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Max The Magnificent
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Re: This is going to be awesome.
Max The Magnificent   8/24/2014 12:37:48 PM
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@Hamster: Maybe make the seconds tick inconsistently, but have it bang-on when the seconds hand goes from full scale back to zero.

Sometimes it's almost like you are reading my mind -- in fact I'm planning on writing a follow-up column about possible operating modes and associated sound effects.

Max The Magnificent
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Re: This is going to be awesome.
Max The Magnificent   8/24/2014 12:36:09 PM
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@Hamster: Max, this is going to be an awesome project - one where I think everybody will get the juxtaposition of old and new tech.

Well, of course it's an awesome project -- you suggested it LOL

 

Max The Magnificent
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Re: Driving the Meters
Max The Magnificent   8/24/2014 12:34:46 PM
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@Clarke: ...Do you have the voltage and current specs for each?  I imagine they'll require more power than a microcontroller output could provide...

That's one of the problems in that you usually can't find any documentation for the meters. Also you often end up modifying them by removing shunt or series resistors. Also you have to be careful measuring the internal resistance -- in some cases you can "blow up" the meter using (trying to use) a multimeter to determine the resistance.

In some cases like a meter that's geared to to measuring say 10mA max, you could drive this directly from the MCU output -- but you also have to remember that the meter itself can generate negative voltages due to reverse/back EMF. Personally, I prefer to use the MCU output to drive a transistorm and have the transistor drive the meter -- all of this will be covered in my forthcoming blog.

Max The Magnificent
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Re: Driving the Meters
Max The Magnificent   8/24/2014 12:29:40 PM
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@Clarke: ...I'm curious how you're planning to drive these meters...

I'll be using the MCU's PWM outputs -- Ill be writing a blog about this in the next week or two (as soon as I get some time LOL)

Max The Magnificent
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Re: Vintage Time Delay Relay
Max The Magnificent   8/24/2014 12:28:01 PM
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@larussell: How about doing the whole thing analog?

Do I look like the sort of man who would soil his hands with analog when digital is so much more "shiny" and "tasty"?

hamster_nz
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This is going to be awesome.
hamster_nz   8/24/2014 5:01:58 AM
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Max, this is going to be an awesome project - one where I think everybody will get the juxtaposition of old and new tech.

I still think that making it "dead on" accurate using a GPS time source would be pretty cool - "I'll just sync my pocket watch with atomic clocks orbiting the earth, using my steam-punk analogue meter clock".

Maybe make the seconds tick inconsistently, but have it bang-on when the seconds hand goes from full scale back to zero.

You could almost sell these :-)

ClarkeMonroe
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Driving the Meters
ClarkeMonroe   8/24/2014 12:12:56 AM
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Neat project!  I've lived more in the digital realm than the analog, so I'm curious how you're planning to drive these meters.  Do you have the voltage and current specs for each?  I imagine they'll require more power than a microcontroller output could provide so I'll have to stay tuned for the next report to learn how you plan to do that.

larussell
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Re: Vintage Time Delay Relay
larussell   8/22/2014 5:17:49 PM
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How about doing the whole thing analog? Each meter can be driven from a timebase like an oscilloscope or analog computer. You can sync between them the same way the horizontal and vertical waveforms are synced in an analog TV, but with more stages. And then sync the whole thing to 50/60 Hz line frequency to keep accurate time.

smpowell
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Re: Sorry to have missed it
smpowell   8/22/2014 2:49:06 PM
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>Good museum (National Museum of USAF) as well, or so I'm told.

It's also huge. Plan on half a day at least.

Dayton also has the (Carillon Historical Park) A legacy of the  days when Dayton was a technological powerhouse in the 19th and early 20th centuries.

GSKrasle
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Re: 32.768kHz crystals
GSKrasle   8/22/2014 1:50:09 PM
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Yeah, parabolic. A-T is third-order. For both, cut angles can select the curve parms, making the field wonderfully complicated. I used to have a booklet from Fox with some details, but can't find it; things like using crystals in series to get compensation, DC bias effects, good stuff.

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