Build Yourself a Nixie Tube Clock
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This document is a presentation by 李祐棠 on building a nixie tube clock, highlighting challenges related to sourcing components, high voltage circuits, and custom PCB design. It details solutions for controlling the nixie tubes including recommended ICs, microcontrollers, and PCB design tools. The presentation also provides links to resources for further information and open-source code related to the project.
Build Yourself a Nixie Tube Clock
- 1. Build Yourself a Nixie Tube Clock 李祐棠 YODALEE <LC85301@GMAIL.COM> COSCUP 2019 1
- 2. About Me Yodalee <lc85301@gmail.com> Study EE in college, Microwave in graduate school, now rookie engineer in Synopsys. 2 Github: yodalee Blogger: http://yodalee.blogspot.tw
- 3. Why I Make This 2011 animation Steins;Gate 3 2018 animation Steins;Gate 0 The real reason:
- 4. Nixie Tube 4 Nixie Tube LED 7 Segment Display Used in 1955 - 1970 1970 - present Drive voltage 180 V 3 V Drive current 0.3 - 2.5 mA 10 mA Others Fragile Robust Cathode Anode
- 5. Nixie Tubes Revival 5 https://en.wikipedia.org/wiki/Nixie_tube#/media/File:Nixie_Wozniak.jpg Nixie Watch Nixie ClockPortal 2
- 6. Challenges 1. Where to buy it? 2. How to get 180V power? 3. How to control it? 4. How to make custom PCB? 6
- 7. Challenge 1 : Where to Buy It Ebay: IN-14 Used: USD 5 / pcs, New: USD 12 / pcs Totally new from Dalibor Farny: USD 145 / pcs 7
- 8. Challenges 2: High Voltage Circuit DC Boost Converter: from 12V to 180V. Make your own or buy one. Control chip: MC34063. Switch MOS: IRF840 Inductor: 100uH coil (important!) Voltage Divider: 511k / 3.3k + 2k variable Control range: 120 ~ 193 V 8 https://upload.wikimedia.org/wikipedia/commons/4/4a/Boost_circuit_2.png
- 9. Challenges 2: High Voltage Circuit 9
- 10. Challenges 2: High Voltage Circuit 10 How do you control 180V current Solution Disadvantage K155ID1 high voltage driver IC Difficult to buy TLP521 Photocoupler VCEO = 50V MPSA42/92 NPN/PNP transistor
- 11. Challenges 3: Controller 11 RTC: DS1307 12V to 5V: 78M05 Decoder: 74HC238, 74CD4514 Controller: Atmega328p
- 12. Challenges 3: Controller 12 In the good old days, we write our bare metal program. Nowadays, we have Arduino. Write Arduino bootloader to Atmega328p chip. https://www.arduino.cc/en/Tutorial/ArduinoToBreadboard Configure to use internal 1MHz clock. Program with serial TX/RX pin
- 13. Challenges 4: Custom PCB 14 Layout with EasyEDA: https://easyeda.com Fabrication with JetPCB: http://tw.jetpcb.com/ V1.01 Size 26.4 cm x 10.4 cm
- 14. Challenges 4: Custom PCB Software Choice: Protel, Altium (proprietary), EasyEDA, Eagle (need register), Kicad (free) EasyEDA advantage: Component/Layout are shared, easy to import other’s component. EasyEDA disadvantage: Lag when edit a lot of components Some function are difficult to use 15
- 15. EasyEDA 16
- 16. EasyEDA 17
- 17. EasyEDA 18
- 18. EasyEDA 19 Signal line width: 0.4mm Power line width: 1.0 ~ 1.2 mm
- 19. EasyEDA 1. Draw schematic 2. Convert to layout 3. Draw layout 4. Place copper layer Easy right? 20
- 20. Nixie Tube 21 Current limiting resistor: 22K for digit, 75k for dot Buy nixie tube base => Difficult to buy. Use single IC socket as base
- 21. Programming Control DS1307 using Arduino Library https://playground.arduino.cc/Code/Time Write my own function to read/write 56 bytes NVRam on DS1307 to store information. Do not light up single digit constantly. Cathode poisoning on other cathode. 22 // core code fun updateTube: for each tube: update Tube // 74HC238 update number // 74CD4514 delay(2);
- 22. v1.02 23 V1.02 (photo by HeiHei), shrink size to 26 cm x 8 cm Progress so far: it can light up tube.
- 23. V2.0 24 • Split PCB to nixie tube PCB and control PCB • New high voltage circuit http://www.nixieclock.org/?p=1454 • Use SMT component. • Replace DS1307 with DS3231 No schedule right now
- 24. Open Resource Note: https://yodalee.blogspot.com/2018/10/nixie-clock0- introduction.html Source code: https://github.com/yodalee/NixieClock V1.01 Schematic and Layout: https://easyeda.com/lc85301/nixieclock V1.02 Schematic and Layout: https://easyeda.com/lc85301/nixieclock_v1-02 25
- 25. Reference 1. Wikipedia: https://en.wikipedia.org/wiki/Nixie_tube 2. Tube-Tester: http://www.tube-tester.com/ 3. 復古咖啡 (Closed) 4. 工作狂人 26
- 26. Thank You for Listening EL PSY CONGROO 27