HardLabs

SW63 mk4

xx0x·sw63·pcb/sw63_mk4_v2/sw63_mk4_v2.kicad_pcb

SW63 mk4 PCB layout, top view — open source STM32 board by xx0x

About the SW63 mk4 PCB

SW63 mk4 is an open source STM32 PCB design by xx0x, published on GitHub under the MIT license. It is a 4-layer board measuring 34.8 × 35.6 mm, with 64 components from 28 distinct parts.

Its main chip is the STM32L052K8UX, from the STM32 family. Other key parts include the DIO5518BST5, MCP1711T-3.3I/OT, TLC5916IPWR and DS3231MZ. By type, the board carries 22 diodes, 16 resistors, 12 capacitors, 7 ICs, 3 transistors and 2 switches.

It belongs with the wearables designs in this gallery.

From the project

Sci-fi inspired electronic watch. MK4 currently in the development (out in 2026).

When the button is briefly pressed, SW63 tells you the time using a sequence of LED blinks. It's not a binary clock, it's inspired by the analog clock hands movement and uses quarters, halves and so on; similar to how people used to tell the time before the digital clock became popular.

16:35 half past - four - hours - and - five - minutes - PM

6:57 three - minutes - to - whole - seven - hours

Main components on the SW63 mk4

DIO5518BST5MCP1711T-3.3I/OTTLC5916IPWRDS3231MZSTM32L052K8UX

SW63 mk4 bill of materials (BOM)

64 components, 28 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
DIO5518BST5
U1
1
MCP1711T-3.3I/OT
U2
3
TLC5916IPWR
U3, U4, U5
1
DS3231MZ
U6
1
STM32L052K8UX
STM32L052K8Ux
U7
1
DMG2305UX-7
Q1
1
DMG2302U-7
Q2
1
TEMT6200FX01
Q3
1
GT-USB-7070C
J1
1
0603L020/30XR
F1
1
C2798494
KSC321J LFS
SW1
1
C2828254
EVQ-P7J01P
SW2
12
XL-3216UWC
D1, D2, D3, D4, D5, D6, D7, D8 +4
1
L-53SYDK (Yellow)
D13
1
LL-504BD2E-B4-2B (Blue)
D14
1
LL-504PGD2E-G5-2B (Green)
D15
1
LL-503VD2E-V1-4D (Red)
D16
4
LL-234YD2Q-1B (Yellow)
D17, D18, D19, D20
1
FYL-3014LRD1A (Red)
D21
1
MS2A40LWS
D22
Show 8 more
QtyPartRefs
5
10U
10u
C1, C2, C3, C7, C8
7
100N
100n
C4, C5, C6, C9, C10, C11, C12
4
5K1
5k1
R1, R2, R9, R10
4
22K
22k
R3, R14, R15, R16
4
10K
10k
R4, R5, R6, R7
1
2k
R8
2
100K
100k
R11, R12
1
220K
220k
R13

SW63 mk4 design files

The KiCad project lives in the xx0x/sw63 repository on GitHub; these links point at the commit this page was built from.

SW63 mk4: common questions

What microcontroller does the SW63 mk4 use?

The SW63 mk4 is built around the STM32L052K8UX, from the STM32 family.

How big is the SW63 mk4 PCB?

The SW63 mk4 measures 34.8 × 35.6 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the SW63 mk4?

64 components, from 28 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 SW63 mk4 design files?

From the xx0x/sw63 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 SW63 mk4 design in my own project?

Yes, under the terms of its MIT license, which xx0x chose for the repository.

Can I test firmware for the SW63 mk4 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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