The next thing on the list to build with some nixie tubes was… a nixie thermometer .

The thermometer will measure the temperature using an LM75. Also the highest and lowest temperature will be saved in the PIC EEPROM. As an additional feature the thermometer will keep basic track of time. This is done so that the tubes can shut down between 1:00 AM en 7:00 AM in order to expand there life. All the features are controlled with 1 push button. After power up you first have to set the current time. This is done by keeping the button pressed. Once the time is set you can scroll through the measured temperatures: First is highest temperature. Second is lowest temperature. Third is current temperature. In order to make the thermometer less reactive. It takes an average from 120 samples over a time span of 2 minutes (1 sample every 2 seconds).

Sorry, I don't have a complete BOM. But all values are included in the schematic. Only note that:

T3, T4 MPSA42
T7, T8 MPSA92
T10    BC557
IC7    tlc548

To SV2 you connect the LM75. To SV3 you connect the tubes and to SV1 you connect the neon bulbs.

And here is the result .

The hex-file can be downloaded here: thermo.hex (9 kB)
The Proton PIC basic file can be downloaded here: thermo.bas (9 kB)
A Cadsoft Eagle library with all Russian nixie tubes can be downloaded here: russian-nixies.lbr (22.6kB)