a3-audio/a3-motion1The 4-channel motion sampler of A³ Audio. It records movements on a touchscreen sphere and plays them back in time with the beat, steering each channel's position on A³ Core over OSC.
Motion pcb is an open-source printed circuit board by a3-audio, from the a3-audio/a3-motion repository on GitHub. It is a 2-layer board of 201.2 × 190.3 mm with 251 parts on 215 nets, routed with 3,043 tracks and 223 vias.
It is built around the 74HC4051, SN74LVC1T45DBV and WS2812B-2020, with the BSS138 among its other parts. Its parts include 107 resistors, 59 ICs, 44 diodes, 34 capacitors and 1 transistor.
The 4-channel motion sampler of A³ Audio. It records movements on a touchscreen sphere and plays them back in time with the beat, steering each channel's position on A³ Core over OSC.
This repository holds the panel firmware (firmware/, ESP32-S3) and the PCB and
housing designs (hardware/; the boards in pcb/, one folder per revision: v1 the first boards (mainboard and button matrix), v3_1 the current one). The touchscreen app is
a3-motion-ui, wired in here as the
submodule a3-motion-ui (named ui until 2026-10-31: every submodule path is
now its repository's name).
Documentation: https://a3-audio.github.io/a3-doc/
A PlatformIO project for the esp32-s3-devkitc-1-n16r8. Run from firmware/:
pio run # build
pio run -t upload # flash
pio device monitor # serial monitor, 115200 baud
pio test -e native # host-side unit tests
python3 -m unittest test_hostUpload and monitor need no port. They find the panel by its USB ID, the CH343
bridge 1A86:55D3 (build.hwids in boards/esp32-s3-devkitc-1-n16r8.json).
host.py polls the firmware over serial and prints the decoded buttons,
encoders and pots (python3 host.py; needs pyserial). Its docstring lists
the options and describes the binary poll-frame protocol. Use it to tell a
firmware fault from a fault in the UI.
Motion UI runs on any Linux machine with a touchscreen, and the panel connects
to it over USB. It is tested on a NUC (on the rig, the Core machine) and was
first planned for a Raspberry Pi 5; see
Hardware
in the docs. The i3 config, the X rules and the user service are in the UI
repository, under
platform_config/.
REUSE-compliant: the licenses are in LICENSES/, which file has which is in
.reuse/dep5.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 57 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R12, R13, R14, R15, R16, R17, R22, R23, R24, R25, R26, R27, R100, R106 +41 |
| 44 | WS2812B-2020 | 3dAudioFoot:A3_CherryMxHybrid_WS2812Led2020 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +28 |
| 36 | ~ | 3dAudioFoot:a3_jumper_fix | U2, U10, U11, U12, U14, U15, U16, U18, U19, U20, U22, U23, U24, U26, U27, U28 +20 |
| 33 | 100nF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24 +17 |
| 25 | 1k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R10, R11, R20, R21, R31, R32, R36, R37, R43, R44, R50, R51, R104, R105, R109, R110 +9 |
| 24 | 10K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R18, R19, R29, R30, R34, R35, R41, R42, R48, R49, R56, R57, R102, R103, R107, R108 +8 |
| 12 | ~ | 3dAudioFoot:A3_ENC_POT_mix | U1, U5, U9, U13, U17, U21, U25, U29, U33, U37, U41, U49 |
| 9 | 74HC4051 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U43, U47, U48, U53, U54, U55, U56, U57, U59 |
| 6 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4, H5, H6 |
| 1 | 0 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R99 |
| 1 | 10v/1mF | Capacitor_SMD:CP_Elec_10x10 | C1 |
| 1 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | SN74LVC1T45DBV | Package_TO_SOT_SMD:SOT-23-6 | U42 |
| 1 | ~ | 3dAudioFoot:ESP32-S3-DevKitC-1 | IC1 |
a3-audio/a3-motion
The 4-channel motion sampler of A³ Audio. It records movements on a touchscreen sphere and plays them back in time with the beat, steering each channel's position on A³ Core over OSC.
a3-audio/a3-motion
The 4-channel motion sampler of A³ Audio. It records movements on a touchscreen sphere and plays them back in time with the beat, steering each channel's position on A³ Core over OSC.
a3-audio/a3-motion
The 4-channel motion sampler of A³ Audio. It records movements on a touchscreen sphere and plays them back in time with the beat, steering each channel's position on A³ Core over OSC.
a3-audio/a3-motion
The 4-channel motion sampler of A³ Audio. It records movements on a touchscreen sphere and plays them back in time with the beat, steering each channel's position on A³ Core over OSC.
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It measures 201.2 × 190.3 mm and has 2 copper layers, 1.6 mm thick.
251 parts, built around the 74HC4051, SN74LVC1T45DBV, WS2812B-2020 and BSS138. 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.
From the a3-audio/a3-motion repository on GitHub, at the commit this page was made from: the board is hardware/pcb/v3_1/motion_pcb.kicad_pcb and its schematic hardware/pcb/v1/a3motion_buttonmatrix_v01.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask a3-audio before reusing the design.