Another Nixie clock built by me, this time using ESP8266. The project is based on a schematic with software found somewhere in Russian forums. The lamps in the clock are the Z573M. For control, the NodeMCU v3 module, 74hc595 shift registers and k155id1 BCD decoders were used. The casing is made on a 3018 CNC milling machine from 10 mm plywood glued in layers. PCBs also milled on the CNC3018 (1 prototype in the photos, finally the path layout has been improved).
HV converter made according to Mirley's diagram. The efficiency I achieved is 10 mA with a 12 V supply. The lamps are turned off through the PC817 optocoupler and the 5 V relay, which switches on the HV converter power supply. The resistor on the anodes of the lamps was selected to draw a current of 2 mA.
The system updates the time via Wi-Fi. In addition, there is an OLED 128x64 screen mounted in the bottom cover and an encoder with a menu button, which is operated with a flat screwdriver through the hole in the bottom cover. The software has functions such as:
- setting the time zone
- automatic summer / winter time
- hours in 12/24 mode
- turning on / off the flashing of the second hand
- cathode protection for Nixie lamps, i.e. the effect of counting each digit, set every 1,2,5,10,15min or switching the effect off
- automatic switching off / switching on at a preset time
- OLED screensaver
- activation 0 in the first hour column
Hello! I see that there is a batch for NodeMCU and I would like to clone it, but on universal boards - I haven't learned how to design a PCB yet. Could I use Dolam LC-516 tubes, 25 PLN NOS costs? Of course, a different housing, a converter, could be done with the NE555 and it also works, I have the IN-12 watch from the Allegro set myself. The Z573M lamps are not cheap and the Russian ones are a mess for years (as not forever).
You can easily use the LC-516, I recently bought the 573m for PLN 30 / item. I gave up the NE555 converter from the mirley project, the transistor got hot when I connected 4 tubes at once (8 mA consumption), which made the voltage unstable, no problem at the current one.
Hello! Can I provide such a solution instead of 74141 and shift registers? Such an invention, I cannot provide links to the auction here. The political situation is uninteresting for the East and if the K155ID1 is damaged, I have a job on ... because the second IC is not going to be bought. I would rather not like to hoard these systems, it's not cheap.
K155id1 are in abundance on allegro yet. Recently, I was buying for PLN 10 / item. The PCB you show can be used, but you have to rewrite the program, unless there is also a bcd decoder and transistors at the end.