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Bonsai C4

customMK·Bonsai-C·C4 extended/Bonsai_C4.kicad_pcb

Bonsai C4 PCB layout, top view — open source STM32 board by customMK
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About the Bonsai C4 PCB

Bonsai C4 is an open source STM32 PCB design by customMK, published on GitHub under the CERN-OHL-P-2.0 license. It is a 4-layer board measuring 17.8 × 51.6 mm, with 48 components from 32 distinct parts.

Its main chip is the STM32F411CEU6, from the STM32 family. Other key parts include the AAP2967-33VIR1, SRV05-4, SN74LV1T34DCKR, W25Q128JVSIQ and MB85RS64PNF-G-JNERE1. By type, the board carries 14 capacitors, 9 resistors, 7 ICs, 7 connectors, 5 diodes and 2 transistors.

It belongs with the keyboards designs in this gallery.

From the project

An open-source ARM-based microcontroller board

Brought to you by customMK, Bonsai C4 Extended Edition is an open source microcontroller board featuring an STM32F411CEU6 microcontroller. It is designed to be a drop-in-replacement for Proton C rev 2 and Pro Micro.

For a more compact version of Bonsai C4 that matches the length of a Pro Micro (for physical backwards compatibility reasons), please see Bonsai C4 Compact Edition found here

Bonsai C4, from the project README
From the project README

Main components on the Bonsai C4

AAP2967-33VIR1SRV05-4STM32F411CEU6SN74LV1T34DCKRW25Q128JVSIQMB85RS64PNF-G-JNERE1

Bonsai C4 bill of materials (BOM)

48 components, 32 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AAP2967-33VIR1
U1
1
SRV05-4
U2
1
STM32F411CEU6
U3
2
SN74LV1T34DCKR
U4, U5
1
W25Q128JVSIQ
U6
1
MB85RS64PNF-G-JNERE1
U7
2
MUN5311DW1T1G
Q1, Q2
1
X50328MSB2GI
SMD-CRYSTAL-8MHZ-20PF-10PPM_2P-5.0X3.2MM_
Y1
1
HEADER-VERT_3P-2.54_
J1
1
HEADER-VERT_1P-2.54_
J2
1
TYPE-C-31-M-12
TYPE-C-31-M12_13
J3
2
HEADER-VERT_12P-2.54_
J4, J5
2
HEADER-VERT_6P-2.54_
J6, J7
1
SMD0805-050
SMD-PPTC-500MA_0805_
F1
1
EVPAF7B70
SMD-SWITCH-TACTILE-SPST-NO_4P-3.0MMx2.6MM_
K1
2
PMEG2010AEB
D1, D5
1
1N4148X-TP
1N4148
D2
1
16-219A/T2D-AR2T1QY/3T
SMD-LED-WHITE_0402_
D3
1
SMF5.0A
D4
1
CBG100505U260T
fb_0402_26ohm
FB1
Show 12 more
QtyPartRefs
5
cap_100nF_16v_0402
C1, C2, C3, C4, C5
2
CL05A475MP5NRNC
cap_4.7uF_10v_0402
C6, C14
2
CL05B104KO5NNNC
cap_100nF_16v_0402
C7, C13
2
0402CG200J500NT
cap_20pF_50v_0402
C8, C9
2
CC0402KRX5R6BB105
cap_1uF_10v_0402
C10, C11
1
CL10A106KP8NNNC
cap_10uF_10v_0402
C12
2
0402WGF1003TCE
r_100k_0402_1p
R1, R8
2
0402WGF5101TCE
r_5.1k_0402_1p
R2, R3
2
0402WGF750JTCE
r_75_0402_1p
R4, R7
1
0402WGF4701TCE
r_4.7k_0402_1p
R5
1
0402WGF1002TCE
r_10k_0402_1p
R6
1
0402WGF4700TCE
r_470_0402_1p
R9

Bonsai C4 design files

The KiCad project lives in the customMK/Bonsai-C repository on GitHub; these links point at the commit this page was built from.

Bonsai C4: common questions

What microcontroller does the Bonsai C4 use?

The Bonsai C4 is built around the STM32F411CEU6, from the STM32 family.

How big is the Bonsai C4 PCB?

The Bonsai C4 measures 17.8 × 51.6 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Bonsai C4?

48 components, from 32 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 Bonsai C4 design files?

From the customMK/Bonsai-C repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Bonsai C4 design in my own project?

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

Can I test firmware for the Bonsai C4 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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