2 layers50.8 × 17.8 mm
Xmega a4u target
mokus0/schematics
Various schematics and pcb layouts for my personal projects
97 parts1Unlicense
2 layers66 × 40.6 mm
UMIDI
theFork/uMIDI5MIDI application development toolkit
- Size
- 66 × 40.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 65
- Nets
- 70
- Pads
- 240
- Tracks, vias
- 494, 44
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 30 Jun 2013
- Updated
- 26 May 2026
Overview
UMIDI is an open-source printed circuit board by theFork, from the theFork/uMIDI repository on GitHub. It is a 2-layer board of 66 × 40.6 mm with 65 parts on 70 nets, routed with 494 tracks and 44 vias.
It is built around the ATXMEGA128A4U-MH, 74LS14PC and LT1129CST-3.3#PBF, with the JUMPER3 among its other parts. Its parts include 18 capacitors, 15 resistors, 10 connectors, 8 diodes and 4 ICs. It belongs with the audio and music boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
4
ATXMEGA128A4U-MH
VQFN-44(7x7)-40℃~+85℃ 1.6V~3.6V 128KB 12bit 12bit 2KB 32MHz 34 8/16 Bit 8KB AVR Built-in FLASH Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、Built-in general-purpose timer、Hardware CRC、Programmable watchdog、Infrared remote control VQFN-44-EP(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
74LS14PC
PDIP-14InvertersTexas Instruments
LT1129CST-3.3#PBF
SOT-223-30℃~+125℃@(Tj) 1 20V 3.3V 400mV 50uA 64dB@(120Hz) 700mA Fixed Over Current Protection Positive SOT-223-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAnalog DevicesVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsJUMPER3
HDR-TH_3P-P2.54-L7.6-W2.5HDR-TH-3P-2.54mm New Arrivals ROHSWürth ElektronikUncategorised
README
README.md __ __ _____ _____ _____
| \/ |_ _| __ \_ _|
_ _| \ / | | | | | | || |
| | | | |\/| | | | | | | || |
| |_| | | | |_| |_| |__| || |_
| _,_|_| |_|_____|_____/_____|
| |
|_|The swiss army knife for quick and easy developement of MIDI applications. Possible applications are everything that uses MIDI.
Documentation
Documentation of hard- and software can be found at https://thefork.github.io/uMIDI/.
Parts
65| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100n | SMD-0603:SMD-0603 | C2, C3, C5, C7, C8, C9, C10, C14, C15, C16 |
| 8 | 120 | SMD-0603:SMD-0603 | R1, R2, R3, R4, R5, R6, R11, R12 |
| 7 | 10u | SMD-0603:SMD-0603 | C1, C4, C11, C12, C13, L2, L3 |
| 4 | JUMPER | Solderjumper:SJ2 | JP2, JP3, JP4, JP5 |
| 4 | P*** | Connect:1pin | 1PIN, 1PIN, 1PIN, 1PIN |
| 3 | DIODE | SMD:DO-214-AC_SMA | D1, D2, D3 |
| 3 | TVS | SMD-0603:SMD-0603 | D4, D5, D6 |
| 2 | 10k | SMD:SMD-0603 | R14, R15 |
| 2 | LED | SMD-0603:SMD-0603 | D7, D8 |
| 1 | 10k | SMD-0603:SMD-0603 | R9 |
| 1 | 1M | SMD-0603:SMD-0603 | R10 |
| 1 | 220 | SMD-0603:SMD-0603 | R7 |
| 1 | 270 | SMD-0603:SMD-0603 | R8 |
| 1 | 4.7k | SMD-0603:SMD-0603 | R13 |
| 1 | 4.7n | SMD-0603:SMD-0603 | C6 |
| 1 | 5..12 V | Pinheaders:PINHEAD1-2 | P5 |
| 1 | 6N138 | Opto:Optocoupler_DIP8_SMD | IC4 |
| 1 | 74LS14 | SMD:SOIC-14_N | IC2 |
| 1 | ATXMEGA128A4U-M | Atmel:QFN-44-1EP | IC1 |
| 1 | Bead | SMD-0603:SMD-0603 | L1 |
| 1 | GPIO1 | Connect:VASCH5x2 | P7 |
| 1 | GPIO2 | Connect:VASCH5x2 | P8 |
| 1 | GPIO3 | Connect:VASCH5x2 | P9 |
| 1 | JUMPER3 | Solderjumper:SJ3 | JP1 |
| 1 | LT1129CST-3.3 | SOT223:SOT-223 | IC3 |
| 1 | MIDI In | Pinheaders:PINHEAD1-2 | P1 |
| 1 | MIDI Out | Pinheaders:PINHEAD1-2 | P4 |
| 1 | MIDI T/O | Pinheaders:PINHEAD1-2 | P3 |
| 1 | MIDI Thru | Pinheaders:PINHEAD1-2 | P2 |
| 1 | PDI | Pin_Headers:Pin_Header_Straight_2x03 | P6 |
| 1 | USB-MINI-B | Pinheaders:UX60MB-5ST | CON1 |
Questions
How big is the UMIDI PCB?
It measures 66 × 40.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the UMIDI use?
65 parts, built around the ATXMEGA128A4U-MH, 74LS14PC, LT1129CST-3.3#PBF and JUMPER3. 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 UMIDI KiCad files?
From the theFork/uMIDI repository on GitHub, at the commit this page was made from: the board is hardware/uMidi.kicad_pcb and its schematic hardware/uMidi.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the UMIDI design in my own project?
Its repository states no licence, so its author keeps all rights: ask theFork before reusing the design.
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