2 layers
Encoder
byrantech/laptop
anyon_e, a highly integrated, high end, open source laptop. Attempt the impossible.
7 parts4.3kMIT
2 layers23 × 40.5 mm
Keylink revB
n2b8/morseforge_keylinkIt is designed and maintained by the MorseForge developer as a companion device for upcoming external‑key features in the MorseForge app.
- Size
- 23 × 40.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 7
- Nets
- 17
- Pads
- 37
- Tracks, vias
- 59, 8
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 10 Jan 2026
- Updated
- 16 Mar 2026
Overview
Keylink revB is an open-source printed circuit board by n2b8, from the n2b8/morseforge_keylink repository on GitHub. It is a 2-layer board of 23 × 40.5 mm with 7 parts on 17 nets, routed with 59 tracks and 8 vias.
Its parts include 2 resistors, 2 connectors, 1 capacitor, 1 IC and 1 switch. It belongs with the ESP32 and RISC-V boards of this library.
README
README.mdMorseForge Keylink
Keylink is an open‑source hardware adapter that makes traditional Morse keys Bluetooth‑capable.
It is designed and maintained by the MorseForge developer as a companion device for upcoming external‑key features in the MorseForge app.
🌐 MorseForge: https://morseforge.com
What is Keylink?
Keylink bridges classic Morse key hardware with modern Bluetooth‑enabled devices. It allows straight keys, paddles, and other traditional Morse inputs to transmit key events wirelessly using Bluetooth Low Energy (BLE).
Keylink is intended to:
- Enable wireless Morse key input
- Integrate directly with future MorseForge app features
- Remain compact, battery‑powered, and easy to assemble
- Be fully open source and community‑friendly
Unlike generic microcontroller dev boards, Keylink is a purpose‑built Morse interface.
Hardware Overview — Rev B
The current hardware revision (Rev B) includes:
- ESP32‑C3 microcontroller (Seeed XIAO form factor)
- 3.5 mm stereo jack (SJ1‑3523N) for Morse key input
- Slide power switch for battery isolation
- JST‑PH 2.0 mm battery connector
- LiPo battery support
- Passive input conditioning network
This revision has been fabricated via OSH Park and is undergoing validation.
PCB Renders (Rev B)
Top View
Bottom View
Renders generated from KiCad’s 3D viewer. These are not production photographs.
Repository Structure
hardware/
├── keylink_revB/ # KiCad schematic + PCB layout
├── gerber/ # Manufacturing Gerbers
mobile_app/ # React Native example app
software/ # Firmware (Arduino + legacy)Additional firmware and software directories will be added as development progresses.
Firmware & App Integration
Keylink firmware now uses the Arduino framework and exposes the device as a BLE
HID keyboard for Vail Adapter compatibility. The sketch lives at:
software/keylink_ble_keyboard/keylink_ble_keyboard.ino.
Key events:
- DIT (left paddle) sends Ctrl + [
- DAH (right paddle) sends Ctrl + ]
Flashing (Arduino)
- Install Arduino IDE and the ESP32 board package.
- Install the "ESP32 BLE Keyboard" library (T-vK).
- Open
software/keylink_ble_keyboardin Arduino IDE. - Select board "Seeed XIAO ESP32C3" and flash.
- Pair the device as "Keylink" in your OS Bluetooth settings.
The prior CircuitPython UART firmware remains at software/code.py for
reference but is not Vail-compatible.
Open Source
This project is released as open‑source hardware and software.
Licensing details will be finalized and documented explicitly, but the intent is:
- Permissive open hardware
- Permissive firmware licensing
- Community contributions welcome
Disclaimer
This is experimental hardware.
No warranties are provided.
Use at your own risk.
Author
Keylink is designed and maintained by the MorseForge developer as part of the broader MorseForge ecosystem.
Parts
7| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 1 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | AudioJack3 | Connector_Audio:Jack_3.5mm_CUI_SJ1-3523N_Horizontal | J2 |
| 1 | Conn_01x02_Socket | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J1 |
| 1 | SW_SPST | Button_Switch_THT:SW_Slide_SPDT_Angled_CK_OS102011MA1Q | SW1 |
| 1 | XIAO ESP32C3 | XIAO_ESP32C3:xiao_esp32c3 | U1 |
Questions
How big is the Keylink revB PCB?
It measures 23 × 40.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Keylink revB use?
7 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Keylink revB KiCad files?
From the n2b8/morseforge_keylink repository on GitHub, at the commit this page was made from: the board is hardware/keylink_revB/keylink_revB.kicad_pcb and its schematic hardware/keylink_revB/keylink_revB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Keylink revB design in my own project?
Its repository states no licence, so its author keeps all rights: ask n2b8 before reusing the design.
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