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Rp2040 mwtrackball

monroewilliams·rp2040_mwtrackball·RP2040_minimal_r2/RP2040_minimal_r2.kicad_pcb

Rp2040 mwtrackball PCB layout, top view — open source RP2040/RP2350 board by monroewilliams
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About the Rp2040 mwtrackball PCB

Rp2040 mwtrackball is an open source RP2040/RP2350 PCB design by monroewilliams, published on GitHub. It is a 2-layer board measuring 46 × 34 mm, with 45 components from 29 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the AP2112K-3.3TRG1 and W25Q128JVS. By type, the board carries 17 capacitors, 13 connectors, 7 resistors, 3 ICs, 2 switches and 1 crystal.

It belongs with the displays & leds, sensors and dev boards & breakouts designs in this gallery.

From the project

RP2040-based main board for my trackball design, based on the Minimal-KiCAD v2 sample from RPI

This work is based on version 2 of the "rp2040 Minimal KiCad" sample provided by the Raspberry Pi foundation here.

It is inspired by (although not directly based on) jfedor2's excellent RP2040+PMW3360 board. (Although I did borrow the USB header pinout directly from that project.)

I've modified it for the specific needs of my trackball design, with a few other additions that may make it useful for other experimentation as well. I intend it to pair with a breakout board design with matching JST plugs so that off-the-shelf cables can be used for assembly (instead of the hand-built sensor…

Main components on the Rp2040 mwtrackball

AP2112K-3.3TRG1W25Q128JVSRP2040

Rp2040 mwtrackball bill of materials (BOM)

45 components, 29 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AP2112K-3.3TRG1
U1
1
W25Q128JVS
U2
1
RP2040
U3
1
X322512MSB4SI
Y1
1
C7430455
SPI0.8
J1
1
C7430455
SPI0.9
J2
1
C7430455
SPI1.13
J3
1
C160390
I²C0
J4
1
C7429634
USB
J5
1
C160388
B16
J6
1
C160388
B17
J7
1
C160388
B18
J8
1
C160388
B19
J9
1
C160388
B20
J10
1
C160388
B21
J11
1
C7430455
GPIO26-29
J12
1
C160389
SWD
J13
1
C910763
PIEZO
LS1
1
C498294
BOOT
SW1
1
C498294
RESET
SW2
Show 9 more
QtyPartRefs
1
WS2812B-2020
D1
3
10U
10u
C1, C4, C17
2
15P
15p
C2, C3
10
100N
100n
C5, C6, C7, C9, C11, C12, C13, C14 +2
2
1u
C8, C10
2
1k
R1, R5
1
10K
10k
R2
2
27
R3, R4
2
100
R6, R7

Rp2040 mwtrackball design files

The KiCad project lives in the monroewilliams/rp2040_mwtrackball repository on GitHub; these links point at the commit this page was built from.

Rp2040 mwtrackball: common questions

What microcontroller does the Rp2040 mwtrackball use?

The Rp2040 mwtrackball is built around the RP2040, from the RP2040/RP2350 family.

How big is the Rp2040 mwtrackball PCB?

The Rp2040 mwtrackball measures 46 × 34 mm, has 2 copper layers and is 1 mm thick.

How many components are on the Rp2040 mwtrackball?

45 components, from 29 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 Rp2040 mwtrackball design files?

From the monroewilliams/rp2040_mwtrackball 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 Rp2040 mwtrackball design in my own project?

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

Can I test firmware for the Rp2040 mwtrackball 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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