HardLabs

Kb45p

flabbergast·kicad·kb45p/kb45p.kicad_pcb

Kb45p PCB layout, top view — open source STM32 board by flabbergast

About the Kb45p PCB

Kb45p is an open source STM32 PCB design by flabbergast, published on GitHub under the BSD-3-Clause license. It is a 2-layer board measuring 245.3 × 75.6 mm, with 101 components from 14 distinct parts.

Its main chip is the STM32F042, from the STM32 family. Other key parts include the MCP1703T_3LEAD. By type, the board carries 34 switches, 33 diodes, 4 capacitors, 2 ICs, 2 connectors and 2 resistors.

It belongs with the keyboards designs in this gallery.

From the project

flabbergast's kicad files

This is a PCB for a 45% keyboard. Supports ALPS and Cherry MX switches. No LEDs, only one SMT LED on the front bottom side. The supported layouts are this and this.

The controller MCU is STM32F042K6T7 - 32kB flash, 6kB RAM, DFU bootloader in ROM, LQFP-32 package. The BOOT0 pin for entering the bootloader on power up is brought out to a pushbutton on the bottom side of the PCB.

Main components on the Kb45p

STM32F042MCP1703T_3LEAD

Kb45p bill of materials (BOM)

101 components, 14 distinct parts.

QtyPartRefs
1
STM32F042
IC1
1
MCP1703T_3LEAD
IC2
1
DEBUG_CON
CON1
1
USB_mini_micro_B
J1
12
DIODE
DA1, DA2, DA3, DA4, DB1, DB2, DB3, DB4 +4
1
BOOT0_BTN
S1
33
SW
S11, S12, S13, S21, S22, S23, S24, S31 +25
12
SW
SA1, SA2, SA3, SA4, SB1, SB2, SB3, SB4 +4
1
LED
D1
32
DIODE
D11, D12, D13, D21, D22, D23, D24, D31 +24
2
0.1uF
C1, C2
2
2.2uF
C3, C4
1
10kR
R1
1
1kR
R2

Kb45p design files

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

Kb45p: common questions

What microcontroller does the Kb45p use?

The Kb45p is built around the STM32F042, from the STM32 family.

How big is the Kb45p PCB?

The Kb45p measures 245.3 × 75.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Kb45p?

101 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the Kb45p design files?

From the flabbergast/kicad repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Kb45p design in my own project?

Yes, under the terms of its BSD-3-Clause license, which flabbergast chose for the repository.

Can I test firmware for the Kb45p 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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