of timers to condition the input with  time
> on and time off delays so you don't short cycle the grit loader.  Or
> just tie it in via hal if no timers are required.

Yes, I already have it hooked to gpio pin, currently the hopper is
switched on/off by a checkbutton on pyvcp panel.
I thought about using classicladder and few timers there, but the
thing is that this solution is not easy to adjust for operator.
Correct timing pattern is unknown at the moment, and I do not think I
want to provide instructions over the phone on how to use
classicladder, so I thought that 2 spinboxes in vcp panel as a source
for the time (in seconds, number of servo periods or whatever) and few
HAL modules (like oneshot etc) might do the trick, but did not come up
with anything reasonable, so I was hoping for some hints.

Viesturs

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