HardLabs

4HPicoDSP

rheslip·2HPico-Eurorack-Module-Hardware·4HPico DSP KiCad design files/4HPicoDSP.kicad_pcb

4HPicoDSP PCB layout, top view — open source RP2040/RP2350 board by rheslip
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About the 4HPicoDSP PCB

4HPicoDSP is an open source RP2040/RP2350 PCB design by rheslip, published on GitHub. It is a 2-layer board measuring 20.3 × 110 mm, with 71 components from 31 distinct parts.

Its main chip is the RP2350-WAVESHARE, from the RP2040/RP2350 family. Other key parts include the AMS1117-5.0, LM4040DBZ-10, TL072, PCM5102A and MCP6022. By type, the board carries 26 capacitors, 22 resistors, 8 connectors, 7 ICs, 2 jumpers and 2 diodes.

It belongs with the audio and displays & leds designs in this gallery.

From the project

2HP Eurorack module based on Raspberry Pi Pico 2

4HP Eurorack module based on Raspberry Pi RP2350 Pico 2

4HPico DSP is basically the 2HPico DSP with stereo audio in and out and two dedicated CV inputs. Encoder with a 64x32 OLED display instead of pots for setting parameters. This is a single PCB design which requires a 3D printed panel or PCB panel.

May 6/2026 - updated PCB to V1.1 which corrects missing GND plane connection from middle to bottom of PCB. not tested but changes are very minor

Main components on the 4HPicoDSP

AMS1117-5.0LM4040DBZ-10TL072PCM5102AMCP6022PCM1808PWR

4HPicoDSP bill of materials (BOM)

71 components, 31 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AMS1117-5.0
U3
1
LM4040DBZ-10
U4
1
TL072
U5
1
PCM5102A
U6
2
MCP6022
U7, U9
1
PCM1808PWR
U8
6
PJ3001F
J1, J2, J3, J4, J5, J6
1
CONN_02X05_ODD_EVEN
Conn_02x05_Odd_Even
J7
1
CONN_01X04_PIN
Conn_01x04_Pin
J8
2
DC INPUT
JP1, JP2
1
RP2350-WAVESHARE
RP2350-WaveShare
RZ1
1
RotaryEncoder_Switch
SW1
2
1N5819WS
D1, D2
2
33UH
33uH
L1, L2
7
10U
10u
C1, C2, C6, C8, C10, C19, C20
1
22U
22u
C3
10
.1u
C4, C7, C9, C12, C13, C14, C15, C16 +2
2
18P
18p
C5, C17
4
1u
C11, C18, C25, C26
2
2.2U
2.2u
C21, C22
Show 11 more
QtyPartRefs
2
100R
R1, R22
1
2.2K
2.2k
R2
1
33
R3
2
47K
47k
R4, R5
4
100K
100k
R6, R8, R16, R21
2
180K
180k
R7, R9
2
10K
10k
R10, R17
2
39K
39k
R11, R15
2
1k
R12, R19
2
20K
20k
R13, R14
2
120K
120k
R18, R20

4HPicoDSP design files

The KiCad project lives in the rheslip/2HPico-Eurorack-Module-Hardware repository on GitHub; these links point at the commit this page was built from.

4HPicoDSP: common questions

What microcontroller does the 4HPicoDSP use?

The 4HPicoDSP is built around the RP2350-WAVESHARE, from the RP2040/RP2350 family.

How big is the 4HPicoDSP PCB?

The 4HPicoDSP measures 20.3 × 110 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 4HPicoDSP?

71 components, from 31 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the 4HPicoDSP design files?

From the rheslip/2HPico-Eurorack-Module-Hardware repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the 4HPicoDSP design in my own project?

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

Can I test firmware for the 4HPicoDSP without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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