HardLabs

Kroneum

azasypkin·kroneum·hw/pcb/Rev_0.6/kroneum.kicad_pcb

Kroneum PCB layout, top view — open source STM32 board by azasypkin
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About the Kroneum PCB

Kroneum is an open source STM32 PCB design by azasypkin, published on GitHub under the MIT license. It is a 2-layer board measuring 30 × 30 mm, with 19 components from 15 distinct parts.

Its main chip is the STM32F042F4Px, from the STM32 family. Other key parts include the MCP1700-3302E_SOT89. By type, the board carries 7 capacitors, 4 switches, 2 ICs, 2 resistors, 1 connector and 1 battery holder.

It belongs with the robotics & motion and iot & wireless designs in this gallery.

From the project

🕒 -.- .-. --- -. . ..- -- Kroneum -.- .-. --- -. . ..- -- 🕒

Disclaimer: I needed a dumb, autonomous, configurable and GUI-less physical timer to better manage my own time during the day and that is how Kroneum was born. Another goal was to see how well Rust fits into embedded development (basic interactions with MCU, USB stack and I2C driver).

Kroneum is an experimental, accessible (no GUI) and fully open source (both in code and hardware) time tracker device.

Kroneum, from the project README
From the project README

Main components on the Kroneum

STM32F042F4PxMCP1700-3302E_SOT89

Kroneum bill of materials (BOM)

19 components, 15 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F042F4Px
U1
1
MCP1700-3302E_SOT89
U2
1
USB_B_Micro
J1
1
Battery
BT1
1
Buzzer
BZ1
1
Boot_Mode_Btn
SW1
1
Ctrl_One_Btn
SW2
1
Reset_Btn
SW3
1
Ctrl_Ten_Btn
SW4
1
BAT54C
D1
4
0.1u
C1, C7, C8, C9
2
1u
C2, C4
1
4.7u
C3
1
470
R1
1
1M
R2

Kroneum design files

The KiCad project lives in the azasypkin/kroneum repository on GitHub; these links point at the commit this page was built from.

Kroneum: common questions

What microcontroller does the Kroneum use?

The Kroneum is built around the STM32F042F4Px, from the STM32 family.

How big is the Kroneum PCB?

The Kroneum measures 30 × 30 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Kroneum?

19 components, from 15 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Kroneum design files?

From the azasypkin/kroneum repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Kroneum design in my own project?

Yes, under the terms of its MIT license, which azasypkin chose for the repository.

Can I test firmware for the Kroneum 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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