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DrFPGA
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Re: What no Sun Dial
DrFPGA   8/21/2014 6:35:20 PM
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and it works in the dark too!

David Ashton
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Re: What no Sun Dial
David Ashton   8/21/2014 4:56:46 PM
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@Crusty...GREAT idea.  You could have a curved line of RGB LEDs some distance above the sundial to simulate the sun, clear ones that have a narrow beam. and illuminate them one at a time, changing every 10 minutes or so (this implies 72 LEDs for 12 hours) and use one colour for day and another for night.  Wouldn't need any motors, just some electronics to drive the LEDS.  Since your LEDs would be fixed you wouldn't need to compensate for the seasons either...

Max The Magnificent
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Re: Sorry to have missed it
Max The Magnificent   8/21/2014 4:31:01 PM
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@mhrackin: I'll be retired by then and would definitely be up for a road trip.

Antedeluvian's idea is sound -- we could all make our way there -- have a happy time at the Hamfest, and spend a couple of days all going round the local museums together.

Max The Magnificent
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Re: Sorry to have missed it
Max The Magnificent   8/21/2014 4:29:38 PM
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@Antedeluvian: Looks like Dayton is about 7 hrs from Toronto. Maybe you should organize an EELive Get-Together. Good museum (National Museum of USAF) as well, or so I'm told.

Maybe we should at that ... let me think about it...

Max The Magnificent
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Re: Very nice!
Max The Magnificent   8/21/2014 4:28:46 PM
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@Duane: Or, maybe something with Neopixels.

I wouldn't dream of doing a project without them -- I have a perfectly sized-shaped vacuum tube to sit on the top of thsi clock with NeoPixels underneath it...

Max The Magnificent
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Re: Magic Eye Tube?
Max The Magnificent   8/21/2014 4:27:05 PM
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@mhrackin: Is that your "secret ingredient" to go up top center?

Actually, I have something else in mind, but I might have to add one of these also...

Max The Magnificent
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Re: What no Sun Dial
Max The Magnificent   8/21/2014 4:25:46 PM
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@Crusty: ...I think this might just end up on my whacky to do list...

Hi Crusty -- this is actually a really nice little project -- simple in some respects, not-so-simple in others, and the final result can look really fantastic if you do the case right.

Max The Magnificent
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Re: Timeofdayometer
Max The Magnificent   8/21/2014 4:23:46 PM
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@HeyJoe0: Another issue was that, although I used a 32.768KHz xtal timebase, my time would drift.

I'm planning on using a real-time clock module in mine -- that makes life much easier :-)

Max The Magnificent
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Re: Timeofdayometer
Max The Magnificent   8/21/2014 4:22:27 PM
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@HeyJoe: I built an analog timeofdayometer...

I like your siolution of displaying hours 1-6 and then 7-12 with minutes inbetween.

Another solution might be to have a "rest" position on the left and then hours 1-12 and minutes 1-60 shown as concentric scales. The needle could start off in the "rest" position -- then move to indicate the hour -- then move to indicate the minute -- then return to the rest position...

 

Max The Magnificent
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Re: Timeofdayometer
Max The Magnificent   8/21/2014 4:19:14 PM
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@HeyJoe: ...On my next iteration Im going to use a linear scale and apply a nonlinear correction factor on my output value.

That's something I might be doing -- alternatively, for some ptojects I might want a non-linear scale that doesn;t match the non-linerarity of the meter. In thsi case I might use a look-up table approach and then interpolate between table values.

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