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Trackball lt6c

lambdakb·trackball-lt6c·pcb/lt6c-pcb.kicad_pcb

Trackball lt6c PCB layout, top view — open source RP2040/RP2350 board by lambdakb
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About the Trackball lt6c PCB

Trackball lt6c is an open source RP2040/RP2350 PCB design by lambdakb, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 62 × 66.4 mm, with 15 components from 9 distinct parts.

Its main chip is the XIAO-RP2040, from the RP2040/RP2350 family. Other key parts include the TPS76318 and PMW3360DM-T2QU. By type, the board carries 6 switches, 4 capacitors, 3 ICs and 2 resistors.

From the project

LT6C 6 Keys Trackball

The LambdaKB LT6C is a re-creation of the Ploopy Adept PCB and case as an easy to build DIY kit. The main goal was to build it using only off-the-shelf part and components that can be hand soldered relatively easily.

We set out to create a more affordable alternative to the original Adept trackball while retaining all its features, primarily for individuals in regions where purchasing the original kit isn't cost-effective (for example, shipping from the Ploopy store to Europe costs over €35 before import taxes).

Trackball lt6c, from the project README
From the project README

Main components on the Trackball lt6c

XIAO-RP2040TPS76318PMW3360DM-T2QU

Trackball lt6c bill of materials (BOM)

15 components, 9 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
XIAO-RP2040
U1
1
TPS76318
U2
1
PMW3360DM-T2QU
U3
6
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6
1
1UF
1uF
C1
2
4.7UF
4.7uF
C2, C3
1
100NF
100nF
C4
1
10K
R1
1
39R
R2

Trackball lt6c design files

The KiCad project lives in the lambdakb/trackball-lt6c repository on GitHub; these links point at the commit this page was built from.

Trackball lt6c: common questions

What microcontroller does the Trackball lt6c use?

The Trackball lt6c is built around the XIAO-RP2040, from the RP2040/RP2350 family.

How big is the Trackball lt6c PCB?

The Trackball lt6c measures 62 × 66.4 mm, has 2 copper layers and is 0.8 mm thick.

How many components are on the Trackball lt6c?

15 components, from 9 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 Trackball lt6c design files?

From the lambdakb/trackball-lt6c 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 Trackball lt6c design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which lambdakb chose for the repository.

Can I test firmware for the Trackball lt6c 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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