HardLabs

Mkey

MabezDev·mkey·hardware/board/mkey.kicad_pcb

Mkey PCB layout, top view — open source ESP32 board by MabezDev

About the Mkey PCB

Mkey is an open source ESP32 PCB design by MabezDev, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 346.2 × 95.5 mm, with 162 components from 29 distinct parts.

Its main chip is the ESP32-S3-WROOM-1, from the ESP32 family. Other key parts include the SY8088. By type, the board carries 69 diodes, 9 resistors, 7 capacitors, 6 switches, 2 ICs and 2 connectors.

It belongs with the keyboards designs in this gallery.

From the project

A mechanical keyboard based on an ESP32-S3

A mechanical keyboard based on an ESP32-S3, with firmware written in Rust.

Click here to view the PCB & Schematic interactively in the browser

The USB port is intended for flashing, as well as software USB usage. Version 1.0 of the board however has the DP and DM pins swapped, therefore to flash the board from the factory (or if the flash is wiped for any reason) you must flash via UART0. The pinout is as follows:

Main components on the Mkey

ESP32-S3-WROOM-1SY8088

Mkey bill of materials (BOM)

162 components, 29 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-S3-WROOM-1
U1
1
SY8088
U2
1
USB_C_REP_2.0
J1
1
24 pin LCD FPC connector
J2
56
MX_SW_solder
MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8 +48
1
MX_SW_solder
MX15
1
MX_SW_solder
MX29
8
MX_SW_solder
MX42, MX56, MX57, MX58, MX60, MX61, MX62, MX63
1
MX_stab
S1
1
MX_stab
S2
1
MX_stab
S4
1
MX_stab
S5
2
SW_Push
SW0, SW1
66
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +58
1
B5819W
D67
1
PESD3V3L1BA,115
D68
1
SP0503BAHT
D69
1
C370436
SPH4018H2R2MT (2.2uH 2.2A)
L1
2
C52923
1uF 16V
C1, C5
2
C15850
10uF 16V
C2, C4
Show 9 more
QtyPartRefs
1
C1653
22pF 50V
C3
1
C1525
100nF 10V
C6
1
C15195
10nF 10V
C7
3
C25744
10kR 1%
R1, R2, R7
1
C25741
100kR 1%
R3
1
C43473
22k1R 1%
R4
2
C25905
5k1R 1%
R5, R6
1
C17168
0R 1%
R8
1
C25744
51.1R 1%
R9

Mkey design files

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

Mkey: common questions

What microcontroller does the Mkey use?

The Mkey is built around the ESP32-S3-WROOM-1, from the ESP32 family.

How big is the Mkey PCB?

The Mkey measures 346.2 × 95.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mkey?

162 components, from 29 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 Mkey design files?

From the MabezDev/mkey 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 Mkey design in my own project?

Yes, under the terms of its Apache-2.0 license, which MabezDev chose for the repository.

Can I test firmware for the Mkey without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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