HardLabs

Bramble

justinlindh·bramble·hardware/pager/v1/kicad/pager.kicad_pcb

Bramble PCB layout, top view — open source ESP32 board by justinlindh
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About the Bramble PCB

Bramble is an open source ESP32 PCB design by justinlindh, published on GitHub under the MIT license. It is a 2-layer board measuring 96 × 50 mm, with 84 components from 42 distinct parts.

Its main chip is the ESP32-S3-WROOM-1-N8R2, from the ESP32 family. Other key parts include the USBLC6-2SC6, TP4056-42, DW01A, FS8205A and XC6220B331MR-G. By type, the board carries 26 capacitors, 21 resistors, 8 ICs, 7 diodes, 5 transistors and 4 switches.

It belongs with the rf & radio, displays & leds and power & battery designs in this gallery.

From the project

Privacy-first LoRa mesh networking for ESP32-S3, built with ESP-IDF

A full Bramble mesh node (TX-capable; the mesh has no receive-only role) built into a 90s-pager formfactor: always-readable 2.13" e-paper, 1S LiPo with USB-C charge and load-share, magnetic buzzer plus coin vibration motor, and a 3D-printed enclosure. It runs stock Bramble firmware as a new board target (bramblepager`) that reuses every Heltec-V3 pin assignment legal on an ESP32-S3-WROOM-1, adds an SSD1680 e-paper display, and carries an ATGM336H GNSS receiver. Board is ~96x50mm landscape, 2-layer 1.6mm, built for JLCPCB economic PCBA. This directory is the source of truth for the design.

Main components on the Bramble

USBLC6-2SC6TP4056-42DW01AFS8205AXC6220B331MR-GLORA1262-915TCXOATGM336H-5N31ESP32-S3-WROOM-1-N8R2

Bramble bill of materials (BOM)

84 components, 42 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
USBLC6-2SC6
U101
1
TP4056-42
U102
1
DW01A
U103
1
FS8205A
U104
1
XC6220B331MR-G
U105
1
LORA1262-915TCXO
LoRa1262-915TCXO
U201
1
ATGM336H-5N31
U202
1
ESP32-S3-WROOM-1-N8R2
U401
2
AO3401A
Q101, Q201
3
AO3400A
Q301, Q401, Q402
2
C496552
u.FL BWIPX-1-001E
ANT1, ANT2
1
C295747
JST-PH BATT
BATT1
1
MLT-8530
BZ1
1
FH34SRJ-24S
EPD1
1
I2C debug (DNP option)
I2C1
1
C318884
TS-1187A RESET
SW401
1
C318884
TS-1187A BOOT
SW402
1
C318884
TS-1187A DOWN
SW403
1
C318884
TS-1187A UP
SW404
1
TYPE-C-31-M-12
USBC1
Show 22 more
QtyPartRefs
1
C265284
vibra JST-ZH
VIB1
1
C2286
red CHRG
LED101
1
C965805
green STDBY
LED102
1
C2286
red
LED401
1
SS34
D101
4
B5819W
D201, D301, D302, D303
2
SS14
D401, D402
1
47NH
47nH
L201
1
47UH
47uH
L301
7
10UF
10uF
C101, C102, C104, C105, C201, C204, C401
7
100NF
100nF
C106, C107, C202, C205, C402, C404, C405
3
C1779
4.7uF 25V
C203, C301, C302
8
C15849
1uF 50V
C303, C304, C305, C306, C307, C308, C309, C310
1
1UF
1uF
C403
2
5.1K
5.1k
R101, R102
1
2.2K
2.2k
R103
3
1k
R104, R105, R406
3
100R
R106, R402, R403
5
100K
100k
R107, R108, R109, R201, R202
1
1M
R301
1
C2933402
2.2R 1%
R302
5
10K
10k
R401, R404, R405, R407, R408

Bramble design files

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

Bramble: common questions

What microcontroller does the Bramble use?

The Bramble is built around the ESP32-S3-WROOM-1-N8R2, from the ESP32 family.

How big is the Bramble PCB?

The Bramble measures 96 × 50 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Bramble?

84 components, from 42 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 Bramble design files?

From the justinlindh/bramble 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 Bramble design in my own project?

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

Can I test firmware for the Bramble 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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