HardLabs

Main board

jkominek·piano-conversion·hardware/main-board/main-board.kicad_pcb

Main board layout, top view — open source STM32 board by jkominek

About the Main board

Main board is an open source STM32 PCB design by jkominek, published on GitHub under the Custom license license. It is a 4-layer board measuring 100 × 100 mm, with 148 components from 50 distinct parts.

Its main chip is the STM32H743ZITx, from the STM32 family. Other key parts include the USBLC6-2SC6, 3.3V Reg and ISL83490. By type, the board carries 45 capacitors, 42 resistors, 17 transistors, 16 connectors, 13 inductors and 11 ICs.

It belongs with the audio and sensors designs in this gallery.

From the project

Hardware, and some firmware, for acoustic piano to MIDI controller conversion.

adc-board An STM32H743 reading 22 ADC channels and sending the results over RS485. led-power Provides power to 8 strings of 22 CNY70 IR LEDs. Needs +48V. Optional I2C control. led-test-bar For development only: little bar that holds a bunch of LEDs for testing the LED power board. link-adapter For development only: allows a PC to connect to an ADC or main board. main-board 8 ADC boards can plug in, their processed signals are managed by another STM32H743 and converted to MIDI in its various forms. Intended mainly for USB use, also has ethernet designed in. For all of the optional accessories…

Main components on the Main board

STM32H743ZITxUSBLC6-2SC63.3V RegISL83490

Main board bill of materials (BOM)

148 components, 50 distinct parts.

QtyPartRefs
1
STM32H743ZITx
U1
1
USBLC6-2SC6
U2
1
3.3V Reg
U3
8
ISL83490
U5, U6, U7, U8, U9, U10, U11, U12
8
N Channel
Q1, Q2, Q3, Q4, Q9, Q10, Q11, Q12
9
P Channel
Q5, Q6, Q7, Q8, Q13, Q14, Q15, Q16 +1
1
20MHz Oscillator
X1
1
32.768kHz Oscillator
X2
1
BOOT
J1
1
USB Header
J2
1
JTAG
J3
1
5V Input
J4
1
StatusPanel
J5
4
Qwiic
J6, J11, J12, J13
4
8P8CDouble
J7, J8, J9, J10
1
Micro_SD_Card_Det
J14
1
Interrupts1
J15
1
Interrupts2
J16
2
SolderJumper_2_Bridged
JP1, JP2
1
Ferrite
FB1
Show 30 more
QtyPartRefs
12
FB
FB2, FB6, FB7, FB8, FB9, FB10, FB11, FB12 +4
1
4.7uF
C1
1
DC17
C3
1
DC30
C4
1
DC33
C5
1
DC39
C6
1
DC52
C7
1
DC62
C8
1
DC72
C9
1
DC84
C10
1
DC108
C11
20
0.1uF
C12, C33, C34, C35, C36, C37, C38, C39 +12
1
DC121
C13
1
DC131
C14
1
DC144
C15
1
DC95
C16
3
DC
C17, C21, C46
2
2.2uF
C18, C19
4
1uF
C20, C42, C43, C44
1
10uF
C47
1
22uF
C48
2
10k
R1, R25
1
2200
R2
1
4300
R3
8
1200
R4, R5, R6, R7, R16, R17, R18, R19
8
120
R8, R9, R10, R11, R12, R13, R14, R15
9
1000
R20, R21, R22, R23, R32, R33, R34, R35 +1
8
4700
R24, R26, R28, R30, R36, R38, R40, R42
3
27
R44, R45, R46
2
660
R48, R49

Main board design files

The KiCad project lives in the jkominek/piano-conversion repository on GitHub; these links point at the commit this page was built from.

Main board: common questions

What microcontroller does the Main board use?

The Main board is built around the STM32H743ZITx, from the STM32 family.

How big is the Main board?

The Main board measures 100 × 100 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Main board?

148 components, from 50 distinct parts. The full bill of materials is listed on this page.

Where can I download the Main board design files?

From the jkominek/piano-conversion repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Main board design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Main board 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.

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