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ESP32 Engine

Bad-Dog-Designs·ESP32-S3-Synthesizer·Engine_Board/ESP32_Engine/ESP32_Engine.kicad_pcb

ESP32 Engine PCB layout, top view — open source ESP32 board by Bad-Dog-Designs

About the ESP32 Engine PCB

ESP32 Engine is an open source ESP32 PCB design by Bad-Dog-Designs, published on GitHub. It is a 2-layer board measuring 229 × 96 mm, with 48 components from 26 distinct parts.

Its main chip is the ESP32-S3, from the ESP32 family. Other key parts include the PCM5102AQPWRQ1, MIC5323-3.3YD5-TR, MCP2562-H-P and H11L1. By type, the board carries 23 capacitors, 13 resistors, 6 ICs, 5 connectors and 1 diode.

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

From the project

Source code and KiCad Files for the build of an ESP32 S3 Based synthesizer. CAN bus is used extensively to collect all the pots and switch data and send to the ESP32 engine

Project overview: A custom polyphonic synthesizer built around an ESP32-S3 audio engine communicating with multiple ATmega328p control boards via CAN bus at 500kbps. All boards share synth_params.h as the single source of truth for CAN message definitions. Hardware boards:

ESP32-S3 — audio engine, MIDI input, I2S DAC output, CAN master Oscillator boards (ATmega328p, up to 4) — dual oscillator control per board, board ID set by hardware jumpers (both open = board 0) Commons board (ATmega328p) — filter, envelope, LFO, ring mod, play mode controls Routing board (ATmega328p) — modulation matrix…

Main components on the ESP32 Engine

PCM5102AQPWRQ1MIC5323-3.3YD5-TRESP32-S3MCP2562-H-PH11L1

ESP32 Engine bill of materials (BOM)

48 components, 26 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
PCM5102AQPWRQ1
IC2
1
MIC5323-3.3YD5-TR
3v3 Digital Reg
IC3
1
MIC5323-3.3YD5-TR
3v3 Analogue Reg
IC4
1
ESP32-S3
U1
1
MCP2562-H-P
U2
1
H11L1
U3
1
503398-1892
J1
1
Midi in
J2
1
Output
J3
1
Input
J4
1
AUDIOJACK3
AudioJack3
J5
1
1N4148
D1
7
100NF
100nF
C1, C2, C6, C10, C16, C18, C23
2
2U2
2u2
C3, C4
4
10UF
10uF
C5, C7, C17, C19
3
100NF
100nF
C8, C9, C21
2
2.2NF
2.2nF
C11, C12
2
2.2UF
2.2uF
C13, C14
1
100UF
100uF
C15
1
4U7
4u7
C20
Show 6 more
QtyPartRefs
1
100NF
100nF
C22
3
22R
R1, R2, R3
3
470R
R4, R5, R12
5
10K
10k
R6, R7, R8, R9, R10
1
220R
R11
1
120R
R28

ESP32 Engine design files

The KiCad project lives in the Bad-Dog-Designs/ESP32-S3-Synthesizer repository on GitHub; these links point at the commit this page was built from.

ESP32 Engine: common questions

What microcontroller does the ESP32 Engine use?

The ESP32 Engine is built around the ESP32-S3, from the ESP32 family.

How big is the ESP32 Engine PCB?

The ESP32 Engine measures 229 × 96 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ESP32 Engine?

48 components, from 26 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 ESP32 Engine design files?

From the Bad-Dog-Designs/ESP32-S3-Synthesizer 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 ESP32 Engine design in my own project?

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

Can I test firmware for the ESP32 Engine 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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