Firefly

intergalaktik·firefly·pcb/firefly.kicad_pcb

About the Firefly PCB

Firefly is an open source RP2040/RP2350 PCB design by intergalaktik, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 85 × 70.5 mm, with 50 components from 27 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the ADM2687EBRIZ and 497-6447-1. By type, the board carries 21 capacitors, 7 connectors, 7 diodes, 5 resistors, 3 ICs and 1 fuse.

From the project

Board is designed to run custom made panels designed by Novena.

Designed to drive LED strip WS28121/WS28121

Depending on components and jumpers board can be sender or receiver.

UTP Cables are cheap and easily available.

Sender board is connected over USB to computer.

Currently sender board is just use as USB > RS485 pass

On receiver board switches are used to set panel ID

Firefly, from the project README — From the project README

Main components on the Firefly

Pico ADM2687EBRIZ 497-6447-1

Firefly bill of materials (BOM)

50 components, 27 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	Pico	RPi_Pico_SMD_TH	U1
1	ADM2687EBRIZ ADM2687E	SOIC-16W_7.5x12.8mm_P1.27mm	U103
1	497-6447-1 AMS1117	SOT-223-3_TabPin2	U104
2	RJHSE-5380 RJ45_Shielded	RJ45_Amphenol_RJHSE5380	J1, J2
1	5787834-1 Conn_01x08	PinSocket_1x08_P2.54mm_Vertical	J3
1	Conn_01x08	PinSocket_1x08_P2.54mm_Vertical	J4
1	Conn_02x03_Counter_Clockwise	PinHeader_2x03_P2.54mm_Vertical	J101
1	Analog_1_2	PinHeader_2x03_P1.00mm_Vertical	J102
1	Analog_3_4	PinHeader_2x03_P1.00mm_Vertical	J103
1	338-2146-6 100µF 50V 27mΩ	CP_Elec_10x10	Cvin1
1	1727-1324-1 PESD5V0X1UAB	D_SOD-523	ESD1
1	F2941 Fuse DNP	Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder	F1
1	277-8657 MSTBA3	PhoenixContact_MSTBA_2,5_3-G-5,08_1x03_P5.08mm_Horizontal	Jadd1
1	1755736 MSTBA2 Phoenix Contact	PhoenixContact_MSTBA_2,5_2-G-5,08_1x02_P5.08mm_Horizontal	Jc1
1	311-1.0KGR 1k	R_0603_1608Metric	Radd1
1	CT2198MST SW_DIP_x08	DIP-16_W8.89mm_SMDSocket_LongPads	SW101
3	82306120029	D_0603_1608Metric	D101, D106, D107
1	MBR0530TPMS D_Schottky_Small	D_SOD-123	D102
1	160-1182-1 LED_3V	LED_0603_1608Metric	D103
2	160-1183-1 LED_5V	LED_0603_1608Metric	D104, D105

Show 7 more

Qty	Part	Footprint	Refs
1	10-16SVPT100M 100uF/16V	CP_Elec_6.3x5.3	C101
12	732-7965-6 100n	C_0603_1608Metric	C102, C103, C108, C113, C114, C117, C118, C119 +4
6	732-7959-6 10n	C_0603_1608Metric	C104, C105, C111, C112, C115, C116
2	1uF	C_0603_1608Metric	C109, C110
3	311-300GR 300	R_0603_1608Metric	R1, R2, R104
1	311-1.0KGR 1K	R_0603_1608Metric	R102
1	311-130HR 120R	R_0603_1608Metric	R105

Firefly design files

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

Firefly: common questions

What microcontroller does the Firefly use?

The Firefly is built around the Pico, from the RP2040/RP2350 family.

How big is the Firefly PCB?

The Firefly measures 85 × 70.5 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Firefly?

50 components, from 27 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 Firefly design files?

From the intergalaktik/firefly 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 Firefly design in my own project?

Yes, under the terms of its GPL-3.0 license, which intergalaktik chose for the repository.

Can I test firmware for the Firefly 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.