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Counter thing

SyntaxColoring·counter-thing·pcb/Counter thing.kicad_pcb

Counter thing PCB layout, top view — open source STM32 board by SyntaxColoring
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About the Counter thing PCB

Counter thing is an open source STM32 PCB design by SyntaxColoring, published on GitHub. It is a 2-layer board measuring 61 × 34 mm, with 13 components from 10 distinct parts.

Its main chip is the STM32L010K4T6, from the STM32 family. By type, the board carries 7 capacitors, 1 IC, 1 connector, 1 battery holder and 1 switch.

From the project

A thing that counts.

The Counter Thing is a hardware device with a button and numeric display. It currently counts days going up, and resets to 0 when you press the button.

I should run ~1 year on a CR2032 battery and keep time with a drift of <15 minutes/year.

I use a few as household reminders, like keeping track of how many days it's been since I've last vacuumed or watered my plants.

Counter thing, from the project README
From the project README

Main components on the Counter thing

STM32L010K4T6

Counter thing bill of materials (BOM)

13 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32L010K4T6
U1
1
FTSH-105-01-L-DV-007-K
J1
1
BA2032SM
BT1
1
LCD-A2X1C50TR
DS1
1
B3FS-1015
SW1
1
ECS-327KE-TR
XO1
1
C0805C106K8PAC7800
10u
C1
4
C0805C104K5RAC7210
100n
C2, C3, C5, C7
1
C0805C105K4RAC7800
1u
C4
1
C0805C103K1RAC7800
10n
C6

Counter thing design files

The KiCad project lives in the SyntaxColoring/counter-thing repository on GitHub; these links point at the commit this page was built from.

Counter thing: common questions

What microcontroller does the Counter thing use?

The Counter thing is built around the STM32L010K4T6, from the STM32 family.

How big is the Counter thing PCB?

The Counter thing measures 61 × 34 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Counter thing?

13 components, from 10 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 Counter thing design files?

From the SyntaxColoring/counter-thing repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Counter thing design in my own project?

The repository has no license, so all rights stay with SyntaxColoring. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Counter thing 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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