1U rack mounted nixie display with IN-4 and INS-1 tubes.
Uses an ESP32 and, optionally, a temperature sensor (such as the TMP36).
The display, on its own, cannot actually do anything.
It is designed to be used in tandem with its extensive REST API that allows complete control over the display:
- Controlling each individual tube (IN-4 & INS-1).
- Both digits and brightness.
- Controlling the tube LEDs (red) (not individually, as of PCB REV1).
- Controlling the onboard LED (blue).
- Basic authentication mechanism to ensure only select devices can talk to the display.
Here is REV1 of a fully assembled unit mounted in a rack.
This project uses the following components:
- 6x
TLP627 - 4x
IN-4 - 4x
SN74141 (or clones) - 2x
INS-1 - 1x
TMP36 - 1x
ESP32 - 1x
LDO 3.3V regulator
Exclusively SMD components are used where applicable.
HV devices/traces use THT instead, as clearances and creepage distances would be violated otherwise.
The device runs on 5V max and gets fed using an onboard micro-USB socket.
Additionally, it can be fully turned off using a dedicated slide switch.
The 170V regulator has been sourced externally and is not included in the component list.
Virtually any regulator works, as long as it has similar dimensions to the popular NCH8200HV.
To save on vertical space (to stay within the 1U mounting constraint), the BCD-Decoders and opto-isolators reside on extension boards.
These are connected using standard 2.54mm headers.
It is recommended to mount them using straight 2.54mm headers, just to reduce the risk of accidential shocks.
Please refer to the wiki for documentation.