Logic board

hinatadayo·nixie-token-display·kicad/logic-board/logic-board.kicad_pcb

Logic board layout, top view — open source RP2040/RP2350 board by hinatadayo

About the Logic board

Logic board is an open source RP2040/RP2350 PCB design by hinatadayo, published on GitHub. It is a 2-layer board measuring 100 × 75 mm, with 18 components from 10 distinct parts.

Its main chip is the RaspberryPi_Pico, from the RP2040/RP2350 family. Other key parts include the 74HC595. By type, the board carries 8 resistors, 4 capacitors, 3 ICs, 2 connectors and 1 transistor.

It belongs with the displays & leds designs in this gallery.

From the project

nixie-token-display-schematic.md(Rev 0.2)に基づく 3 枚基板構成。 回路図・基板ともに Python (kiutils + 直接 S 式生成) でプログラム生成している。

nixie-token-display-schematic.md(Rev 0.2)に基づく 3 枚基板構成。 回路図・基板ともに Python (kiutils + 直接 S 式生成) でプログラム生成している。

分け方の制約はカソードバスにある。カソードは全桁で共有するので桁ごとの基板には できず、かといって管と同居させると 1 枚が大きくなりすぎる。だからカソードドライバだけ 独立させた。

カソード 10 本が全部 200V ネットで、1 本あたり 1.3mm の通り道が要る (線幅 0.3mm + クリアランス 1mm)。この 10 本は全部の管に行くので、 管 1 本の脇を必ず 10 本とも通過する。管どうしの隙間は ピッチ − 15.1mm:

4 桁が、管基板を 100×100 に収められる最大の桁数。 仕様書 1 章の 3 モード (残量 %、トークン数、リセットまでの時間)はいずれも 4 桁で表現できる。 6 桁にするなら 4 層化するか沿面 1mm を緩めることになり、どちらも設計判断。

Main components on the Logic board

Logic board bill of materials (BOM)

18 components, 10 distinct parts.

QtyPartRefs
2
74HC595
U1, U2
1
RaspberryPi_Pico
U3
1
MPSA42
Q1
1
TO_DRIVER_BOARD
J1
1
HV_Module_LV
J3
3
0.1uF
C1, C2, C3
1
100uF/10V
C4
2
10k
R1, R2
1
2.2k
R3
5
120k
R4, R5, R6, R7, R8

Logic board design files

The KiCad project lives in the hinatadayo/nixie-token-display repository on GitHub; these links point at the commit this page was built from.

Logic board: common questions

What microcontroller does the Logic board use?

The Logic board is built around the RaspberryPi_Pico, from the RP2040/RP2350 family.

How big is the Logic board?

The Logic board measures 100 × 75 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Logic board?

18 components, from 10 distinct parts. The full bill of materials is listed on this page.

Where can I download the Logic board design files?

From the hinatadayo/nixie-token-display repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Logic board design in my own project?

The repository has no license, so all rights stay with hinatadayo. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Logic board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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