2 layers97.5 × 86.5 mm
2 layers50 × 50 mm
Wordclock main
AlanFromJapan/pcb-designMy PCBs designs
- Size
- 50 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 38
- Nets
- 46
- Pads
- 239
- Tracks, vias
- 322, 34
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 1 May 2020
- Updated
- 27 May 2026
Overview
Wordclock main is an open-source printed circuit board by AlanFromJapan, from the AlanFromJapan/pcb-design repository on GitHub, published under the MIT licence. It is a 2-layer board of 50 × 50 mm with 38 parts on 46 nets, routed with 322 tracks and 34 vias.
It is built around the DS3231S# and DS3234S#. Its parts include 4 capacitors, 2 ICs, 1 transistor and 1 connector.
Main components
2
DS3231S#
RTC, I²C, ±3.5ppm, SOIC16Maxim Integrated (Analog Devices)Uncategorised
DS3234S#
SO-20-300mil-40℃~+85℃ 1.5uA 2V~5.5V 400uA Built-in SPI Temperature compensation、Backup power management and battery charging、InsideSRAM/NVRAM、Programmable clock output、Alarm function Yes SO-20-300mil Real Time Clocks ROHSMaxim Integrated (Analog Devices)Real-Time Clocks (RTC)
README
SA22C-PulseExtender/README.mdA simple NOT gate and a 555 monostable to "show" on a LED a 400 ns pulse every second that your eyes won't see otherwise.
Parts
38| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | SOLDERJUMPERNO | Wordclock-main:SJ_2S-NO | SJ2, SJ3, SJ4, SJ5, SJ6, SJ7, SJ8, SJ9, SJ10, SJ11 |
| 8 | M14 | Wordclock-main:1X14 | JP1, JP3, JP4, JP5, JP6, JP7, JP8, JP9 |
| 3 | @HOLE0, @HOLE1, @HOLE2 | ||
| 2 | Wordclock-main:1X05 | JPEAST0, JPSOUTH0 | |
| 2 | Wordclock-main:1X02_LONGPADS | UNK5V0, UNREGULATED0 | |
| 2 | 10k | Wordclock-main:0204_5 | PUSCL0, PUSDA0 |
| 2 | 22pF | Wordclock-main:C025-024X044 | C1, C2 |
| 1 | Wordclock-main:78XXL | IC2 | |
| 1 | Wordclock-main:BATTCOM_20MM_PTH | BAT1 | |
| 1 | 16MHz | Wordclock-main:HC49_S | Q1 |
| 1 | 4.7u | Wordclock-main:E2,5-6E | C4 |
| 1 | 47u | Wordclock-main:E2,5-6E | C3 |
| 1 | AVR_SPI_PRG_6PTH | Wordclock-main:2X3 | J1 |
| 1 | DS3231 | Wordclock-main:SO16W | U$1 |
| 1 | DS3234 | Wordclock-main:DS3234 | DS3234 |
| 1 | MEGA8-P | Wordclock-main:DIL28-3 | IC1 |
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Questions
How big is the Wordclock main PCB?
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Wordclock main use?
38 parts, built around the DS3231S# and DS3234S#. 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 Wordclock main KiCad files?
From the AlanFromJapan/pcb-design repository on GitHub, at the commit this page was made from: the board is Wordclock/Wordclock-main.kicad/Wordclock-main.kicad_pcb and its schematic BPi2m-Ethernet/BPi2m-Ethernet.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Wordclock main design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).