HardLabs

Drachma

coincase1·Drachma·Kicad/Drachma.kicad_pcb

Drachma PCB layout, top view — open source STM32 board by coincase1

About the Drachma PCB

Drachma is an open source STM32 PCB design by coincase1, published on GitHub. It is a 4-layer board measuring 138.1 × 119.1 mm, with 114 components from 18 distinct parts.

Its main chip is the C69336, from the STM32 family. Other key parts include the C5446, C485517 and C7519. By type, the board carries 59 capacitors, 4 ICs, 2 connectors, 2 switches, 2 resistors and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

30% Left-Handed HE Keyboard

Based on / Inspired by Peppapigh's HE60.

This keyboard is a PCB swap of the Kisnt 34 Key Numpad. With modifications to the top of the case using a hobby saw, this PCB fits inside of that case. The Drachma PCB connects to the Kisnt USB daughterboard using the provided Flat Conductor Cable. It also features a connection for a Pico-EZmate connector featured on Unified Daughterboards.

Drachma, from the project README
From the project README

Main components on the Drachma

C69336C5446C485517C7519

Drachma bill of materials (BOM)

114 components, 18 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C69336
STM32F446RET6
U1
1
C5446
XC6206P332MR-G
U3
1
C485517
TLV75733PDBV
U4
1
C7519
USBLC6-2SC6
U5
1
C13738
Crystal_GND24
Y1
1
C262712
Conn_01x06
J1
1
C588524
Conn_01x04
J2
6
C7793
SN74LV4051A
AM1, AM2, AM3, AM4, AM5, AM6
1
C910822
BSMD0805-050-24V
F1
37
C126669
OH49E-S
HE1, HE2, HE3, HE4, HE5, HE6, HE7, HE8 +29
2
C318884
TS-1187A-B-A-B
SW1, SW2
50
C1525
100n
C1, C2, C3, C4, C5, C6, C7, C8 +42
2
C32949
10p
C44, C46
3
C15849
1u
C47, C48, C88
2
C23630
2.2u
C49, C50
1
C19702
10u
C86
1
C19666
4.7u
C90
2
C25744
10k
R2, R3

Drachma design files

The KiCad project lives in the coincase1/Drachma repository on GitHub; these links point at the commit this page was built from.

Drachma: common questions

What microcontroller does the Drachma use?

The Drachma is built around the C69336, from the STM32 family.

How big is the Drachma PCB?

The Drachma measures 138.1 × 119.1 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Drachma?

114 components, from 18 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 Drachma design files?

From the coincase1/Drachma 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 Drachma design in my own project?

The repository has no license, so all rights stay with coincase1. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Drachma 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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