2 layers116.8 × 30 mm
Type d
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
14 parts3kApache-2.0
2 layers63.5 × 53.5 mm
Ebeep
Av1zi/Ebeep3a custom 'beeper' with an eInk display and 3 mechanical switches
- Size
- 63.5 × 53.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 24
- Pads
- 58
- Tracks, vias
- 79, 1
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 1 Jun 2026
- Updated
- 1 Nov 2026
Overview
Ebeep is an open-source printed circuit board by Av1zi, from the Av1zi/Ebeep repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 63.5 × 53.5 mm with 14 parts on 24 nets, routed with 79 tracks and 1 via.
Its parts include 2 capacitors and 2 resistors. It belongs with the lEDs and displays and keyboards and input boards and the ESP32 and RISC-V boards of this library.
README
README.mdEbeep
Two handheld wireless devices that can message each other and play games, built as a personal gift.
E for eInk. Beep for beeper
Project Showcase
3D render
https://github.com/user-attachments/assets/bd9d271b-df7e-4e4d-8fb2-d193bfb4d486
Walkthrough
https://github.com/user-attachments/assets/030f00d7-5b2a-4592-a6ae-74eca7de7010
Features
- Messaging - 3-button scrollable alphabet, double-space to send
- Games - TicTacToe, Connect 4, and Blackjack
- E-Ink display - 2.9" screen
- Battery powered - USB-C charging
- Deep sleep - sleeps when you're not using it to save battery
- Works anywhere with WiFi - the two devices talk over MQTT, so they don't need to be near each other
Hardware
| Component | Part |
|---|---|
| Microcontroller | Seeed XIAO ESP32-C6 |
| Display | WeAct 2.9" eInk |
| Battery | 3.7V LiPo, 3000mAh |
| Buttons | 3× low profile mechanical keyboard switches |
| Case | ~76g PLA, 4× M4 heated inserts, 4× M4×25 screws |
| Other | 2× 200kΩ resistors, 5×7cm perfboard |
How It Works
Communication
Both devices connect to WiFi and talk through an MQTT broker (I used the free HiveMQ Cloud tier). Each device listens on its own topic and publishes to the other one's.
WiFi Setup
When the device wakes up and none of its known networks are in range, it opens a hotspot (Ebeep_1_config or Ebeep_2_config). Connect to it from any phone/pc and a setup page pops up automatically, there you will have to enter the wifi details and press done. (to save battery the hotspot will close by itself after 5 minutes) The device remembers up to 5 networks and picks whichever one is in range.
Walkthrough:
https://github.com/user-attachments/assets/75ae72dc-5833-4c83-8c6c-1c9a049145ae
Typing Interface
- Left / Right - scroll through characters (
SPC A B C ... Z . ! ? <3) - Select - confirm the current character
- Two spaces in a row - send the message
- DEL on empty - exit compose
Games
- TicTacToe - classic 3×3. Whoever starts the match first goes first.
- Connect 4 - 7×6 grid, pieces drop with gravity.
- Blackjack - single player (the only one that doesn't need the other device). Dealer stands on soft 17.
Power Management
The beeper goes to sleep if you don't use it for 10 minutes (you can change this in config.h). While asleep it disconnects from WiFi and the MQTT server and basically shuts off to save battery.
Wake it by pressing the left or middle button. On wake-up it looks for a network it remembers, and if it can't find one it starts its own hotspot so you can set up WiFi again (see WiFi Setup).
PCB
A custom PCB has been fully designed and routed in KiCad to replace the hand-wired perfboard build. It's not ordered or fabricated yet, so the build instructions below are still perfboard based. The PCB is a planned upgrade for a future revision.
[!WARNING] The PCB has not been fitted or tested against the case files in this repo. If you order it, expect to redesign the case (or at least the mounting points) to fit. It is not a drop-in replacement yet.
Building Your Own
Print Settings
I used the printer default settings, with tree supports. I have a multi-nozzle printer so I used a support interface layer for a cleaner surface, but it's not necessary.
Electrical Diagram
Building Instructions
- 3D print the files from the
CAD/STLfolder - Solder everything onto the perfboard following the electrical diagram above
- Flash the code (see Setting Up the Code below) and test before closing the case
- Fit the components into the case and put double-sided tape under the battery to hold it
- Press in the 4× M4 heated inserts, then screw the case shut with the M4 screws
Setting Up the Code
- In
include/config.hchangeDEVICE_NUMto1on one device and2on the other - Copy
include/secret.example.htoinclude/secret.hand fill in your MQTT broker credentials (secret.his gitignored so it stays private) - Upload via PlatformIO. The
huge_app.csvpartition scheme is required - On first boot, connect to the config hotspot (
Ebeep_1_configorEbeep_2_config) and enter your WiFi credentials
License
GPL 3.0 - Do whatever you want with it, just keep it open source as well.
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | SW_Push | PCM_Switch_Keyboard_Kailh:SW_Kailh_Choc_V2_1.00u | BTN_LEFT, BTN_RIGHT, BTN_SELECT |
| 2 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2 |
| 2 | 200K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 1 | Conn_01x02 | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | JST-PH-2pin1 |
| 1 | WeAct 2.9" ePaper | Connector_Molex:Molex_PicoBlade_53048-0810_1x08_P1.25mm_Horizontal | Epaper |
| 1 | XIAO-ESP32-C6-SMD | Seeed_Studio_XIAO_Series:XIAO-ESP32-C6-SMD | ESP32 |
The 10 most common of 14 parts.
Questions
How big is the Ebeep PCB?
It measures 63.5 × 53.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ebeep use?
14 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 Ebeep KiCad files?
From the Av1zi/Ebeep repository on GitHub, at the commit this page was made from: the board is PCB/Ebeep.kicad_pcb and its schematic PCB/Ebeep.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ebeep design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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