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GPS-Driven, FPGA-Decoded Nixie Tube Speedometer, Part 2

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Max The Magnificent
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Call me...
Max The Magnificent   12/3/2013 3:05:45 PM
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Call me "old fashioned" if you will, but I LOVE anything to do with Nixie Tubes...

bobdvb
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VHDL
bobdvb   12/4/2013 5:51:34 AM
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Okay, I admit I don't know much about VHDL and FPGA programming, but a lookup table for the speed? Was that really the most efficient mechanism? At least I would have expected the leading 0's to have used something shorter.

Victor Lorenzo
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Victor Lorenzo   12/4/2013 6:29:06 AM
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@Max, "Call me "old fashioned" if you will, but I LOVE anything to do with Nixie Tubes...", Call me too.... I specially like those green nixies from the old cassio calculators, all contained in the same vacuum tube.

Victor Lorenzo
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Re: VHDL
Victor Lorenzo   12/4/2013 6:36:54 AM
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@bobdvb: "Was that really the most efficient mechanism?" It depends on what your primary parameter "efficiency" referes to. Lookup tables are very efficient in execution time (clock cycles required for completing), but could eventually require much more LEs or cells in applications like this one.

Max The Magnificent
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Max The Magnificent   12/4/2013 10:16:19 AM
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@Victor: I specially like those green nixies from the old cassio calculators, all contained in the same vacuum tube.

Tasty!!! One of my background hobby projects is to build a simply 4-bit processor out of a mix of tecxhnologies (relays, vacuum tubes, transistors, magnetic cores, etc.) and you can be Nixie Tubes will feature in there somewhere...

vvc0
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Reducing Lag
vvc0   12/4/2013 2:45:11 PM
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It should be possible to reduce the speed update lag by employing an accelerometer to calculate the velocity during times of acceleration or deceleration. This might be slightly more compute intensive in an FPGA, but should be do-able in a microcontroller as well.

Victor Lorenzo
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Victor Lorenzo   12/5/2013 2:19:14 AM
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@Max, "One of my background hobby projects is to build a simply 4-bit processor out of a mix of tecxhnologies"

Something like this (http://www.youtube.com/watch?v=4IxWSvlcP3c/http://hackaday.com/2010/06/08/duo-128-elite-4-bit-cpu/)? We could say it's a "computer-in-a-box" ;)



I hope it will be more portable than this:



Perhaps you're interesting in taking a look at this too: http://www.northdownfarm.co.uk/rory/tim/tim-8.htm/http://www.youtube.com/user/rapidrory?feature=watch.

Max The Magnificent
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Max The Magnificent   12/5/2013 10:32:40 AM
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@Victor: Something like this...

Well, that is very tasty -- but I was thinking something more like this paper I wrote ages ago.

Victor Lorenzo
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Re: Call me...
Victor Lorenzo   12/5/2013 1:48:47 PM
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@Max, That's a RAM!!! "A ball bearing in its associated left-hand receptacle could represent a logic 0, while the right-hand receptacle could represent a logic 1 (or vice versa)"

At least for this RAM type the 'charge' and its 'stable states' will be more 'visually' representable. We will even be capable of seen the 'charges moving' from one stable state to the other! I'll like to see that!

Caleb Kraft
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Caleb Kraft   12/5/2013 5:38:40 PM
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glass and glowing electrodes? I'd call you names if you DIDN'T like them!

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