HardLabs

Touch volume controller

akmalbnazir·touch_volume_controller

Touch volume controller PCB layout, top view — open source RP2040/RP2350 board by akmalbnazir

About the Touch volume controller PCB

Touch volume controller is an open source RP2040/RP2350 PCB design by akmalbnazir, published on GitHub. It is a 2-layer board measuring 26.8 × 59.6 mm, with 17 components from 14 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. By type, the board carries 5 capacitors, 5 resistors, 2 connectors, 2 diodes, 1 IC and 1 crystal.

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

From the project

A modern, USB-powered capacitive volume controller that uses a single touchpad and an RGB LED to simulate digital volume control behavior. Built with the RP2040 microcontroller, this project integrates capacitive sensing, RGB visual feedback, and optional OLED display output — al

A modern, USB-powered capacitive volume controller that uses a single touchpad and an RGB LED to simulate digital volume control behavior. Built with the RP2040 microcontroller, this project integrates capacitive sensing, RGB visual feedback, and optional OLED display output — all designed in KiCad.

- 🖐️ Capacitive touch input (single-point) - 🌈 WS2812B RGB LED for visual feedback - ⚡ USB-C powered (with fuse and Schottky protection) - 🧠 RP2040 microcontroller core - 🖥️ Optional 0.96" I²C OLED header - 🧩 Beginner-friendly, surface-mount layout (SMD)

Touch volume controller, from the project README
From the project README

Main components on the Touch volume controller

RP2040

Touch volume controller bill of materials (BOM)

17 components, 14 distinct parts.

QtyPartRefs
1
RP2040
U1
1
Crystal
Y1
1
USB_C_Receptacle_USB2.0_16P
J1
1
Conn_01x04
J2
1
Fuse
F1
1
D_Schottky
D1
1
WS2812B
D2
3
0.1µF
C1, C3, C4
1
1µF
C2
1
100µF
C5
1
10kΩ
R1
1
1MΩ
R2
1
330Ω
R3
2
4.7kΩ
R4, R5

Touch volume controller design files

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

Touch volume controller: common questions

What microcontroller does the Touch volume controller use?

The Touch volume controller is built around the RP2040, from the RP2040/RP2350 family.

How big is the Touch volume controller PCB?

The Touch volume controller measures 26.8 × 59.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Touch volume controller?

17 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the Touch volume controller design files?

From the akmalbnazir/touch_volume_controller repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Touch volume controller design in my own project?

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

Can I test firmware for the Touch volume controller 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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