2 layers52.2 × 52.2 mm
Base
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
43 parts3kApache-2.0
2 layers106 × 20.3 mm
Squeezebar
encukou/squeezebarThis is a “matrix daughterboard” for handwired keyboards using a socketed Pro Micro style microcontroller. It's designed for Peter Lyons' Squeezebox, which has individual, swappable column modules,
- Size
- 106 × 20.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 43
- Nets
- 55
- Pads
- 159
- Tracks, vias
- 324, 3
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 26 Oct 2022
- Updated
- 21 Nov 2022
Overview
Squeezebar is an open-source printed circuit board by encukou, from the encukou/squeezebar repository on GitHub, published under the MIT licence. It is a 2-layer board of 106 × 20.3 mm with 43 parts on 55 nets, routed with 324 tracks and 3 vias.
Its parts include 3 connectors and 1 IC. It belongs with the AVR (ATmega, ATtiny) boards of this library.
README
README.mdSqueezeBar
This is a “matrix daughterboard” for handwired keyboards using a socketed Pro Micro style microcontroller. It's designed for Peter Lyons' Squeezebox, which has individual, swappable column modules,
This version supports up to 4 rows × 7 columns. Here's a picture from Peter's blog -- an assembled Squeezebar using just 5 of the columns:
You'll need two of these for a full keyboard. The halves can either each have a controller and communicate over I2C, or you can use one controller and connect using a cable with 11+ wires. (Keep the same 7 columns, and pick unused pins for 4 more rows.)
Pin Assignment
| Pro Micro pin | Function |
|---|---|
| F5 | Col 0 |
| F6 | Col 1 |
| F7 | Col 2 |
| B1 | Col 3 |
| B3 | Col 4 |
| B2 | Col 5 |
| B6 | Col 6 |
| D7 | Row 0 |
| B6 | Row 1 |
| E4 | Row 2 |
| B5 | Row 3 |
| D0 | I²C SCL |
| D1 | I²C SDA |
Dimensions & Mounting
The board is about 110×21mm (hence the Bar in the name), with two M3 mounting holes.
Discord
This thing grew in the Absolem Club Discord,
in Peter's channel #focusaurus.
That's the best place to ask any questions.
(Content warning: do not enter the Discord if you are allergic to weird keyboards.)
License
MIT
Parts
43| Qty | Value | Footprint | References |
|---|---|---|---|
| 28 | D | Library:Diode | 0;0, 0;1, 0;2, 0;3, 1;0, 1;1, 1;2, 1;3, 2;0, 2;1, 2;2, 2;3, 3;0, 3;1, 3;2, 3;3 +12 |
| 2 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965 | H2, H4 |
| 1 | COL0 | Library:PinHeader_Col_1x05_P2.54mm_Vertical | COL0 |
| 1 | COL1 | Library:PinHeader_Col_1x05_P2.54mm_Vertical | COL1 |
| 1 | COL2 | Library:PinHeader_Col_1x05_P2.54mm_Vertical | COL2 |
| 1 | COL3 | Library:PinHeader_Col_1x05_P2.54mm_Vertical | COL3 |
| 1 | COL4 | Library:PinHeader_Col_1x05_P2.54mm_Vertical | COL4 |
| 1 | COL5 | Library:PinHeader_Col_1x05_P2.54mm_Vertical | COL5 |
| 1 | COL6 | Library:PinHeader_Col_1x05_P2.54mm_Vertical | COL6 |
| 1 | Conn_02x08_Counter_Clockwise | Library:PinSocket_2x10_P2.54mm_Bespoke | J2 |
| 1 | Elite-C | 3dmodels:Elite-C | U1 |
| 1 | I2C | Library:PinHeader_I2C_1x04_P2.54mm_Vertical | J3 |
| 1 | PINSOCKET | Library:PinHeader_COLS_1x07_P2.54mm_Vertical | COLUMNS1 |
| 1 | PINSOCKET | Library:PinSocket_1x04_P2.54mm_Vertical_LongPads | ROWS2 |
| 1 | RESET | Library:PinHeader_RST_1x02_P2.54mm_Vertical | J1 |
Questions
How big is the Squeezebar PCB?
It measures 106 × 20.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Squeezebar use?
43 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 Squeezebar KiCad files?
From the encukou/squeezebar repository on GitHub, at the commit this page was made from: the board is squeezebar.kicad_pcb and its schematic squeezebar.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Squeezebar design in my own project?
Its repository publishes it under the MIT 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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