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Old 6th October 2005, 09:15 PM   #1
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Default Hybrid thermometer with Nixies

Hello fellas!

I'm not in the mood these days for programming a uC, so was wondering for the several possibilities of making a Nixe thermometer.
One is a electromechanical approach where an analog needle thermometer directly activates eahc nixie cathode, and the other using an LM35, but interfacing it to the Nixie using common logic IC/discrete components is intriguing me.

Any thoughts?
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Old 6th October 2005, 11:08 PM   #2
moamps is offline moamps  Croatia
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http://www.merseypub.com/nixie/nixie2.htm
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Old 7th October 2005, 08:33 AM   #3
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thank you for the link moamps, but it has a PIC in it... :S
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Old 8th October 2005, 02:13 AM   #4
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..suppose one digit is easy with a LM3914/15 bargraph driver

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Old 8th October 2005, 02:23 AM   #5
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Thinking out loud:
LM35 used to set up voltage on one leg of a comparator
constant current source charges a cap connected to other leg
comparator output used to gate an oscillator which drives a counter which drives the nixie
reset start again?
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Old 8th October 2005, 09:24 AM   #6
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That LM3914 is a very good idea!
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Old 10th October 2005, 07:32 PM   #7
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Exclamation Basic display schematic - is this ok?

Here's a display schematic using 4 LM3914.
The datasheet is badly explained as to more precise indications for the pins, so i used a voltage divider to setup more precisely the voltage roll-off points.
What's the general opinion? Is it ok?
The output transistors for the nixies are missing, as is the LM35, since they can be placed on a different place/board, and i could also use a LED/Nixie dual display thermometer.

Thank you to everyone.

PS: Can someone explain in layman terms how to use in a more correct way the LM3914?
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Old 11th October 2005, 11:17 PM   #8
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I'm having trouble figuring out how you will drive incremental nixies.
We need a higher resolution diagram- the writing is hard to see...
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Old 12th October 2005, 12:36 AM   #9
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anything you can do with a PIC you can do with solder and a bunch of TTL -- but you will go insane in the process -- parenthetically I made my first impedance tester out of discrete TTL.

National has some Nixie driver schematics on their website.

I think that the Dallas Semi thermal devices might be easier to interface...
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Old 12th October 2005, 01:44 AM   #10
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Quote:
anything you can do with a PIC you can do with solder and a bunch of TTL -- but you will go insane in the process --
but it is fun to think in a different direction

The challenge to me AFAICT here is to be able to expand past the first bargraph/nixie "module".
Seems the higher next higher order module (eg"tens") unit would need to use its own output to step-shift the lower order's (eg"ones") "reference"/ground.

or just throw a bunch of TTL at the problem....
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