ZM1350 / IN-18 dual clock project
newxito
I only have 7 ZM1350 so I don’t want to make just a word clock. The idea is to have 6 IN-18 showing the time and 6 ZM1350 hanging over the IN-18 showing words and displaying some other information.
For now, I have managed to build a ZM1350 socket based on an ATmega328p and MMBTA42 transistors for all 16 segments including dot and cursor. I have used the datasheet resistor values. The socket works as I²C slave.
I also wanted to build a new nixie controller board using “modern” and efficient components.
Here is some information about this board:
- Transient, reverse, under and over voltage protection (LTC4365)
- Fuses for VIN and on-board HV
- High speed switching 3.3V and 5V supplies (MP1584)
- On-board LT3757 based 170V flyback module and/or connector for external HV supply
- ESP32
- 3.3V to 12V level shifters (BSS138 mosfets)
- 2 x 32 bit HV shift registers (HV5622)
- Connectors for GPS, PIR and temperature sensor
- Extension connectors for additional shift registers, I²C, MP3 module, RGB/SK6812 LEDs and spare data pins
- DS3231 RTC with battery backup
- 3 buttons
- Flash connector and buttons for the ESP32
- 2 status LEDs
The board is untested, and I have to write the entire software for the ESP32 and also the Android app. I’m new to the ESP-IDF and Android Studio so this will be a long project…
Kevin A.
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Organs Grinder
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newxito
I’m not an EE and I don’t want to deal with disclaimers/liability, open hardware, open source licenses and so on. It’s just a hobby for me. That’s why I do not sell any kits or assembled boards and I do not provide any schematics or gerbers. Sorry about that.
This forum is great and sharing ideas and basic information about the projects is my way to give something back.
Speaking of ideas: I’m currently working on another two projects:
I’m trying to make a nixie clock driven by a C64, of course using commodore basic with a lot of peeks and pokes :-) Because I don’t want to break an original C64, I bought a clone. The good news: there is plenty of space inside the case for the clock board and there is also space for the nixies and a small hdmi display. The bad news: there are no serial/cassette/user ports. Maybe I can use a USB port to drive the shift registers…
I’m also working on a 13 digits nixie calculator (IN-17) with clock function, clicky mechanical keys and 3D printed old style case. By the way, if anyone knows a small (IN-17 size) nixie with a minus sign, please let me know.
newxito
Kevin, thanks for your input. I will have a look at platformIO, sounds very interesting. Currently I’m using the Arduino framework. Because I want to use flash encryption to hide passwords, I will try the ESP-IDF.
Nick
newxito
I recently moved to VS Code and PlatformIO but still based on the Arduino framework. As far as I know, PlatformIO also supports the ESP-IDF but I was too lazy to switch so far.
I use EasyEDA, you can search for MY_ZM1350. I'm not sure but I think there is only a (beta) direct export to Altium.
