HardLabs

Axon

paulodietricheng·Axon

Axon PCB layout, top view — open source STM32 board by paulodietricheng
Simulate this board

About the Axon PCB

Axon is an open source STM32 PCB design by paulodietricheng, published on GitHub. It is a 4-layer board measuring 43.9 × 55.6 mm, with 67 components from 30 distinct parts.

Its main chip is the STM32G431CBTx, from the STM32 family. Other key parts include the INA333xxDGK, OPA333xxDCK, TPS7A2033PDBVR, TPS60403DBVR and ADS131M02IPWR. By type, the board carries 31 capacitors, 18 resistors, 9 ICs, 4 diodes, 3 connectors and 1 crystal.

From the project

Electromyography (EMG) signal processing device with an analog front end for amplification and filtering, analog-to-digital conversion, and STM32 firmware for real-time processing and actuation of external devices.

Axon is a single-channel mixed-signal Electromyography (EMG) acquisition and actuation system built around a custom PCB. It combines a low-noise analog front end, delta-sigma analog-to-digital conversion, and STM32 firmware for real-time signal acquisition and control of external devices.

The project emphasizes signal integrity, deterministic signal paths, and hardware/firmware co-design in a timing-constrained embedded system.

Main components on the Axon

INA333xxDGKOPA333xxDCKTPS7A2033PDBVRTPS60403DBVRADS131M02IPWRSTM32G431CBTxARM-JTAG-SWD

Axon bill of materials (BOM)

67 components, 30 distinct parts.

QtyPartRefs
1
INA333xxDGK
U1
3
OPA333xxDCK
U2, U3, U5
1
TPS7A2033PDBVR
U6
1
TPS60403DBVR
U7
1
ADS131M02IPWR
U8
1
STM32G431CBTx
U11
1
ARM-JTAG-SWD
U12
1
ASE-8192MHz
Y1
1
USB_C_Receptacle_Palconn_UTC16-G
J1
1
Conn_01x02_Pin
J2
1
Conn_02x03_Top_Bottom
J3
1
MF-MSMF050-2
F1
4
D_Schottky_Small_Filled
D1, D2, D3, D4
16
0.1uF
C1, C3, C5, C6, C8, C9, C10, C12 +8
8
10uF
C2, C4, C27, C28, C29, C30, C31, C32
1
220uF
C40
5
100nF
C42, C44, C45, C46, C48
1
1uF
C47
1
150K
R1
1
75K
R2
Show 10 more
QtyPartRefs
3
100
R3, R4, R13
1
2K
R5
2
100K
R6, R7
1
1.37K
R8
1
9.11K
R9
2
1K
R10, R20
2
5.1K
R11, R12
1
40K
R18
2
10K
R19, R21
1
10
R22

Axon design files

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

Axon: common questions

What microcontroller does the Axon use?

The Axon is built around the STM32G431CBTx, from the STM32 family.

How big is the Axon PCB?

The Axon measures 43.9 × 55.6 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Axon?

67 components, from 30 distinct parts. The full bill of materials is listed on this page.

Where can I download the Axon design files?

From the paulodietricheng/Axon repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Axon design in my own project?

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

Can I test firmware for the Axon 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.

Similar boards