HardLabs

Simple earring

sequoia-hope·simple-earring·out/earring.kicad_pcb

Simple earring PCB layout, top view — open source RP2040/RP2350 board by sequoia-hope

About the Simple earring PCB

Simple earring is an open source RP2040/RP2350 PCB design by sequoia-hope, published on GitHub. It is a 4-layer board measuring 30.5 × 35.7 mm, with 120 components from 27 distinct parts.

Its main chip is the RP2350A, from the RP2040/RP2350 family. Other key parts include the LGS4056H, NCP730-3.3, TPS22913, USBLC6-2P6 and LSM6DS3TR-C. By type, the board carries 48 capacitors, 45 LEDs, 14 resistors, 7 ICs, 2 switches and 1 crystal.

From the project

Co-designed LED earring: RP2354A + LIR2032 rechargeable coin cell + TBA-C1010 addressable RGB LEDs around the periphery. 4-layer, JLCPCB rules, all parts from LCSC.

Co-designed LED earring: RP2354A + LIR2032 rechargeable coin cell + TBA-C1010 addressable RGB LEDs around the periphery. 4-layer, JLCPCB rules, all parts from LCSC.

The design is generated: edit design.yaml (shape, LED count, sizes) and scripts/circuit.py (netlist), then rebuild.

Stages (each is also runnable standalone from scripts/):

Outputs land in out/ (earring.kicadpcb, renders, gerbers/, jlcpcb/`).

Main components on the Simple earring

RP2350ALGS4056HNCP730-3.3TPS22913USBLC6-2P6LSM6DS3TR-CW25Q16JVUXIQ

Simple earring bill of materials (BOM)

120 components, 27 distinct parts.

QtyPartRefs
1
RP2350A
U1
1
LGS4056H
U2
1
NCP730-3.3
U3
1
TPS22913
U4
1
USBLC6-2P6
U5
1
LSM6DS3TR-C
U6
1
W25Q16JVUXIQ
U7
1
12MHz
Y1
1
USB-C
J1
1
LIR2032
BT1
1
BOOTSEL
SW1
1
PWR
SW2
45
SK6805-EC10
LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +37
1
3.3uH
L1
37
100n
C1, C2, C3, C4, C5, C6, C7, C8 +29
4
4.7u
C11, C12, C13, C22
2
15p
C14, C15
3
10u
C16, C17, C20
2
1u
C18, C19
2
1k
R1, R3
Show 7 more
QtyPartRefs
2
10k
R2, R10
2
5.1k
R4, R5
2
27
R6, R7
1
22k
R8
2
1M
R11, R12
1
33
R13
2
4.7k
R14, R15

Simple earring design files

The KiCad project lives in the sequoia-hope/simple-earring repository on GitHub; these links point at the commit this page was built from.

Simple earring: common questions

What microcontroller does the Simple earring use?

The Simple earring is built around the RP2350A, from the RP2040/RP2350 family.

How big is the Simple earring PCB?

The Simple earring measures 30.5 × 35.7 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Simple earring?

120 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the Simple earring design files?

From the sequoia-hope/simple-earring repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Simple earring design in my own project?

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

Can I test firmware for the Simple earring 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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