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BM42

str-dst·BM42·pcb/bm42.kicad_pcb

BM42 PCB layout, top view — open source AVR/Arduino board by str-dst
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About the BM42 PCB

BM42 is an open source AVR/Arduino PCB design by str-dst, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 228 × 78 mm, with 93 components from 21 distinct parts.

Its main chip is the ATMEGA32U2-A, from the AVR/Arduino family. Other key parts include the SRV05-4. By type, the board carries 54 LEDs, 22 diodes, 6 capacitors, 6 resistors, 2 ICs and 1 crystal.

From the project

Simple drop-in replacement PCB for the KPR BM43

This work is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License][cc-by-nc-sa].

[cc-by-nc-sa]: http://creativecommons.org/licenses/by-nc-sa/4.0/ [cc-by-nc-sa-image]: https://licensebuttons.net/l/by-nc-sa/4.0/88x31.png [cc-by-nc-sa-shield]: https://img.shields.io/badge/License-CC%20BY--NC--SA%204.0-lightgrey.svg

BM42, from the project README
From the project README

Main components on the BM42

ATMEGA32U2-ASRV05-4

BM42 bill of materials (BOM)

93 components, 21 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA32U2-A
ATmega32U2-A
U1
1
SRV05-4
U2
1
CRYSTAL_GND24_SMALL
Crystal_GND24_Small
X1
1
C69688
Polyfuse_Small
F1
1
USB_C_RECEPTACLE_USB2.0
USB_C_Receptacle_USB2.0
USB1
36
MX-NoLED
MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8 +28
8
MX-NoLED
MX12, MX33, MX34, MX36, MX40, MX42, MX49, MX53
2
MX-NoLED
MX22, MX23
1
MX-NoLED
MX37
1
MX-NoLED
MX39
2
MX-NoLED
MX44, MX47
2
MX-NoLED
MX45, MX46
2
MX-NoLED
MX48, MX55
22
C68978
D_Small
D1, D2, D3, D4, D5, D6, D8, D9 +14
1
10UF
10uF
C1
2
0.1UF
0.1uF
C2, C3
2
22PF
22pF
C4, C5
1
1UF
1uF
C6
2
5.1K
5.1k
R1, R2
2
22
R3, R4
Show 1 more
QtyPartRefs
2
10K
10k
R5, R6

BM42 design files

The KiCad project lives in the str-dst/BM42 repository on GitHub; these links point at the commit this page was built from.

BM42: common questions

What microcontroller does the BM42 use?

The BM42 is built around the ATMEGA32U2-A, from the AVR/Arduino family.

How big is the BM42 PCB?

The BM42 measures 228 × 78 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the BM42?

93 components, from 21 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 BM42 design files?

From the str-dst/BM42 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 BM42 design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the BM42 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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