HardLabs

KHEops70

mgsg·KHEops70·hardware/kicad/KHEops70.kicad_pcb

KHEops70 PCB layout, top view — open source STM32 board by mgsg

About the KHEops70 PCB

KHEops70 is an open source STM32 PCB design by mgsg, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 285 × 94.6 mm, with 477 components from 35 distinct parts.

Its main chip is the STM32F303CBTX, from the STM32 family. Other key parts include the AMS1117-3.3, 74HC4067 and TPD4E05U06DQAR. By type, the board carries 229 capacitors, 88 resistors, 70 LEDs, 10 ICs, 3 transistors and 2 diodes.

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

From the project

Keyboard | Hall Effect | OrthoLinear | Programmable | Standard-sized

- 70 HE switches, 60% case, 13x5 + 5 keys + 1 encoder + 2 potentiometers in ortholinear arrangement. - All keys are 1u. Keycaps in uniform profile preferred (XDA, DSA...). - QMK Firmware compatibility. - QMK MIDI Support (Audio support buggy). - Compatibility with "standard" widely available 60% keyboard cases. - OLED display.

Design for PCBs can be found in the hardware folder.

KHEops70, from the project README
From the project README

Main components on the KHEops70

AMS1117-3.3STM32F303CBTX74HC4067TPD4E05U06DQAR

KHEops70 bill of materials (BOM)

477 components, 35 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AMS1117-3.3
U1
1
STM32F303CBTX
STM32F303CBTx
U3
5
74HC4067
U4, U6, U7, U8, U9
1
TPD4E05U06DQAR
74HC4067
Texas Instruments
U5
2
TPD4E05U06DQAR
H5VU25U
Texas Instruments
U10, U11
3
BSS138
Q1, Q2, Q3
1
8MHZ
8MHz
Y1
1
R95
r95
BZ1
70
SLSS49E-3
HL0, HL1, HL2, HL3, HL4, HL5, HL6, HL7 +62
1
SW_SPST
SW1
1
SM04B-SRSS-TB
JST
USB11
42
MX_SK6812MINI-EA
LED0, LED1, LED2, LED3, LED4, LED5, LED6, LED7 +34
28
MX_SK6812MINI-EA
LED13, LED14, LED15, LED16, LED17, LED18, LED19, LED20 +20
2
1N4148WS
D1, D44
1
120R @ 100MHz
FB2
2
10U
10u
C3, C183
1
100U
100u
C4
1
4U7
4u7
C5
4
100N
100n
C6, C7, C8, C9
2
1u
C10, C11
Show 15 more
QtyPartRefs
2
10P
10p
C13, C14
217
100N
100n
C15, C16, C17, C18, C19, C20, C21, C22 +209
1
1K5
1k5
R1
1
470R
R2
2
1
R4, R5
72
10K
10k
R6, R10, R11, R12, R13, R14, R15, R16 +64
1
1k
R7
3
0
R8, R99, R100
1
470
R9
1
330K
330k
R91
1
1M
R92
2
10K
10k
R93, R98
1
100K
100k
R95
1
100
R96
1
1k
R97

KHEops70 design files

The KiCad project lives in the mgsg/KHEops70 repository on GitHub; these links point at the commit this page was built from.

KHEops70: common questions

What microcontroller does the KHEops70 use?

The KHEops70 is built around the STM32F303CBTX, from the STM32 family.

How big is the KHEops70 PCB?

The KHEops70 measures 285 × 94.6 mm, has 4 copper layers and is 1.61668 mm thick.

How many components are on the KHEops70?

477 components, from 35 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 KHEops70 design files?

From the mgsg/KHEops70 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 KHEops70 design in my own project?

Yes, under the terms of its GPL-3.0 license, which mgsg chose for the repository.

Can I test firmware for the KHEops70 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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