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4x3 derived

valerietsoi·4x3_derived·pcb files/4x3_derived.kicad_pcb

4x3 derived PCB layout, top view — open source STM32 board by valerietsoi
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About the 4x3 derived PCB

4x3 derived is an open source STM32 PCB design by valerietsoi, published on GitHub. It is a 2-layer board measuring 75 × 57.2 mm, with 47 components from 15 distinct parts.

Its main chip is the STM32F072CBT6, from the STM32 family. Other key parts include the PRTR5V0U2X and XC6206PXXXMR-REGULATOR_LINEAR. By type, the board carries 13 switches, 12 diodes, 10 capacitors, 4 resistors, 3 ICs and 3 connectors.

It belongs with the keyboards designs in this gallery.

From the project

a macropad with 4x3=12 keys. integrated pcb powered by stm32f072cbt6.

Derived, as in derived from the previous 2x2 macropad.

Use QMK toolbox to flash the pre-compiled .bin. Source files to be uploaded.

4x3 derived, from the project README
From the project README

Main components on the 4x3 derived

STM32F072CBT6PRTR5V0U2XXC6206PXXXMR-REGULATOR_LINEAR

4x3 derived bill of materials (BOM)

47 components, 15 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F072CBT6
U1
1
PRTR5V0U2X
U2
1
XC6206PXXXMR-REGULATOR_LINEAR
XC6206PxxxMR-Regulator_Linear
U3
1
USB_C_RECEPTACLE_USB2.0
USB_C_Receptacle_USB2.0
J1
1
Conn_01x02_Socket
J5
1
CONN_01X02_SOCKET
Conn_01x02_Socket
J6
1
C318884
SW_SPST
BOOT1
1
500MA
500mA
F1
12
Keyswitch
S1, S2, S3, S4, S5, S6, S7, S8 +4
1
Keyswitch
S13
12
C81598
Diode
D1, D2, D3, D4, D5, D6, D7, D8 +4
7
100NF
100nF
C1, C3, C5, C6, C8, C9, C10
1
10UF
10uF
C2
2
1UF
1uF
C4, C7
4
5.1K
5.1k
R1, R2, R3, R4

4x3 derived design files

The KiCad project lives in the valerietsoi/4x3_derived repository on GitHub; these links point at the commit this page was built from.

4x3 derived: common questions

What microcontroller does the 4x3 derived use?

The 4x3 derived is built around the STM32F072CBT6, from the STM32 family.

How big is the 4x3 derived PCB?

The 4x3 derived measures 75 × 57.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 4x3 derived?

47 components, from 15 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 4x3 derived design files?

From the valerietsoi/4x3_derived 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 4x3 derived design in my own project?

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

Can I test firmware for the 4x3 derived 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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