HardLabs

Rowan

tpcarlson·synth-diy·rowan/rowan.kicad_pcb

Rowan PCB layout, top view — open source RP2040/RP2350 board by tpcarlson

About the Rowan PCB

Rowan is an open source RP2040/RP2350 PCB design by tpcarlson, published on GitHub. It is a 2-layer board measuring 60 × 39.6 mm, with 93 components from 38 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the DAC7554, NCP1117-3.3_SOT223, MCP6002-xMS, W25Q32JVSS and 74AHCT1G125. By type, the board carries 34 capacitors, 17 connectors, 15 resistors, 14 diodes, 10 ICs and 1 crystal.

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

From the project

Mostly Eurorack projects

Rowan is an expander for Sycamore, the dual looping sequencer. Rowan adds a couple of additional features that Sycamore was missing: Unquantized outputs, Chromatic outputs, and a display showing the currently active notes. In addition, Rowan includes two trigger outputs for the Chromatic outputs.

Rowan's core is an RP2040 microcontroller running a small Arduino sketch.

Rowan, from the project README
From the project README

Main components on the Rowan

DAC7554NCP1117-3.3_SOT223MCP6002-xMSW25Q32JVSSRP204074AHCT1G125LM4040LP-5NCP1117-5.0_SOT223

Rowan bill of materials (BOM)

93 components, 38 distinct parts.

QtyPartRefs
1
DAC7554
U1
1
NCP1117-3.3_SOT223
U2
2
MCP6002-xMS
U3, U4
1
W25Q32JVSS
U5
1
RP2040
U6
2
74AHCT1G125
U7, U8
1
LM4040LP-5
U9
1
NCP1117-5.0_SOT223
U10
1
Crystal_GND2
Y2
1
Conn_01x02
J1
1
USB_C_Receptacle_USB2.0_16P
J2
4
AudioJack2
J3, J4, J5, J6
2
AudioJack2
J7, J8
2
Conn_01x03
J9, J10
1
Conn_02x05_Odd_Even
J11
1
Conn_01x04
J12
1
Conn_01x03
J13
1
Conn_01x03
J14
1
Conn_01x03
J15
1
Conn_01x08
J16
Show 18 more
QtyPartRefs
1
Conn_01x08
J17
1
SW_Push
SW1
12
SK6812
D1, D2, D3, D4, D5, D6, D7, D8 +4
1
LED
D13
1
D_Schottky
D14
1
FerriteBead_Small
FB1
6
10u
C3, C5, C6, C7, C28, C30
24
100n
C4, C8, C9, C10, C12, C13, C14, C15 +16
2
1u
C11, C17
1
47u
C27
1
470n
C29
2
5.1k
R1, R2
4
1k
R3, R13, R14, R16
1
DNF
R4
4
100R
R6, R7, R8, R9
2
27
R10, R11
1
220R
R12
1
10k
R15

Rowan design files

The KiCad project lives in the tpcarlson/synth-diy repository on GitHub; these links point at the commit this page was built from.

Rowan: common questions

What microcontroller does the Rowan use?

The Rowan is built around the RP2040, from the RP2040/RP2350 family.

How big is the Rowan PCB?

The Rowan measures 60 × 39.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Rowan?

93 components, from 38 distinct parts. The full bill of materials is listed on this page.

Where can I download the Rowan design files?

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

Can I use the Rowan design in my own project?

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

Can I test firmware for the Rowan 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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