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GSwitch BRAIN - ESP32-S3 hoofdbord

MarkWestbroek·MusicBrain·hardware/schematics/gswitch-brain/gswitch-brain.kicad_pcb

GSwitch BRAIN - ESP32-S3 hoofdbord PCB layout, top view — open source ESP32 board by MarkWestbroek

About the GSwitch BRAIN - ESP32-S3 hoofdbord PCB

GSwitch BRAIN - ESP32-S3 hoofdbord is an open source ESP32 PCB design by MarkWestbroek, published on GitHub under the MIT license. It is a 2-layer board measuring 100 × 70 mm, with 65 components from 50 distinct parts.

Its main chip is the ESP32-S3-WROOM-1U-N8R2, from the ESP32 family. Other key parts include the R-78E5.0-1.0, AMS1117-3.3, 74HC154 and 74HC165. By type, the board carries 26 resistors, 13 capacitors, 11 connectors, 6 ICs, 4 diodes and 2 switches.

It belongs with the audio designs in this gallery.

From the project

A central brain running on teensy or a lighter MCU to process any control signals (MIDI, CV, our own) into the same but adding logic, ADSRs, DCOs, CV matrices etc. to it

Status: rev 0.1 geroute — ERC 0, netcheck OK, DRC 0/0 (2026-07-12). Nog niet bestellen: eerst jlcfix.py-LCSC-match + fab-pakket + review. Leidende spec: doc/guitar-switcher-spec.md`.

(Regenereren: python hardware/kicad-generators/boardoverview.py gswitch-brain-overzicht.json — 3D-render via kicad-cli met callouts in bord-mm.)*

Het "moederbord" van de switcher: ESP32-S3-WROOM-1U (U.FL-antenne → SMA-bulkhead op de stalen kast), 12V center-negatief in (omkeer-P-FET + polyfuse + SMAJ15A), buck 12→5V (TPS563201), AMS1117-3.3, USB-C voor flash/debug (SS34-diode naar de 5V-rail: bord draait op USB…

Main components on the GSwitch BRAIN - ESP32-S3 hoofdbord

ESP32-S3-WROOM-1U-N8R2R-78E5.0-1.0AMS1117-3.374HC15474HC165

GSwitch BRAIN - ESP32-S3 hoofdbord bill of materials (BOM)

65 components, 50 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-S3-WROOM-1U-N8R2
U1
1
R-78E5.0-1.0
74HCT541
U2
1
AMS1117-3.3
74HCT14
U3
1
74HC154
H11L1
U4
1
74HC165
AMS1117-3.3
U5
1
74HC165
TPS563201
U6
1
AO3401
Q1
1
C22373917
DC-12V
J1
1
C22373917
USB-C
J2
2
C22373917
SDS-50J
J3, J4
1
C22373917
OLED-I2C
J5
1
C22373917
KNOPPEN
J6
1
C5665
ENCODER
J7
1
C5665
SPARE
J8
1
C5665
DEBUG
J9
1
C492424
RJ45-S
J10
1
C225484
RJ45-S
J11
1
1.1A
F1
1
RESET
SW1
1
BOOT
SW2
Show 30 more
QtyPartRefs
1
1N4148WS
SMAJ15A
D1
1
1N4148WS
SS34
D2
1
BAT54S
1N4148W
D3
1
LED-GN
D4
1
4u7
L1
1
10U
10u
C1
4
100N
100n
C2, C11, C12, C13
2
10U
100n
C3, C7
3
100N
22u
C4, C6, C8
1
10U
22u
C5
1
220P
100n
C9
1
100N
1u
C10
1
33R
56k
R1
1
33R
10k
R2
1
2K2
100k
R3
1
2K2
33k
R4
1
10K
10k
R5
1
220R
1k
R6
1
220R
4k7
R7
1
4k7
R8
1
220R
R9
1
10R
220R
R10
1
33R
220R
R11
1
120R
1k
R12
1
10K
100R
R13
2
100K
100R
R14, R15
5
33R
100R
R16, R17, R18, R19, R20
2
100K
10k
R21, R22
2
100K
15k
R23, R24
2
100K
5k1
R25, R26

GSwitch BRAIN - ESP32-S3 hoofdbord design files

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

GSwitch BRAIN - ESP32-S3 hoofdbord: common questions

What microcontroller does the GSwitch BRAIN - ESP32-S3 hoofdbord use?

The GSwitch BRAIN - ESP32-S3 hoofdbord is built around the ESP32-S3-WROOM-1U-N8R2, from the ESP32 family.

How big is the GSwitch BRAIN - ESP32-S3 hoofdbord PCB?

The GSwitch BRAIN - ESP32-S3 hoofdbord measures 100 × 70 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the GSwitch BRAIN - ESP32-S3 hoofdbord?

65 components, from 50 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 GSwitch BRAIN - ESP32-S3 hoofdbord design files?

From the MarkWestbroek/MusicBrain 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 GSwitch BRAIN - ESP32-S3 hoofdbord design in my own project?

Yes, under the terms of its MIT license, which MarkWestbroek chose for the repository.

Can I test firmware for the GSwitch BRAIN - ESP32-S3 hoofdbord without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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