HardLabs

Bramble

erikbeerepoot·bramble·schematics/bramble/bramble-main/bramble.kicad_pcb

Bramble PCB layout, top view — open source RP2040/RP2350 board by erikbeerepoot

About the Bramble PCB

Bramble is an open source RP2040/RP2350 PCB design by erikbeerepoot, published on GitHub. It is a 2-layer board measuring 72.2 × 70.7 mm, with 82 components from 51 distinct parts.

Its main chip is the RP2350_80QFN, from the RP2040/RP2350 family. Other key parts include the C2902316, STM32L031F6P6TR, MCP1700X-120XXMB, FM24CL16B-GTR and C5356643. By type, the board carries 27 capacitors, 23 resistors, 8 ICs, 8 connectors, 3 jumpers and 2 crystals.

It belongs with the rf & radio and sensors designs in this gallery.

From the project

Bramble: Precision Agriculture Mesh

LoRa sensor and actuator network for farm monitoring, built on RP2040.

Hub-and-spoke architecture: a central hub manages the network while nodes collect sensor data (temperature, humidity) and control actuators (irrigation valves). LoRa provides long-range wireless with reliable delivery guarantees.

- Adafruit Feather RP2040 LoRa (SX1276, 915 MHz) - MT25QL01GBBB 128MB external flash for sensor data storage - STM32L010 PMU for power management and sleep

Main components on the Bramble

C2902316STM32L031F6P6TRMCP1700X-120XXMBFM24CL16B-GTRC5356643RP2350_80QFNW25Q16JVSSMT25QL01GBBB8ESF-0SIT

Bramble bill of materials (BOM)

82 components, 51 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C2902316
Opamp_Quad
U1
1
STM32L031F6P6TR
U2
1
MCP1700X-120XXMB
MCP1700x-120xxMB
U3
1
FM24CL16B-GTR
U4
1
C5356643
NiceRF Lora1262
U5
1
RP2350_80QFN
U6
1
W25Q16JVSS
U7
1
MT25QL01GBBB8ESF-0SIT
U8
1
Crystal
Y1
1
ABM8-272-T3
Y2
1
CONN_01X05_PIN
Conn_01x05_Pin
J1
1
C160389
UART
J2
1
C160389
RPI SWD
J3
1
U.FL
J4
1
USB_C_RECEPTACLE_USB2.0_16P
USB_C_Receptacle_USB2.0_16P
J5
1
GPIO1
J6
1
GPIO2
J7
1
GPIO3
J8
1
Series
JP1
1
Parallel 1
JP2
Show 31 more
QtyPartRefs
1
Parallel 2
JP3
2
B2B-PH-K-S
MAIN_SUPPLY1, PMU_SUPPLY1
1
STM_RESET
STM_RESET1
1
STM_WAKE
STM_WAKE1
1
C528967
BOOT
SW1
1
C528967
RESET
SW2
1
TPSM861253RDXR
VR1
2
WS2812B-2020
PMU_STATUS1, RPI_STATUS1
1
1N4148W
D1
1
3.3UH
3.3uH
L1
1
10UF
10uF
C1
1
22UF
22uF
C2
1
4.7UF
4.7uF
C3
3
100NF
100nF
C4, C5, C8
2
1UF
1uF
C6, C7
2
10PF
10pF
C9, C10
4
4.7UF
4.7uF
C11, C12, C14, C15
11
100NF
100nF
C13, C16, C17, C18, C19, C20, C21, C22 +3
2
15P
15p
C25, C26
3
1k
R1, R3, R6
1
100
R2
1
0.1
R4
3
10K
10k
R5, R9, R10
1
20K
20k
R7
1
8.2K
8.2k
R8
3
10K
10k
R11, R12, R23
1
33
R13
2
100
R14, R15
4
1K
R16, R17, R21, R22
2
27
R18, R19
1
5.1K
R20

Bramble design files

The KiCad project lives in the erikbeerepoot/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 RP2350_80QFN, from the RP2040/RP2350 family.

How big is the Bramble PCB?

The Bramble measures 72.2 × 70.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Bramble?

82 components, from 51 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 erikbeerepoot/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?

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

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 RP2040/RP2350 firmware against it before you order a PCB.

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