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2 layers46.7 × 32.1 mmCrownTouch, the printed circuit board in 3D

CrownTouch

moxdlab/CapCrown

Petersen, David; Reuter, Marvin; Böhmer, Matthias: CapCrown: Enhancing Smartwatch Interaction by Detecting Fingers when Rotating the Crown Using Capacitive Sensing.

Open in PCBKitView on GitHub.kicad_pcb
Size
46.7 × 32.1 mm
Copper layers
2
Thickness
0.09 mm
Parts
9
Nets
31
Pads
72
Tracks, vias
170, 12
Pours
10
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
12 May 2026
Updated
29 May 2026

Overview

CrownTouch is an open-source printed circuit board by moxdlab, from the moxdlab/CapCrown repository on GitHub. It is a 2-layer board of 46.7 × 32.1 mm with 9 parts on 31 nets, routed with 170 tracks and 12 vias.

README

readme.md

This repo contains:

  • kicad data for custom pcb sensor
  • firmware for esp
  • applications for smartwatch
  • jupyter notebook for informative study
  • jupyter notebook for model training (+ model)
  • study data
  • 3d print stl files

Paper

Petersen, David; Reuter, Marvin; Böhmer, Matthias: CapCrown: Enhancing Smartwatch Interaction by Detecting Fingers when Rotating the Crown Using Capacitive Sensing. In: Proceedings of the ACM on Human-Computer Interaction, vol. 10, no. 4, 2026. https://doi.org/10.1145/3812770

Parts

9
QtyValueFootprintReferences
8~CrownTouch:Touchpad_BasicTp1, Tp2, Tp3, Tp4, Tp5, Tp6, Tp7, Tp8
1Trill FlexTRILL:trill_flex_connector_longJ1

Questions

How big is the CrownTouch PCB?

It measures 46.7 × 32.1 mm and has 2 copper layers, 0.09 mm thick.

What parts does the CrownTouch use?

9 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the CrownTouch KiCad files?

From the moxdlab/CapCrown repository on GitHub, at the commit this page was made from: the board is pcb sensor/CrownTouch.kicad_pcb and its schematic pcb sensor/CrownTouch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the CrownTouch design in my own project?

Its repository states no licence, so its author keeps all rights: ask moxdlab before reusing the design.

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