HardLabs

Grabert

hsaito18·mini-keyboard·grabert-hardware-main/PCB/grabert.kicad_pcb

Grabert PCB layout, top view — open source STM32 board by hsaito18

About the Grabert PCB

Grabert is an open source STM32 PCB design by hsaito18, published on GitHub. It is a 2-layer board measuring 285.8 × 120.7 mm, with 78 components from 27 distinct parts.

Its main chip is the C44854, from the STM32 family. Other key parts include the C85364. By type, the board carries 59 switches, 7 capacitors, 6 connectors, 4 resistors and 2 ICs.

It belongs with the keyboards and displays & leds designs in this gallery.

From the project

Building a 4x4 macro keyboard using left-over Cherry MX Red key switches and left-over keycaps. Will use AT90USB1286 microcontroller, since the typical ATMega microcontroller is unavailable.

💻 🖥️ ⌨️ Open-source ~60% Mechanical Keyboard 🎉

Build Guide and additional information here!

- OLED Screen - Rotary Knob - Sandwich Mount Case - POM Switch Plate - 4 Layout Options - 32-bit Microcontroller

This project uses KiCad 6 for electrical CAD

This project uses FreeCAD 0.19 for mechanical CAD

Main Case Stackup. "0" is the bottom of the case.

Foot stackup. "0" is closest to the case and is on the "top"

Grabert, from the project README
From the project README

Main components on the Grabert

C85364C44854

Grabert bill of materials (BOM)

78 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C85364
AMS1117-3.3
U1
1
C44854
STM32F072V8Tx
U2
1
C160404
Conn_01x02
J1
1
AVR-ISP-6
Conn_01x02
J2
1
Conn_01x05
J3
1
USB_C_Receptacle_USB2.0
J4
1
SSD1306
J5
1
Conn_01x03
J6
46
1.00u
SW0_0, SW0_1, SW0_2, SW0_3, SW0_4, SW0_5, SW0_6, SW0_7 +38
1
2.00u_or_1.00and1.00
SW0_13-14
1
C318884
RotaryEncoder_Switch
SW1
2
1.50u
SW1_0, SW1_13
1
1.75u_stepped_caps_lock
SW2_0
1
2.25u
SW2_12
1
2.25u_or_1.25and1.00
SW3_0-1
1
2.75u_or_1.75and1.00
SW3_12-13
3
1.25u
SW4_0, SW4_1, SW4_2
1
6.25u
SW4_3
1
4x1.25u_or_5x1.00u
SW4_4-8
1
C49678
10uF
C1
Show 7 more
QtyPartRefs
1
C49678
4.7uF
C2
1
C49678
100nF
C3
1
C15850
100nF
C4
2
C1804
100nF
C5, C7
1
C28323
100nF
C6
2
C17561
5.1k
R1, R2
2
C17414
5.1k
R3, R4

Grabert design files

The KiCad project lives in the hsaito18/mini-keyboard repository on GitHub; these links point at the commit this page was built from.

Grabert: common questions

What microcontroller does the Grabert use?

The Grabert is built around the C44854, from the STM32 family.

How big is the Grabert PCB?

The Grabert measures 285.8 × 120.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Grabert?

78 components, from 27 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 Grabert design files?

From the hsaito18/mini-keyboard 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 Grabert design in my own project?

The repository has no license, so all rights stay with hsaito18. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Grabert 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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