There are plenty of SPI interface screens on the market, but few of them have the charm of the good old Nixie tube. [Tony] decided to whip up a simple three-Nixie module that could be addressed via… ...

The round display has a maximum colour depth of 16.7M colours (RGB), a typical brightness of 300cd/m2 and, thanks to IPS technology, is impressively easy to read in all directions. The HMI module ...