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OSBAMS

hle12345·OSBAMS·legacy/reference/rev1_kicad/OSBAMS PCB.kicad_pcb

OSBAMS PCB layout, top view — open source STM32 board by hle12345

About the OSBAMS PCB

OSBAMS is an open source STM32 PCB design by hle12345, published on GitHub under the MIT license. It is a 2-layer board measuring 80 × 80 mm, with 16 components from 16 distinct parts.

Its main chip is the STM32L476RGT6, from the STM32 family. By type, the board carries 6 connectors, 3 diodes, 3 capacitors, 2 resistors, 1 IC and 1 transistor.

From the project

Moved here on 2026-10-01. The Rev.1 80x80 mm carrier PCB is a proven-prototype reference (circuits and interfaces that worked), not a design to revise or manufacture. It carries a known diode-polarity defect (symbol pin 1 = anode vs footprint pad 1 = cathode on D1-D3) and no PA0/

Moved here on 2026-10-01. The Rev.1 80x80 mm carrier PCB is a proven-prototype reference (circuits and interfaces that worked), not a design to revise or manufacture. It carries a known diode-polarity defect (symbol pin 1 = anode vs footprint pad 1 = cathode on D1-D3) and no PA0/PA1/PC9 circuits. The Rev.2 controller is a new design in Hardware/Rev2Controller/. rootduplicateproject/ holds the second, smaller .kicadpro/.kicadprl that used to sit in the repo root. tools/mfg` still reads these files only for the regression tests that reproduce the Rev.1 defect.

Main components on the OSBAMS

STM32L476RGT6

OSBAMS bill of materials (BOM)

16 components, 16 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32L476RGT6
TC74A5-3.3VAT
STMicroelectronics
U1
1
IRLML0060TRPBF
IRLZ44NPBF
Infineon
Q1
1
EB21A-02-C
PWR_IN_12V
Adam Tech
J1
1
EB21A-02-C
CONTACTOR_COIL
Adam Tech
J2
1
EB21A-02-C
ESTOP_LOOP
Adam Tech
J3
1
EB21A-02-C
INA228_MODULE
Adam Tech
J4
1
22-27-2031
NUCLEO_INTERFACE
Molex
J5
1
22-27-2041
UART_HDR
Molex
J6
1
SMBJ15A
SMBJ15A (confirmed, DO-214AA/SMB)
Littelfuse
D1
1
SS14-E3/61T
1N5408 (flyback)
Vishay
D2
1
150080GS75000
SB560-E3/73 (rev-polarity, Schottky)
Wurth Elektronik
D3
1
GRM32ER71H106KA12L
ECA-1EM100I: 10uF 25V (+12V/GND)
Murata
C1
1
GRM32ER71H106KA12L
0.1uF (TC74 bypass)
Murata
C2
1
GRM188R71H104KA93D
0.1uF (logic bypass)
Murata
C3
1
CRCW060333K2FKEA
220 (gate)
Vishay Dale
R1
1
CRCW060310K0FKEA
10k (gate pulldown)
Vishay Dale
R2

OSBAMS design files

The KiCad project lives in the hle12345/OSBAMS repository on GitHub; these links point at the commit this page was built from.

OSBAMS: common questions

What microcontroller does the OSBAMS use?

The OSBAMS is built around the STM32L476RGT6, from the STM32 family.

How big is the OSBAMS PCB?

The OSBAMS measures 80 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the OSBAMS?

16 components, from 16 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 OSBAMS design files?

From the hle12345/OSBAMS 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 OSBAMS design in my own project?

Yes, under the terms of its MIT license, which hle12345 chose for the repository.

Can I test firmware for the OSBAMS 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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