HardLabs

Wallet dmm

ArgonautGit·wallet_dmm·hardware/wallet_dmm.kicad_pcb

Wallet dmm PCB layout, top view — open source STM32 board by ArgonautGit

About the Wallet dmm PCB

Wallet dmm is an open source STM32 PCB design by ArgonautGit, published on GitHub. It is a 2-layer board measuring 85.6 × 54 mm, with 61 components from 38 distinct parts.

Its main chip is the STM32L051K8T6, from the STM32 family. Other key parts include the MCP73831T-2ACI/OT, XC6206P302MR-G and TL431AIDBZR. By type, the board carries 30 resistors, 14 capacitors, 5 switches, 4 ICs, 4 diodes and 2 transistors.

It belongs with the power & battery and test & measurement designs in this gallery.

From the project

A multimeter the size of a credit card: DC volts, resistance, continuity and diode test, shown on a 0.91" OLED, with three buttons, an RGB LED and a piezo beeper. It runs from a small LiPo that charges over USB-C and is built around an STM32L051K8, with Rust firmware and a simula

A multimeter the size of a credit card: DC volts, resistance, continuity and diode test, shown on a 0.91" OLED, with three buttons, an RGB LED and a piezo beeper. It runs from a small LiPo that charges over USB-C and is built around an STM32L051K8, with Rust firmware and a simulation of the whole thing.

This is revision 3. Rev 1 (the October 2024 JLCPCB order) is commit a01ea68; rev 2 is the v2 branch.

Wallet dmm, from the project README
From the project README

Main components on the Wallet dmm

STM32L051K8T6MCP73831T-2ACI/OTXC6206P302MR-GTL431AIDBZR

Wallet dmm bill of materials (BOM)

61 components, 38 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32L051K8T6
STMicroelectronics
U1
1
MCP73831T-2ACI/OT
Microchip
U2
1
XC6206P302MR-G
XC6206P302MR (3.0 V)
Torex
U3
1
TL431AIDBZR
Texas Instruments
U4
1
AO3401A
Alpha & Omega
Q1
1
2N7002
Jiangsu Changjing
Q2
1
TYPE-C-31-M-12
USB-C (charge only)
Korean Hroparts Elec
J1
1
PKLCS1212E4001-R1
PKLCS1212E4001
Murata
BZ1
1
TS-1187A-B-A-B
BUTTON A
XKB Connection
SW1
1
TS-1187A-B-A-B
BUTTON B
XKB Connection
SW2
1
TS-1187A-B-A-B
BUTTON C
XKB Connection
SW3
1
TS-1187A-B-A-B
RESET
XKB Connection
SW4
1
MSK12C02
POWER
SHOU HAN
SW5
1
KT-0603R
CHG red
Hubei KENTO
D1
2
BAV199,215
BAV199
Nexperia
D2, D3
1
TJ-S1615CY6TGLCCYRGB-A5
RGB
TOGIALED
D4
2
CL10A475KO8NNNC
4.7uF
Samsung Electro-Mechanics
C1, C2
4
CL10A105KB8NNNC
1uF
Samsung Electro-Mechanics
C3, C8, C12, C14
1
CL10A106KP8NNNC
10uF
Samsung Electro-Mechanics
C4
4
CC0603KRX7R9BB104
100nF
YAGEO
C5, C6, C7, C10
Show 18 more
QtyPartRefs
1
0603B103K500NT
10nF
Fenghua
C9
1
CL10B473KB8NNNC
47nF
Samsung Electro-Mechanics
C11
1
CL10B223KB8NNNC
22nF
Samsung Electro-Mechanics
C13
3
0603WAF5101T5E
5.1k
UNI-ROYAL
R1, R2, R14
4
0603WAF1002T5E
10k
UNI-ROYAL
R3, R5, R9, R18
5
0603WAF1001T5E
1k
UNI-ROYAL
R4, R15, R16, R19, R25
1
0603WAF1502T5E
15k
UNI-ROYAL
R6
4
0603WAF1004T5E
1M
UNI-ROYAL
R7, R8, R20, R30
2
1206W4F4704T5E
4.7M
UNI-ROYAL
R10, R11
1
0603WAF4703T5E
470k
UNI-ROYAL
R12
1
0603WAF4701T5E
4.7k
UNI-ROYAL
R13
1
RT1206BRD0710KL
10k 0.1%
YAGEO
R17
1
0603WAF4702T5E
47k
UNI-ROYAL
R21
2
0603WAF1003T5E
100k
UNI-ROYAL
R22, R23
1
0603WAF6800T5E
680
UNI-ROYAL
R24
1
0603WAF3300T5E
330
UNI-ROYAL
R26
2
0603WAF2200T5E
220
UNI-ROYAL
R27, R28
1
0603WAF3303T5E
330k
UNI-ROYAL
R29

Wallet dmm design files

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

Wallet dmm: common questions

What microcontroller does the Wallet dmm use?

The Wallet dmm is built around the STM32L051K8T6, from the STM32 family.

How big is the Wallet dmm PCB?

The Wallet dmm measures 85.6 × 54 mm, has 2 copper layers and is 0.8 mm thick.

How many components are on the Wallet dmm?

61 components, from 38 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 Wallet dmm design files?

From the ArgonautGit/wallet_dmm 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 Wallet dmm design in my own project?

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

Can I test firmware for the Wallet dmm 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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