HardLabs

Kbdrelay

mdthorpe·kbdrelay·hardware/pcb-carrier/kbdrelay-carrier/kbdrelay-carrier-v0.1.kicad_pcb

Kbdrelay PCB layout, top view — open source ESP32 board by mdthorpe
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About the Kbdrelay PCB

Kbdrelay is an open source ESP32 PCB design by mdthorpe, published on GitHub. It is a 2-layer board measuring 88 × 55 mm, with 18 components from 10 distinct parts.

Its main chip is the ESP32-S3-ZERO, from the ESP32 family. By type, the board carries 9 resistors, 3 connectors, 2 ICs, 2 capacitors, 1 fuse and 1 diode.

It belongs with the displays & leds and dev boards & breakouts designs in this gallery, and the repository also holds 1 earlier revision of it.

From the project

Project for replicating USB HID messages over SPI

Single-sided, through-hole KiCad carrier PCB that hosts two socketed Waveshare ESP32-S3-Zero modules (KBD + TGT) and joins them into the kbdrelay bridge.

v0.1 is shipped and hardware-verified (tag v0.1-board). The pcb-carrier-board spec is closed as the v0.1 record — do not amend it. New work happens in the v0.2 spec.

- Use project-local libraries (Project-scope in KiCad) so the design is self-contained for anyone who clones the repo. - Board is single copper layer (bottom), all discretes through-hole. Jumper-link budget was ≤ ~8; v0.1 shipped with zero — the hand route needed none, at…

Main components on the Kbdrelay

ESP32-S3-ZERO

Kbdrelay bill of materials (BOM)

18 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
ESP32-S3-ZERO
ESP32-S3-Zero
U1, U2
1
PREC003SAAN-RC
UART_KBD
J1
1
PREC003SAAN-RC
UART_TGT
J2
1
PREC002SAAN-RC
5V_IN
J3
1
60R090XU
PPTC 0.9A 60R090
F1
1
1N5817
D1
1
EEU-FC1C471
470uF/16V
C1
1
K104K15X7RF53H5
100nF
C2
5
CFR-25JB-52-2K2
2.2k
R1, R2, R3, R4, R5
4
CFR-25JB-52-1K
1k
R6, R7, R8, R9

Kbdrelay design files

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

Kbdrelay: common questions

What microcontroller does the Kbdrelay use?

The Kbdrelay is built around the ESP32-S3-ZERO, from the ESP32 family.

How big is the Kbdrelay PCB?

The Kbdrelay measures 88 × 55 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Kbdrelay?

18 components, from 10 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 Kbdrelay design files?

From the mdthorpe/kbdrelay repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Kbdrelay design in my own project?

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

Can I test firmware for the Kbdrelay 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.

Earlier revisions in the repo: kbdrelay-carrier

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