Unison
jpskenn·Unison·PCB/Unison.kicad_pcb
About the Unison PCB
Unison is an open source AVR/Arduino PCB design by jpskenn, published on GitHub under the MIT license. It is a 2-layer board measuring 285 × 95.1 mm, with 281 components from 31 distinct parts.
Its main chip is the ATmega32U4-MU, from the AVR/Arduino family. By type, the board carries 95 diodes, 10 inductors, 8 LEDs, 7 capacitors, 7 resistors and 4 connectors.
It belongs with the keyboards designs in this gallery.
From the project
2-way turn around keyboard for Computer & Music
ユニゾン(Unison)は、GH60互換の60%ケースに収まる狭ピッチキーボードです。
ロータリーエンコーダを搭載しシーケンサーやMIDIキーボードとしてDAW連携を想定した”Misicスタイル(ミュージック・スタイル)”と、日常的なコンピュータ作業を想定した”Terminalスタイル(ターミナル・スタイル)”を用意しています。
音楽用とコンピュータ用のふたつのキーボードがひとつになるイメージから、音楽用語のユニゾンが名前の由来です。
- 格好良いシンセサイザー、OP-1へのオマージュ。 - 狭ピッチなキーボードを作ってみたい。 - 狭ピッチなキーボードを使ってみたい。 - 挟ピッチなキーボードに触れる機会を増やしたい。 - ケースのあるキーボードを作りたいが、ケースの設計が大変だから、GH60型のケース対応にしてケース設計をメイン作業に含めない。 - キーキャップの選択肢を広げる。 安くて、そこそこ流通しているものが使えると普及しやすい。 標準的なキーキャプですべて埋められるレイアウトにしておく。 - 多キー、多ロータリーエンコーダ。

Main components on the Unison
Unison bill of materials (BOM)
281 components, 31 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATmega32U4-MU | QFN-44-1EP_7x7mm_Pitch0.5mm | U1 |
| 1 | 16MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering | Y1 |
| 1 | USB4085-GF-A_REVA | GCT_USB4085-GF-A_REVA | J1 |
| 1 | Conn_02x05[3_Odd_Even | PinHeader_2x03_P2.54mm_Vertical | J2 |
| 1 | LED Shade | PinSocket_1x03_P2.54mm_Vertical | J3 |
| 1 | Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | 500mA | Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder | F1 |
| 18 | MountingHole | M2_Hole | H1, H2, H3, H4, H5, H6, H7, H8 +10 |
| 1 | Speaker | Buzzer_Murata_PKMCS0909E4000-R1 | LS1 |
| 1 | 5.2x5.2mm | SW_SPST_SKQG_WithStem | ResetSW1 |
| 90 | SW_Push | CherryMX_MidHeight_16mm_rev2_merged_hole | SW_6, SW_7_1, SW_9, SW_10_1, SW_12_1, SW_12_2, SW_13_1, SW_13_2 +82 |
| 18 | SW_Push | CherryMX_MidHeight_16mm_rev2_merged_hole_1.5u_guide | SW_7_2, SW_8_2, SW_17_2, SW_18_2, SW_20_2, SW_25_3, SW_30_2, SW_35_3 +10 |
| 10 | SW_Push | CherryMX_MidHeight_16mm_rev2_merged_hole_2u_guide | SW_10_2, SW_19_2, SW_35_1, SW_35_2, SW_39_2, SW_45_1, SW_45_2, SW_65_1 +2 |
| 3 | SW_Push | CherryMX_MidHeight_16mm_rev2_merged_hole_2U_vertical_guide | SW_25_2, SW_60_2, SW_90_2 |
| 1 | SW_Push | CherryMX_MidHeight_16mm_rev2_merged_hole_1.5u_alt_guide | SW_37_2 |
| 5 | Rotary_Encoder_Switch | RotaryEncoder_Alps_EC11K-Switch_Vertical_H20mm | SW_RE1, SW_RE2, SW_RE3, SW_RE4, SW_RE5 |
| 5 | SW_Push | MXOnly-1U-NoLED_16mm | SW_8_1, SW_18_1, SW_21, SW_53, SW_91 |
| 2 | SW_Push | MXOnly-2U-NoLED_16mm | SW_60_3, SW_75_1 |
| 1 | SW_Push | MXOnly-1.5U-NoLED_16mm | SW_75_2 |
| 94 | D | D_SOD-123 | D1, D2, D3, D4, D5, D6, D7, D9 +86 |
Show 11 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PRTR5V0U2X | SOT-143 | D102 |
| 9 | SK6812MINI | LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | L1, L2, L3, L4, L5, L6, L7, L8 +1 |
| 1 | SERIAL_LED_TAPE | StripLED_rev3 | L15 |
| 1 | 10uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 2 | 22pF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3 |
| 3 | 0.1uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C5, C7 |
| 1 | 1uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6 |
| 1 | 1k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 2 | 10k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4, R9 |
| 2 | 5.1k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6 |
| 2 | 22 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R8 |
Unison design files
The KiCad project lives in the jpskenn/Unison repository on GitHub; these links point at the commit this page was built from.
- LayoutPCB/Unison.kicad_pcb
Unison: common questions
What microcontroller does the Unison use?
The Unison is built around the ATmega32U4-MU, from the AVR/Arduino family.
How big is the Unison PCB?
The Unison measures 285 × 95.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Unison?
281 components, from 31 distinct parts. The full bill of materials is listed on this page.
Where can I download the Unison design files?
From the jpskenn/Unison repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Unison design in my own project?
Yes, under the terms of its MIT license, which jpskenn chose for the repository.
Can I test firmware for the Unison without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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