Wordclock proto r1
About the Wordclock proto r1 PCB
Wordclock proto r1 is an open source STM32 PCB design by evanparizot, published on GitHub. It is a 4-layer board measuring 160 × 160 mm, with 113 components from 41 distinct parts.
Its main chip is the STM32F303RCTx, from the STM32 family. Other key parts include the MAX7219, DS3231MZ and AT24CS02-SSHM. By type, the board carries 66 diodes, 19 capacitors, 13 resistors, 5 ICs, 3 inductors and 2 crystals.
From the project
PCB schematics, code, and graphics for a custom wordclock.
This project is not a word clock based on the wikipedia definition, but rather just an aesthetic choice of representing time. Rather than showing something like a clock face or time in 12 hour / 24 hour format, a wordclock spells out the time using words. One of the more well known examples of wordclocks being produced is from the company QLOCKTWO. Unfortunately, at it's retail price of $1,500+, they can be pretty expensive.
Main components on the Wordclock proto r1
Wordclock proto r1 bill of materials (BOM)
113 components, 41 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MAX7219 | SOIC-24W_7.5x15.4mm_P1.27mm | U1 |
| 1 | STM32F303RCTx | LQFP-64_10x10mm_P0.5mm | U5 |
| 1 | ~ | SOT-23-6 | U7 |
| 1 | DS3231MZ | SOIC-8_3.9x4.9mm_P1.27mm | U8 |
| 1 | AT24CS02-SSHM | SOIC-8_3.9x4.9mm_P1.27mm | U9 |
| 1 | AO3401A | SOT-23 | Q1 |
| 1 | 8MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 32.768kHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y2 |
| 1 | USB_C_Plug | USB_C_Receptacle_GCT_USB4115-03-C | P1 |
| 1 | Battery_Cell | BatteryHolder_Keystone_3002_1x2032 | BT1 |
| 1 | 1A | Fuse_1206_3216Metric | F1 |
| 1 | SW_SPDT | SW_SPDT_PCM12 | SW1 |
| 64 | LED | LED_2010_5025Metric_Pad1.52x2.65mm_HandSolder | D1, D2, D3, D4, D5, D6, D7, D8 +56 |
| 1 | Status | LED_0603_1608Metric | D500 |
| 1 | SHCK | D_SOD-123 | D501 |
| 1 | 600 @ 600MHz | L_0805_2012Metric | FB1 |
| 1 | 39nH | L_Sunlord_MWSA0518S | L1 |
| 1 | 3.3uH | L_0402_1005Metric | L2 |
| 1 | 4.7uF | C_0603_1608Metric | C1 |
| 2 | 20pF | C_0402_1005Metric | C2, C9 |
Show 21 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 12pF | C_0402_1005Metric | C3, C8 |
| 2 | 1uF | C_0402_1005Metric | C4, C14 |
| 5 | 100nF | C_0402_1005Metric | C5, C7, C10, C11, C12 |
| 1 | 10nF | C_0402_1005Metric | C6 |
| 1 | 10uF | C_0805_2012Metric | C13 |
| 1 | 0.1uF | C_0402_1005Metric | C15 |
| 1 | 10nF | C_0603_1608Metric | C16 |
| 1 | ? | C_0603_1608Metric | C17 |
| 1 | 68uF | C_0603_1608Metric | C18 |
| 1 | 0.1uF | C_0805_2012Metric | C19 |
| 1 | 10k | R_0603_1608Metric | R1 |
| 1 | 47Ω | R_0402_1005Metric | R2 |
| 1 | 242k | R_0402_1005Metric | R3 |
| 1 | 1k5 | R_0402_1005Metric | R4 |
| 1 | 100k | R_0805_2012Metric | R5 |
| 1 | 68k | R_0805_2012Metric | R6 |
| 2 | 4.7k | R_0402_1005Metric | R7, R8 |
| 1 | 31.25k | R_0805_2012Metric | R9 |
| 1 | 10k | R_0805_2012Metric | R10 |
| 2 | 22 | R_0603_1608Metric | R11, R12 |
| 1 | 9.53k | R_0805_2012Metric | R13 |
Wordclock proto r1 design files
The KiCad project lives in the evanparizot/wordclock repository on GitHub; these links point at the commit this page was built from.
Wordclock proto r1: common questions
What microcontroller does the Wordclock proto r1 use?
The Wordclock proto r1 is built around the STM32F303RCTx, from the STM32 family.
How big is the Wordclock proto r1 PCB?
The Wordclock proto r1 measures 160 × 160 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Wordclock proto r1?
113 components, from 41 distinct parts. The full bill of materials is listed on this page.
Where can I download the Wordclock proto r1 design files?
From the evanparizot/wordclock repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Wordclock proto r1 design in my own project?
The repository has no license, so all rights stay with evanparizot. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Wordclock proto r1 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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