HardLabs

Knuckle

HeyPCB·knuckle·kicad/knuckle.kicad_pcb

Knuckle PCB layout, top view — open source STM32 board by HeyPCB

About the Knuckle PCB

Knuckle is an open source STM32 PCB design by HeyPCB, published on GitHub under the CERN-OHL-S-2.0 license. It is a 6-layer board measuring 35 × 35 mm, with 44 components from 25 distinct parts.

Its main chip is the STM32G431KBU6, from the STM32 family. Other key parts include the DRV8311HRRWR, MT6701QT-STD, SN74LVC1G126DBVR and SN74LVC1G125DBVR. By type, the board carries 17 capacitors, 13 resistors, 5 ICs, 4 diodes, 3 connectors and 1 transistor.

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

From the project

35 mm round FOC driver for a GBM2804 gimbal motor that answers on the Open Duck Mini's servo bus as an STS3215. 6-layer KiCad 10 board plus printed standoff, cover and horn adapter.

A 35 mm round FOC driver that bolts to a GBM2804 gimbal motor and answers on the Open Duck Mini's servo bus as an STS3215.

Part of HeyPCB's open robot boards. Designed end to end with the HeyPCB method on KiCad 10 (headless pipeline, Freerouting 2.4.1); every number below is measured on the files in this repository. Mentions of ./run.sh, docs/rules/, blocks/ or parts/ refer to the heypcb-kicad SDK that produced them.

Knuckle, from the project README
From the project README

Main components on the Knuckle

STM32G431KBU6DRV8311HRRWRMT6701QT-STDSN74LVC1G126DBVRSN74LVC1G125DBVR

Knuckle bill of materials (BOM)

44 components, 25 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32G431KBU6
U1
1
DRV8311HRRWR
DRV8311H
U2
1
MT6701QT-STD
MT6701QT
U3
1
SN74LVC1G126DBVR
74LVC1G126
U4
1
SN74LVC1G125DBVR
74LVC1G125
U5
1
AO3401A
Q1
2
0022035035
5267-03A
J1, J2
1
MOTOR
J4
1
NCP15XH103F03RC
10k B3380
TH1
1
MM5Z5V1T1G
5.1V
D1
1
TPESD9B5.0ST5G
ESD 5V
D2
1
SMAJ12A
D3
1
KT-0603R
Red (STAT)
D4
10
CL05B104KO5NNNC
100nF
C1, C2, C3, C5, C10, C12, C13, C14 +2
1
CL05A105KA5NQNC
1uF
C4
2
CL05B104KB54PNC
100nF 50V
C6, C8
2
CL10A106MA8NRNC
10uF 25V
C7, C9
1
CL05A225MQ5NSNC
2.2uF
C11
1
T521B226M025ATE100
22uF 25V polymer
C16
5
0402WGF1002TCE
10k
R1, R6, R7, R9, R12
Show 5 more
QtyPartRefs
4
0402WGF1003TCE
100k
R2, R4, R8, R10
1
0402WGF5101TCE
5.1k
R3
1
0402WGF1000TCE
100
R5
1
0402WGF2202TCE
22k
R11
1
0603WAF1001T5E
1k
R13

Knuckle design files

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

Knuckle: common questions

What microcontroller does the Knuckle use?

The Knuckle is built around the STM32G431KBU6, from the STM32 family.

How big is the Knuckle PCB?

The Knuckle measures 35 × 35 mm, has 6 copper layers and is 1.6 mm thick.

How many components are on the Knuckle?

44 components, from 25 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 Knuckle design files?

From the HeyPCB/knuckle 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 Knuckle design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which HeyPCB chose for the repository.

Can I test firmware for the Knuckle 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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