HardLabs

Midi fader

kcuzner·midi-fader·kicad/midi-fader.kicad_pcb

Midi fader PCB layout, top view — open source STM32 board by kcuzner

About the Midi fader PCB

Midi fader is an open source STM32 PCB design by kcuzner, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 73.7 × 78.7 mm, with 91 components from 28 distinct parts.

Its main chip is the STM32F042KxT, from the STM32 family. Other key parts include the USBLC6-2, MCP1603, MIC2776L, MIC5501-XYM5 and 74HC165. By type, the board carries 48 resistors, 26 capacitors, 7 ICs, 4 connectors, 2 switches and 2 inductors.

It belongs with the audio and power & battery designs in this gallery.

From the project

Expandable USB MIDI device with faders and buttons

PCB complete and working (with an additional load added to reduce regulator noise) Firmware feature-complete and mostly working Emulates as HID and USB-MIDI devices Not tested on Windows yet Case OpenSCAD in progress Configuration host software in progress

Two 60mm analog fader inputs USB Audio Class interface, aiming for driverless on Windows 7 and 10 Driverless HID interface for configuration It might be trivially simple to echo the fader status in the HID reports...

Main components on the Midi fader

STM32F042KxTUSBLC6-2MCP1603MIC2776LMIC5501-XYM574HC165STP08DP05

Midi fader bill of materials (BOM)

91 components, 28 distinct parts.

QtyPartRefs
1
STM32F042KxT
U1
1
USBLC6-2
U2
1
MCP1603
U3
1
MIC2776L
U4
1
MIC5501-XYM5
U5
1
74HC165
U6
1
STP08DP05
U7
1
SWD
J1
1
EXTERNAL_OUT
J2
1
EXTERNAL_IN
J3
1
USB_OTG
J4
2
10K
RV1, RV2
2
TR2-21-L5
SW1, SW2
1
10u
L1
1
4.7u
L2
7
0.1u
C1, C2, C16, C19, C23, C25, C26
6
1u
C3, C15, C17, C20, C21, C24
1
0.01u
C4
9
SPR
C5, C6, C7, C8, C9, C10, C11, C12 +1
3
4.7u
C14, C18, C22
Show 8 more
QtyPartRefs
17
0
R1, R2, R3, R5, R6, R7, R8, R9 +9
7
SPR
R4, R16, R19, R22, R23, R39, R43
8
33
R11, R12, R24, R25, R26, R27, R38, R42
1
1K
R14
12
10K
R15, R21, R28, R29, R30, R31, R32, R33 +4
1
220
R17
1
750
R18
1
2K2
R44

Midi fader design files

The KiCad project lives in the kcuzner/midi-fader repository on GitHub; these links point at the commit this page was built from.

Midi fader: common questions

What microcontroller does the Midi fader use?

The Midi fader is built around the STM32F042KxT, from the STM32 family.

How big is the Midi fader PCB?

The Midi fader measures 73.7 × 78.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Midi fader?

91 components, from 28 distinct parts. The full bill of materials is listed on this page.

Where can I download the Midi fader design files?

From the kcuzner/midi-fader repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Midi fader design in my own project?

Yes, under the terms of its Apache-2.0 license, which kcuzner chose for the repository.

Can I test firmware for the Midi fader without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

Similar boards