HardLabs

LaserHarp3

amonbenson·laserharp·hardware/pcb/JLCPCB_Order_Rev3.1_25.08.2024/LaserHarp3.kicad_pcb

LaserHarp3 PCB layout, top view — open source STM32 board by amonbenson

About the LaserHarp3 PCB

LaserHarp3 is an open source STM32 PCB design by amonbenson, published on GitHub. It is a 2-layer board measuring 99.1 × 59.7 mm, with 88 components from 24 distinct parts.

Its main chip is the STM32F103C8T6, from the STM32 family. Other key parts include the AMS1117-3.3, 6N137 and 74HC595. By type, the board carries 38 resistors, 25 transistors, 12 capacitors, 6 ICs, 4 diodes and 2 crystals.

It belongs with the audio designs in this gallery.

From the project

Setup a virtual environment and install the dependencies:

Setup a virtual environment and install the dependencies:

see https://wiki.linuxaudio.org/wiki/raspberrypi

see https://www.jeffgeerling.com/blog/2023/reducing-raspberry-pi-5s-power-consumption-140x

- Root note: C3 (midi note 48, one octave below middle C) - Global transpose setting

- Modes: - Pedal Harp: For each note, choose one of: - flat - natural - sharp - Custom Scale: - each diode can be assigned to a specific midi note

Main components on the LaserHarp3

STM32F103C8T6AMS1117-3.36N13774HC595

LaserHarp3 bill of materials (BOM)

88 components, 24 distinct parts.

QtyPartRefs
1
STM32F103C8T6
U1
1
AMS1117-3.3
U2
1
6N137
U3
3
74HC595
U4, U5, U6
1
AO3401A
Q1
24
2N7002
Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9 +16
1
8 MHz
Y1
1
32.768 KHz
Y2
1
USB Type C
J1
2
1N5819
D1, D3
1
ZMM5V6
D2
1
1N4148WS
D4
8
100n
C4, C5, C7, C8, C9, C10, C15, C16
4
10p
C11, C12, C13, C14
2
5.1k
R1, R2
3
100k
R3, R10, R11
1
220
R4
1
470
R5
2
47
R6, R7
1
1k
R8
Show 4 more
QtyPartRefs
25
10k
R9, R12, R13, R14, R15, R16, R17, R18 +17
1
1.5k
R36
1
220k
R37
1
330k
R38

LaserHarp3 design files

The KiCad project lives in the amonbenson/laserharp repository on GitHub; these links point at the commit this page was built from.

LaserHarp3: common questions

What microcontroller does the LaserHarp3 use?

The LaserHarp3 is built around the STM32F103C8T6, from the STM32 family.

How big is the LaserHarp3 PCB?

The LaserHarp3 measures 99.1 × 59.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the LaserHarp3?

88 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the LaserHarp3 design files?

From the amonbenson/laserharp repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the LaserHarp3 design in my own project?

The repository has no license, so all rights stay with amonbenson. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the LaserHarp3 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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