Re: "Nixietherm" IN-9 bargraph based thermomer

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9 years 5 months ago - 9 years 3 months ago #1280 by Mr.Nixie
I'm just designing an easy to build thermometer kit based on the Russian IN-9 bargraph Nixie tube.
My intention to do such a thing was a photo I've found on the internet:



Now the very first prototype is ready. The goal was to use only easy to understand analogue technique, no pic and no processor. So measurement can only done with a multimeter.



The thermometer is powered via 5V from one or two USB ports (depending on the PC's power capacity, sometimes a power Y-cable is needed) or from a cheap external USB loader.

See here a video from this prototype and also some photos








Thanks to the big size of the base I can used "hrugged" electronic parts which are not as filigree as used in my clocks. So assembling the kit is very easy.

Edit:
Prices and availability - The kit will cost 79 EUR plus shipping (10 EUR for overseas) fully completed incl. case, scale, IN-9 tube and USB-cable and I hope that I can deliver the first kits at the beginning of April.
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Last edit: 9 years 3 months ago by Mr.Nixie.

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9 years 5 months ago #1281 by Beast Lee
Very kOoL, when will you be taking orders for this...?
:woohoo:

"It has to have an ending to exist" - Beast Lee
"If it doesn't have a V8, it's not a sport" - Beast Lee

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9 years 5 months ago #1283 by neonglass
Put me on the list for one. Could one add an external probe for outside temperature?

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9 years 5 months ago #1285 by Mr.Nixie
Replied by Mr.Nixie on topic Re: "Nixietherm" IN-9 bargraph based thermomer
The termometer has a second input, but actual the circuity isn't able to display temperatures lower than 2°C.
The measurement range of this input is actual +30°...+60°C and can be used e.g. to monitor the processor temperature of the PC.
But I can do a redesign for an extended temperature range on the second input, displayed on the left scale, let's say -20°...+40°C

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9 years 5 months ago #1289 by michail1

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9 years 5 months ago #1292 by Mr.Nixie
Replied by Mr.Nixie on topic Re: "Nixietherm" IN-9 bargraph based thermomer
Hhm, it seems that I have to redesign the step up converter (5V --> 125V). It generates heat, not too much for a Nixie clock but too much for a thermometer with build in temperatur sensor. So the displayed temperature will be around 3°C too much when powered on for a while. :blush:

These modifications will also lower or disable the switching noise generated by the inductor...

The transforming of the sensor's output voltage (100 mV @ °C, eg. 200mV @ 20°C) to the display graph lenght however is extrem exact :)

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