HardLabs

Rfboard

candykingdom·firefly2·hardware/rfboard/rfboard.kicad_pcb

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

About the Rfboard PCB

Rfboard is an open source STM32 PCB design by candykingdom, published on GitHub. It is a 4-layer board measuring 21 × 63 mm, with 67 components from 29 distinct parts.

Its main chip is the STM32G070KBTX, from the STM32 family. Other key parts include the RFM69HCW, CH340X, XL-0807RGBC-WS2812B, AP2112K-3.3 and C42371120. By type, the board carries 29 capacitors, 15 resistors, 7 diodes, 6 ICs, 4 connectors and 3 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 Rfboard

STM32G070KBTXRFM69HCWCH340XXL-0807RGBC-WS2812BAP2112K-3.3C42371120

Rfboard bill of materials (BOM)

67 components, 29 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32G070KBTX
STM32G070KBTx
U1
1
RFM69HCW
U2
1
CH340X
U3
1
XL-0807RGBC-WS2812B
U4
1
AP2112K-3.3
U5
1
C42371120
HX 1210-C06
U6
1
10118194-0001LF
J1
1
2337019-1
J3
1
Conn_01x02
J4
1
CONN_01X03
P2
1
STRAIN_RELIEF
H3
3
SW_Push
SW1, SW2, SW3
5
ESD5Z5.0
D1, D4, D5, D6, D7
1
C2286
RED
D2
1
SRV05-4-P-T7
D3
2
0
L1, L2
16
100NF
100nF
C1, C2, C3, C4, C5, C8, C11, C13 +8
6
10UF
10uF
C6, C9, C12, C14, C17, C20
1
C17168
0R
C7
4
47UF
47uF
C10, C15, C19, C26
Show 9 more
QtyPartRefs
1
47PF
47pF
C24
1
220UF
220uF
C27
1
4K7
4k7
R1
4
1k
R2, R4, R7, R8
1
22K
22k
R3
2
470
R5, R6
4
10K
10k
R9, R10, R13, R15
1
15K
15k
R11
2
5K1
5k1
R12, R14

Rfboard design files

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

Rfboard: common questions

What microcontroller does the Rfboard use?

The Rfboard is built around the STM32G070KBTX, from the STM32 family.

How big is the Rfboard PCB?

The Rfboard measures 21 × 63 mm, has 4 copper layers and is 1.6062 mm thick.

How many components are on the Rfboard?

67 components, from 29 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 Rfboard 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 Rfboard 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 Rfboard 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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