2 layers200 × 200 mm
2 layers50 × 50 mm
WordClock
casartar/wordclock- Size
- 50 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 39
- Nets
- 28
- Pads
- 154
- Tracks, vias
- 238, 20
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 6 Jan 2025
- Updated
- 23 Nov 2025
Overview
WordClock is an open-source printed circuit board by casartar, from the casartar/wordclock repository on GitHub. It is a 2-layer board of 50 × 50 mm with 39 parts on 28 nets, routed with 238 tracks and 20 vias.
It is built around the STM32F072CBT6 and 74HCT1G08GW-Q100,1. Its parts include 14 capacitors, 9 resistors, 6 connectors, 3 ICs and 2 diodes. It belongs with the STM32 boards of this library.
Main components
2
STM32F072CBT6
LQFP-48(7x7)-40℃~+85℃ 1.65V~3.6V 128KB 12bit 12bit 16KB 32 Bit 37 48MHz ARM Cortex-M0 Built-in FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
74HCT1G08GW-Q100,1
TSSOP-5-1.3mm-40℃~+125℃ 1 100mV、330mV 11ns@4.5V,50pF 2 20uA 2V 2mA 2mA 4.13V~4.32V、4.4V~4.5V 4.5V~5.5V 74HCT 800mV AND Gate TSSOP-5-1.3mm Logic Gates ROHSNexperiaLogic Gates
Parts
39| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100n | Capacitors_SMD:C_0805_HandSoldering | C1, C4, C7, C8, C9, C10, C11, C14 |
| 3 | 10k | Resistors_SMD:R_0805_HandSoldering | R1, R4, R5 |
| 2 | 100u | Capacitors_SMD:c_elec_6.3x5.7 | C13, C15 |
| 2 | 16p | Capacitors_SMD:C_0603_HandSoldering | C5, C6 |
| 2 | 1k | Resistors_SMD:R_0805_HandSoldering | R6, R7 |
| 2 | 1u | Capacitors_SMD:C_0805_HandSoldering | C2, C3 |
| 2 | 27 | Resistors_SMD:R_0805_HandSoldering | R2, R3 |
| 2 | Jumper_NO_Small | Footprints:PIN_HEADER_01x02 | JP1, JP2 |
| 2 | LED | LEDs:LED_0805 | D1, D2 |
| 2 | SW_PUSH | Footprints:Kurzhubtaster_SMD | SW1, SW2 |
| 1 | 15k | Resistors_SMD:R_0805_HandSoldering | R8 |
| 1 | 22k | Resistors_SMD:R_0805_HandSoldering | R9 |
| 1 | 74HCT1G08GW-Q100 | Footprints:SOT353-1 | U3 |
| 1 | CONN_01X02 | Footprints:CONN_RM5,08_2PIN | P1 |
| 1 | CONN_01X03 | Footprints:CONN_RM5,08_3PIN | P4 |
| 1 | CONN_01X04 | Footprints:PIN_HEADER_01x04 | P5 |
| 1 | CONN_01X05 | Footprints:PIN_HEADER_01x05 | P2 |
| 1 | CONN_02X04 | Footprints:PIN_HEADER_02x04 | P3 |
| 1 | Crystal_Small | Footprints:Quarz_SMD | Y1 |
| 1 | MCP1825S | TO_SOT_Packages_SMD:SOT-223 | U1 |
| 1 | STM32F072CB | Footprints:LQFP48 | U2 |
| 1 | USB_OTG | Footprints:MINI USB 2.0 SMD | P6 |
Questions
How big is the WordClock PCB?
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the WordClock use?
39 parts, built around the STM32F072CBT6 and 74HCT1G08GW-Q100,1. 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 KiCad files?
From the casartar/wordclock repository on GitHub, at the commit this page was made from: the board is Hardware/Controller/V01/WordClock.kicad_pcb and its schematic Hardware/LED-PCB/LED-PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the WordClock design in my own project?
Its repository states no licence, so its author keeps all rights: ask casartar before reusing the design.
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