2 layers149 × 8 mm
Buttons board
mistic100/Nixie-Clock-IN2
Check out my other projects: - Nixie Clock IN14 - Nixie Clock IN12 - IV-27 VFD Clock
4 parts10
2 layers167 × 52 mm
In-2-nixie
mistic100/Nixie-Clock-IN210Check out my other projects: - Nixie Clock IN14 - Nixie Clock IN12 - IV-27 VFD Clock
- Size
- 167 × 52 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 88
- Pads
- 196
- Tracks, vias
- 316, 75
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 28 Jan 2026
- Updated
- 27 Jun 2026
Overview
In-2-nixie is an open-source printed circuit board by mistic100, from the mistic100/Nixie-Clock-IN2 repository on GitHub. It is a 2-layer board of 167 × 52 mm with 34 parts on 88 nets, routed with 316 tracks and 75 vias.
It is built around the BME280, HV5222PJ-G and WS2812B, with the DS3231S# and MPSA42 among its other parts. Its parts include 9 resistors, 6 connectors, 5 diodes, 4 ICs and 2 capacitors. It belongs with the lEDs and displays boards and the ESP32 and RISC-V boards of this library.
Main components
5
BME280
LGA-8(2.5x2.5)-40℃~+85℃ 0%RH~100%RH 1.71V~3.6V 1.8uA 16bit I2C、SPI ±0.5℃ ±3%RH LGA-8(2.5x2.5) Temperature and Humidity Sensor ROHSBoschTemperature And Humidity SensorHV5222PJ-G
PLCC-44(16.6x16.6)-40℃~+85℃ 1 10.8V~13.2V 32 Open-drain Serial-to-Parallel PLCC-44(16.6x16.6) Shift Registers ROHSMicrochip TechnologyShift Registers
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
DS3231S#
RTC, I²C, ±3.5ppm, SOIC16Maxim Integrated (Analog Devices)Uncategorised
MPSA42
TO-921 NPN 1.5W 100nA 300V 40 500mA 500mV 50MHz 6V NPN TO-92 Bipolar (BJT) ROHSFoshan Blue Rocket ElecBipolar (BJT)
README
README.mdNixie Clock IN-2
Check out my other projects:
This is a Nixie Clock using small IN-2 tubes and a 16x9 LED matrix. It was mostly inspired by this 3D model 80s Alarm Clock by Tom Seddon.
Key features
- 3 buttons and 1 rotary encoder
- Zigbee connectivity
- receive date-time
- receive weather
- send room temperature and humidity
- can be toggled on/off
- 3 generic buttons send click, double click, long click events
- small LED matrix with multiple screens
- scrolling date
- temperature
- falling sand animation
- Game of Life animation
- fire animation
- rain animation
- possibility to use a DS3231 RTC module (routed on the PCB but not available in current firmware)
BOM
- ESP32-C6 SuperMini
- Adafruit Charlieplexed 16x9 LED matrix + IS31FL3731 driver
- 4x IN-2 Nixie tubes
- 2x INS-1 Nixie indicators
- Microchip HV5222 serial-to-parallel converter
- Adafruit 4 channels TTL level-shifter
- 4x APA106 5mm adressable LEDs
- BME280 ambient sensor
- EC11 rotary encoder
- 3x 6x6x4.3mm push buttons
- MPSA42 high voltage NPN transistor
- USB-C connector
- resistors, capacitors, diodes...
Schematics
PCB
Case
License
The Arduino code, the KiCad design and SolidWorks files are distributed under the Creative Commons 3.0 BY-SA license.
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R4, R5 |
| 4 | IN-2 | in-2-nixie:IN-2 Nixie Tube (w. pins) | T1, T2, T3, T4 |
| 4 | WS2812B | in-2-nixie:APA106_D5-Staggered_Pins | D2, D3, D4, D5 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R6, R8 |
| 2 | 200k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R9 |
| 2 | INS-1 | in-2-nixie:INS-1 Nixie Tube | L1, L2 |
| 1 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C3 |
| 1 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | 330u | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C1 |
| 1 | 33k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R10 |
| 1 | BME280 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | Buttons | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | DS3231 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J6 |
| 1 | ESP32-C6 SuperMini | in-2-nixie:ESP32-C6 SuperMini | U3 |
| 1 | Encoder | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | HV5222PJ | in-2-nixie:PLCC-44 LongPads | U1 |
| 1 | LOGO | in-2-nixie:sp_logo | G*** |
| 1 | Level Shifter | in-2-nixie:Adafruit Level Shifter | U4 |
| 1 | MPSA42 | Package_TO_SOT_THT:TO-92_Inline | Q1 |
| 1 | Matrix | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Nixie HVPS | in-2-nixie:Neonwork Nixie Power Supply | U2 |
| 1 | Power | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J4 |
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Questions
How big is the In-2-nixie PCB?
It measures 167 × 52 mm and has 2 copper layers, 1.6 mm thick.
What parts does the In-2-nixie use?
34 parts, built around the BME280, HV5222PJ-G, WS2812B and DS3231S#. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the In-2-nixie KiCad files?
From the mistic100/Nixie-Clock-IN2 repository on GitHub, at the commit this page was made from: the board is main-board/in-2-nixie.kicad_pcb and its schematic buttons-board/buttons-board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the In-2-nixie design in my own project?
Its repository states no licence, so its author keeps all rights: ask mistic100 before reusing the design.