Three Octave #

A 38-key (3-octave + 1) keyboard. Powered by Vial firmware.

This keyboard is based on a 60% column staggered keyboard like the HHKB, which omits the number and symbol keys to reduce the number of keys to 38.

Layout

v0.3.0

Layer 0:

MEMO: I couldn't figure out how to map keys to fn on macOS using Vial, so I am using Karabiner-Elements, a macOS app, to modify right_control to fn.

Layer 1, 2: arrows, symbols

Layer 3, 4: nums, symbols

Layer 5: fn

RAW data for Keyboard Layout Editor v0.15:

📄 keyboard-layout.rawdata.json

[{a:1},"LT 2\nEsc",{a:7},"Q","W","E","R","T","Y","U","I","O","P","Bksp"],
[{a:1,w:1.25},"LT 1\nTab",{a:7},"A","S","D","F","G","H","J","K","L",{a:1,w:1.75},"LT 4\nEnter"],
[{a:7,w:1.75},"LShift","Z","X","C","V","B","N","M","MO(5)",{w:2.25},"MO(3)"],
[{x:0.75,w:1.25},"LCtrl",{a:1,w:1.25},"LGui_T\n英数",{a:7,w:6},"6u",{a:1},"RAlt_T\nかな",{a:7},"RCtrl"],

• 🔗 Keyboard Layout Editor

BOM

Material	QTY	Note
Three Octave Sharp PCBA	1
Three Octave Sharp Case	1
B-0204	4	Screw M2 L4, Hirosugi
SIS-2039-05	4	Washer d2 D3.9 t0.5, Hirosugi
LUW-0204-075	4	Washer d2.2 D4 t0.075, Hirosugi

Three Octave Sharp PCBA

Material	Symbol	QTY	Note
Three Octave Sharp PCB	-	1
30pF 402	C1, C2	2	C1570
1uF 402	C3, C4	2	C52923
100nF 402	C5-C14	10	C307331
10uF 402	C15, C16	2	C15525
HRO_TYPE-C-31-M-12	J1	1	C165948; USB Type-C Connector, Korean Hroparts Elec
10KΩ 0402	R1, R3	2	C25744
1KΩ 0402	R2, R4	2	C11702
27Ω 0402	R5, R6	2	C352446
5.1KΩ 0402	R7, R8	2	C25905
Hot_Swap_Socket_CPG151101S11	SW1-SW38	38	C5156480; How Swap Socket, Kailh
SKRPANE010	SW_B1, SW_R1	2	C470426; Tactile Switch, ALPS ALPINE
RP2040	U1	1	C2040; MCU, Raspberry Pi
W25Q64JVXGIQ	U2	1	C2940195, 64M-bit Serial Flash, Winbond Electronics
AP2112K-3.3TRG1	U3	1	C51118, 3.3V Linear Voltage Regulators
X322512MSB4SI	Y1	1	C9002, 12MHz 20pF Crystal Resonator, SMD-3225, Yangxing Tech

📁 production_data (for JLCPCB at 2024-01-25)

Three Octave Sharp Case

WIP

Schematic and PCB

📄 Three_Octave_Sharp.kicad_sch (v1.0.0)

📄 Three_Octave_Sharp.kicad_pcb (v1.0.1)

Key-matrix

	C0	C1	C2	C3	C4	C5	C6	C7	C8	C9	C10	C11
R0	Esc	Q	W	E	R	T	Y	U	I	O	P	BS
R1	Tab	A	S	D	F	G	H	J	K	L	Return
R2	Shift	Z	X	C	V	B	N	M	,	Shift	Opt	Fn
R3	Ctrl	Cmd	Space

Mechanics

The case also functions as a plate.

• 📄 Three-Octave-Sharp-Case.FCStd (v1.0.3)
  • 📄 Three-Octave-Sharp-Case-Top.step
  • 📄 Three-Octave-Sharp-Case-Bottom.step

Firmware

Vial

• Built UF2
  • 📄 takayoshiotake_three_octave_sharp_vial_20240407.uf2
• Code
  • 🔗 https://github.com/vial-kb/vial-qmk/tree/vial/keyboards/takayoshiotake/three_octave_sharp
  • 🔗 https://github.com/vial-kb/vial-qmk/tree/bbaed80505cf4ceaeb51d1e5fe79b23b22acf1a6

See vial-porting for more details.

License

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.