On Thursday 27 November 2008, Kirk Wallace wrote:
>On Thu, 2008-11-27 at 11:09 -0500, Gene Heskett wrote:
>... snip
>
>> Somewhere in that controller there should be the equ of a turn left or
>> turn right switch. That is where I'd hit it with a pair of reed relays
>> driven by the pc. The older version had them obvious, right in the dial
>> you turned.
>
>I'll take a look.
>
>> If it can make a full turn in 20 seconds, that's about 10x faster than
>> mine, which is the old drive two motors design. The image would go flying
>> by so fast there would be lag blur in most of the ccd sensors.
>
>I'm pretty sure mine are the same as yours. I just needed a number to
>indicate that the length of time of the rotate command could be a valid
>means of setting an adequate position. My weather-cam setup takes a
>snapshot at Home, then rotates and stops at position two, takes a
>snapshot, rotates, etc. Finally, it does a longer than needed return, to
>reset Home.
>
>> Emc could I'm sure count the power pulses going out to the top motor,
>> using a neon lamp and a photo transistor, you would have either 120 or 100
>> pulses per second to count depending on where you lived and its power
>> standard. To use, put the neon lamp across the primary & keep track of
>> which direction in emc. Don't forget the series r for the lamp though.
>
>This is why I go off topic occasionally, I get replies with all these
>good ideas. Thanks.
>
I don't know as I would call this "off-topic" all that much, it after all is
all about getting the job done with emc. And I'm sure it can do it.
>> Or another idea, use optocouplers, one across each motor winding and emc
>> can decode those just as if it were following any quadrature encoded
>> signal because there will be a timing difference in the two optocouplers
>> outputs depending on which direction the motor is being driven. I rather
>> like that and it only takes 5 wires including ground to do. That hal
>> component may already be part of the recent emc package.
>
>I'd also like to use HAL to control a generator, but I need a setup that
>would boot within a minute of a power outage, start the generator,
>control and monitor; the generator, mains, controller and starting
>battery recharge and transfer switch. I suppose if I worked at it I
>could get Ubuntu/EMC2 to boot quicker, though if I actually timed it, it
>might be close already. Also, I guess realtime is only needed for the
>governor, which I already have a mechanical version. There's more
>thinking to be done.
Sounds like. OTOH, I'd use a ups to stay up during the power failure, while
the impending shutdown script could be modified to start the generator before
the ups shuts you down. And conversely, shut the generator off after the
power has been good for say, 5 minutes. Release the load by switching back
to commercial power, and let it run unloaded for about another 5 minutes to
equalize temps and shut-r-down. That is all pretty much a std feature of
standby power plants and has been for 40 years that I know of. One of the tv
stations I was at back in the 70's, a uhf back when uhf stations were the
power companies best customer. We had a 150 kw Cummins 335 powered standby
generator that was kept warm, and converted a power failure into a 5 second
outage. But it wasn't big enough to run the transmitter at full song, so
both klystrons got throttled to about half power in order for that teeny
little 335 come-along could maintain its rpms. Our normal meter spin was
about 225 kw/hour. Wayne County Public Power loved us. For obvious
reasons. :)
>Happy Thanksgiving to everyone.
Yes, thanks, we had a good one ourselves, and I hope everybody here did. Tis
the season.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
*** Topic for #redhat: ReDHaT is the answer to all your problems. It
could be the start too!
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