4 layers81.2 × 96.6 mm
2 layers340.8 × 116.7 mm
Melokey
lejoannac/melokey2A midi keyboard design with a purpose of educating neurodivergent students
- Size
- 340.8 × 116.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 62
- Nets
- 85
- Pads
- 323
- Tracks, vias
- 437, 44
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 8 Jul 2024
- Updated
- 28 Dec 2025
Overview
Melokey is an open-source printed circuit board by lejoannac, from the lejoannac/melokey repository on GitHub. It is a 2-layer board of 340.8 × 116.7 mm with 62 parts on 85 nets, routed with 437 tracks and 44 vias.
It is built around the SN74AHCT125N and SK6812-EC20. Its parts include 30 diodes, 17 switches and 2 ICs. It belongs with the RP2040 boards of this library.
Main components
2
SN74AHCT125N
DIP-14-40℃~+85℃ 1 20uA 4 4.5V~5.5V 74AHCT 8mA 8mA Tri-State Unidirectional DIP-14 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
SK6812-EC20
SMD,2x2mm-40℃~+80℃ 0.65mA 0.65mm 100mcd~200mcd 160mcd~320mcd 160° 1kHz 2000V 2mm 2mm 3.7V~5.5V 460nm~475nm 50mcd~100mcd 520nm~535nm 620nm~630nm 800Kbit/s Built-in power-on reset circuit、Built-in one-way transmission function Semi-transparent lens SMD,2x2mm RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
README
README.mdmelokey
A midi keyboard designed with the purpose of educating neurodivergent students and providing them with a pathway to music
features
- High contrast, large keys to aid in student's comfort
- Immediate visual feedback through light-up keys
- Visual and auditory prompts to assist learning chords, scales, and songs
- Companion iPad app that makes making-making an easy and enjoyable experience!
CAD Model
PCB Design
Schematic
App design
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D10, D11, D12, D13, D14, D15, D16, D17 +1 |
| 13 | SK6812-E | SK6812-E:LED_SK6812-Eneww | D18, D19, D20, D21, D22, D23, D24, D25, D26, D27, D28, D29, D30 |
| 13 | SW_Push | ScottoKeebs_MX:MX_PCB_3.00u_90degnew | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13 |
| 4 | SW_Push | ScottoKeebs_MX:MX_PCB_1.00unew | SW14, SW15, SW16, SW17 |
| 1 | Raspberry_Pi_Pico | ScottoKeebs_MCU:Raspberry_Pi_Pico | U1 |
| 1 | SN74AHCT125N | SN74AHCT125N:DIP794W45P254L1930H508Q14 | U2 |
The 49 most common of 62 parts.
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Questions
How big is the Melokey PCB?
It measures 340.8 × 116.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Melokey use?
62 parts, built around the SN74AHCT125N and SK6812-EC20. 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 Melokey KiCad files?
From the lejoannac/melokey repository on GitHub, at the commit this page was made from: the board is melokey.kicad_pcb and its schematic melokey.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Melokey design in my own project?
Its repository states no licence, so its author keeps all rights: ask lejoannac before reusing the design.