HardLabs

Dragonfly

Broccoliux·dragonfly·PCB/Dragonfly/.history/Dragonfly.kicad_pcb

Dragonfly PCB layout, top view — open source STM32 board by Broccoliux
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About the Dragonfly PCB

Dragonfly is an open source STM32 PCB design by Broccoliux, published on GitHub under the MIT license. It is a 4-layer board measuring 66 × 58.8 mm, with 226 components from 44 distinct parts.

Its main chip is the STM32F405RGTX, from the STM32 family. Other key parts include the ICM-20602, AT32F421G8U7, FD6288Q, TPS5430DDA and AMS1117-3.3. By type, the board carries 90 resistors, 71 capacitors, 24 transistors, 15 ICs, 15 diodes and 4 connectors.

It belongs with the robotics & motion, sensors and power & battery designs in this gallery.

From the project

A very cool, drone that can perform maneuvers.

A custom all-in-one flight controller + ESC, built entirely from discrete ICs rather than premade modules, designed for me by me. Flight control and all 4 motor drivers live on a single 4-layer PCB, designed from scratch in KiCad.

I wanted to go past just building a flight controller most DIY FC projects stop at a board that reads a gyro and outputs signals. I wanted the whole thing: FC and ESC combined on one board, IC-level design instead of stacking pre-built modules, a custom 3D-printed frame, and firmware configured to actually fly and hold up to real maneuvers, not just hover.

Main components on the Dragonfly

STM32F405RGTXICM-20602AT32F421G8U7FD6288QTPS5430DDAAMS1117-3.3L78L08_SO8AT7456EBMP280

Dragonfly bill of materials (BOM)

226 components, 44 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F405RGTX
STM32F405RGTx
U1
1
ICM-20602
U2
4
AT32F421G8U7
U3, U5, U7, U9
4
FD6288Q
U4, U6, U8, U10
1
TPS5430DDA
U11
1
AMS1117-3.3
U12
1
L78L08_SO8
U13
1
AT7456E
U14
1
BMP280
U15
24
Q_NMOS_GDS
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +16
1
TSX-3225
X1
1
27MHZ
Y1
1
CONN_01X04_PIN
Conn_01x04_Pin
J1
1
XT60PW-M
J7
1
CAM VIN
J8
1
VOUT
J9
1
32.768 kHz
+10ppm1
2
SW_SPST
SW1, SW2
1
LED BLUE
D1
1
LED RED
D2
Show 24 more
QtyPartRefs
12
1N914WT
D3, D4, D5, D6, D7, D8, D9, D10 +4
1
40V, 3A Schottky
D15
1
1KΩ 100Mhz
L1
1
15UH
15uh
L2
2
10PF
10pf
C1, C2
2
12PF
12pf
C3, C4
30
100NF
100nf
C5, C6, C9, C10, C11, C12, C17, C19 +22
3
2.2UF
2.2uf
C7, C8, C18
1
10NF
10nf
C13
4
1UF
1uf
C14, C61, C63, C72
24
10UF
10uf
C20, C24, C25, C27, C28, C29, C30, C31 +16
1
0.01UF
0.01uf
C58
1
220UF
220uf
C59
2
47UF
47uf
C70, C71
1
0.1UF
0.1uf
C73
1
10k NC
R1
35
10K
10k
R2, R3, R7, R8, R9, R10, R11, R15 +27
2
5.1kΩ
R4, R5
12
1k
R12, R13, R14, R30, R31, R32, R50, R51 +4
12
0R
R18, R22, R26, R42, R44, R46, R62, R64 +4
24
20R
R19, R20, R21, R23, R24, R25, R38, R39 +16
1
30.9K
30.9k
R87
1
100K
100k
R89
2
75R
R90, R91

Dragonfly design files

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

Dragonfly: common questions

What microcontroller does the Dragonfly use?

The Dragonfly is built around the STM32F405RGTX, from the STM32 family.

How big is the Dragonfly PCB?

The Dragonfly measures 66 × 58.8 mm, has 4 copper layers and is 2.2 mm thick.

How many components are on the Dragonfly?

226 components, from 44 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 Dragonfly design files?

From the Broccoliux/dragonfly 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 Dragonfly design in my own project?

Yes, under the terms of its MIT license, which Broccoliux chose for the repository.

Can I test firmware for the Dragonfly 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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