HardLabs

Combadge

Pippadi·combadge·hardware/pcb/Combadge.kicad_pcb

Combadge PCB layout, top view — open source ESP32 board by Pippadi

About the Combadge PCB

Combadge is an open source ESP32 PCB design by Pippadi, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 33.7 × 31 mm, with 34 components from 24 distinct parts.

Its main chip is the ESP32-S3-WROOM-1, from the ESP32 family. Other key parts include the MCP73831-2-OT, TLV431AQFTA, TLV73333PDBV and MAX98357AETE+T. By type, the board carries 12 resistors, 10 capacitors, 5 ICs, 3 switches, 2 diodes and 1 connector.

It belongs with the audio and power & battery designs in this gallery.

From the project

A Star Trek combadge built with the ESP32-S3

See the assets directory for screenshots of the schematics and PCB.

The combadge is built around an ESP32-S3-WROOM-1.

- It has hardware I2S and touch support - It is well-supported by the Arduino toolchain - It is cheaply available in my region

I've chosen to adopt I2S peripherals for this project, as they promise better audio quality than their analog counterparts, while reducing the amount of analog circuitry I have to design. The ESP32-S3 supports two I2S peripherals in hardware.

Combadge, from the project README
From the project README

Main components on the Combadge

MCP73831-2-OTTLV431AQFTATLV73333PDBVESP32-S3-WROOM-1MAX98357AETE+T

Combadge bill of materials (BOM)

34 components, 24 distinct parts.

QtyPartRefs
1
MCP73831-2-OT
U1
1
TLV431AQFTA
U2
1
TLV73333PDBV
U3
1
ESP32-S3-WROOM-1
U4
1
MAX98357AETE+T
U5
1
USB_B_Micro
J1
1
SPH0645LM4H
MK1
1
SW_SPDT
SW1
1
BOOT
SW2
1
EN
SW3
2
LED
D1, D2
2
4.7uF
C1, C2
3
1uF
C3, C6, C7
2
10uF
C4, C10
2
0.1uF
C5, C9
1
0.2uF
C8
1
4k
R1
2
150
R2, R6
1
220k
R3
1
120k
R4
Show 4 more
QtyPartRefs
3
10k
R5, R7, R8
2
100k
R9, R11
1
50
R10
1
1k
R12

Combadge design files

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

Combadge: common questions

What microcontroller does the Combadge use?

The Combadge is built around the ESP32-S3-WROOM-1, from the ESP32 family.

How big is the Combadge PCB?

The Combadge measures 33.7 × 31 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Combadge?

34 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the Combadge design files?

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

Can I use the Combadge design in my own project?

Yes, under the terms of its GPL-3.0 license, which Pippadi chose for the repository.

Can I test firmware for the Combadge 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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