HardLabs

Fancy node

candykingdom·firefly2·hardware/fancy-node/fancy-node.kicad_pcb

Fancy node PCB layout, top view — open source STM32 board by candykingdom

About the Fancy node PCB

Fancy node is an open source STM32 PCB design by candykingdom, published on GitHub. It is a 4-layer board measuring 47.1 × 30.7 mm, with 66 components from 36 distinct parts.

Its main chip is the STM32G070CBTX, from the STM32 family. Other key parts include the CH340X, WS2812B, HT75XX-1-SOT89, RFM69CW-915MHZ and TP4056. By type, the board carries 19 resistors, 18 capacitors, 8 diodes, 7 connectors, 6 ICs and 4 switches.

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

From the project

Small blinkenlight boards that sync up using radios

Wireless LED control for Burning Man art installations, bikes, and wearables. Devices driving WS2812 strips self-organize over 915 MHz RFM69 radios into a flood mesh with exactly one master, share a network clock via heartbeats, and render effects as pure functions of network time — so every device animates in sync without streaming frames.

New to the project? Start with GETTING_STARTED.md. Working in the code (human or agent)? The mental model lives in docs/index.md and the shared Claude Code/Codex ground rules in CLAUDE.md.

Main components on the Fancy node

CH340XWS2812BHT75XX-1-SOT89RFM69CW-915MHZTP4056STM32G070CBTX

Fancy node bill of materials (BOM)

66 components, 36 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
CH340X
U1
1
WS2812B
WS2812b
U3
1
HT75XX-1-SOT89
HT75xx-1-SOT89
U4
1
RFM69CW-915MHZ
U5
1
TP4056
U6
1
STM32G070CBTX
STM32G070CBTx
U7
1
C132563
USB_B_Micro
J1
1
Conn_01x06
J2
1
Conn_01x03
J3
1
Conn_01x03
J4
1
Conn_01x04
J5
1
Conn_01x02
J6
1
2337019-1
J7
1
StrainRelief
H1
1
SolderJumper_2_Open
JP2
3
SW_Push
SW1, SW2, SW3
1
C2909229
SW_SPDT
SW4
1
C89650
Thermistor_PTC
TH1
2
C2286
RED
D1, D7
1
SRV05-4-P-T7
D2
Show 16 more
QtyPartRefs
3
C78395
D_TVS
D3, D4, D5
1
C2290
WHITE
D6
1
C8678
D
D8
1
33NH
27nH
L1
8
100NF
100nF
C1, C2, C3, C5, C7, C9, C13, C15
7
10UF
10uF
C4, C6, C8, C11, C12, C16, C18
2
47UF
47uF
C10, C14
1
1pF
C17
11
1k
R1, R2, R3, R4, R5, R6, R7, R12 +3
1
4K7
4k7
R8
1
470
R9
1
62K
62k
R10
1
180K
180k
R11
1
3K3
3k3
R14
2
220
R16, R19
1
10K
10k
R18

Fancy node design files

The KiCad project lives in the candykingdom/firefly2 repository on GitHub; these links point at the commit this page was built from.

Fancy node: common questions

What microcontroller does the Fancy node use?

The Fancy node is built around the STM32G070CBTX, from the STM32 family.

How big is the Fancy node PCB?

The Fancy node measures 47.1 × 30.7 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Fancy node?

66 components, from 36 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 Fancy node design files?

From the candykingdom/firefly2 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 Fancy node design in my own project?

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

Can I test firmware for the Fancy node without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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