4 layers24.5 × 69.7 mm TouchSensor, the printed circuit board in 3D

TouchSensor

DIY Project, involves STM32F411 as Macropad and STM32F334 as TouchSlider, not finished yet

Size: 24.5 × 69.7 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 88
Nets: 83
Pads: 306
Tracks, vias: 667, 63
Pours: 3
Routed: Yes
KiCad: KiCad 8.0 (file 20240108)
Created: 17 Nov 2025
Updated: 24 Feb 2026

Overview

TouchSensor is an open-source printed circuit board by janrenegradwohl, from the janrenegradwohl/Macropad repository on GitHub. It is a 4-layer board of 24.5 × 69.7 mm with 88 parts on 83 nets, routed with 667 tracks and 63 vias.

It is built around the WS2812B, 103P012BB100 and BC847BS,115. Its parts include 43 capacitors, 32 diodes, 4 resistors, 3 connectors and 1 IC. It belongs with the keyboards and input boards and the STM32 boards of this library.

Main components

README

README.md

Macropad

I wanted to create a Macropad with 12 Buttons and a Scroll-Wheel. Currently Working on other projects.

Parts

Qty	Value	Footprint	References
35	10nF	Capacitor_SMD:C_0402_1005Metric	C104, C110, C111, C112, C113, C114, C115, C116, C117, C118, C119, C120, C121, C122, C123, C124 +19
32	WS2812B	XINGLIGHT-XL-1515RGBC-WS2812B:XINGLIGHT XL-1515RGBC-WS2812B	LED101, LED102, LED103, LED104, LED105, LED106, LED107, LED108, LED109, LED110, LED111, LED112, LED113, LED114, LED115, LED116 +16
3	100nF	Capacitor_SMD:C_0603_1608Metric	C101, C102, C103
3	MountingHole	MountingHole:MountingHole_2.2mm_M2	H101, H102, H103
2	10k	Resistor_SMD:R_0402_1005Metric	R103, R104
2	2.2k	Resistor_SMD:R_0402_1005Metric	R101, R102
2	2uF	Capacitor_SMD:C_0603_1608Metric	C106, C107
2	Sampling	Capacitor_SMD:C_0805_2012Metric	C108, C109
1	103P012BB100	103P012BB100:AMPHENOL_103P012BB100	J103
1	1uF	Capacitor_SMD:C_0603_1608Metric	C105
1	BC847BS,115	BC847BS:SOT65P210X110-6N	Q101
1	Conn_01x04_Pin	PogoPin_01x04:PogoPin_01x04 wout holes	J101
1	Conn_01x05_Pin	CDSB_4x1:TSL_5	J102
1	NetTie_2	NetTie_Custom:NetTie-2_SMD_Pad0.25mm	NT101
1	STM32F334C8Tx	Package_QFP:LQFP-48_7x7mm_P0.5mm	U102

Questions

How big is the TouchSensor PCB?

It measures 24.5 × 69.7 mm and has 4 copper layers, 1.6 mm thick.

What parts does the TouchSensor use?

88 parts, built around the WS2812B, 103P012BB100 and BC847BS,115. 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 TouchSensor KiCad files?

From the janrenegradwohl/Macropad repository on GitHub, at the commit this page was made from: the board is Hardware/TouchSensor/TouchSensor.kicad_pcb and its schematic Hardware/AxialMotor/AxialMotor/AxialMotor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the TouchSensor design in my own project?

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

Category and platform

Keyboards and input STM32

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/janrenegradwohl-macropad-touchsensor" title="TouchSensor in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/janrenegradwohl-macropad-touchsensor.jpg" alt="TouchSensor" width="1200" height="900">

A picture that opens the board, for a README

[![TouchSensor](https://pcbkit.io/embed/boards/janrenegradwohl-macropad-touchsensor.jpg?size=s)](https://pcbkit.io/boards/janrenegradwohl-macropad-touchsensor)

Source

Repository: janrenegradwohl/Macropad
Board file: Hardware/TouchSensor/TouchSensor.kicad_pcb
Commit: 22f2020
Licence: Not stated

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