HardLabs

Hummingbird

knosmos·hummingbird·hummingbird/hummingbird.kicad_pcb

Hummingbird PCB layout, top view — open source STM32 board by knosmos

About the Hummingbird PCB

Hummingbird is an open source STM32 PCB design by knosmos, published on GitHub. It is a 4-layer board measuring 53 × 20 mm, with 43 components from 27 distinct parts.

Its main chip is the STM32F103C8TX, from the STM32 family. Other key parts include the AMS1117-3.3, ICM-42688-P, AMS1117-5 and C138665. By type, the board carries 18 capacitors, 9 connectors, 6 resistors, 5 ICs, 2 transistors and 1 crystal.

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

From the project

custom stm32 flight controller for MIT Design Build Fly

Custom STM32 flight controller for MIT Design Build Fly 2025

- STM32F103C8T6 microprocessor - Altimeter and IMU - 2x Servo PWM - 12V / 5V LDO regulators - MOSFET LED drive circuits - Hall effect sensor input - GPS and magnetometer input

Hummingbird, from the project README
From the project README

Main components on the Hummingbird

STM32F103C8TXAMS1117-3.3ICM-42688-PAMS1117-5C138665

Hummingbird bill of materials (BOM)

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

QtyPartRefs
1
STM32F103C8TX
STM32F103C8Tx
U1
1
AMS1117-3.3
U2
1
ICM-42688-P
U3
1
AMS1117-5
U4
1
C138665
~
U5
2
AO3400A
Q1, Q2
1
16MHZ
16mhz
Y1
1
USB_C_RECEPTACLE_USB2.0_16P
USB_C_Receptacle_USB2.0_16P
J1
1
SRV1
srv1
J2
1
SRV2
srv2
J3
1
halleffect
J4
1
CONN_01X06
Conn_01x06
J5
2
CONN_01X02
Conn_01x02
J6, J7
1
PWR_IN
J8
1
CONN_02X02_COUNTER_CLOCKWISE
Conn_02x02_Counter_Clockwise
J9
1
LED
D1
1
100
FB1
7
100N
100n
C1, C4, C5, C6, C7, C11, C12
2
15P
15p
C2, C3
2
22U
22u
C8, C13
Show 7 more
QtyPartRefs
2
22U
22u
C9, C14
1
2U2
2u2
C10
1
4U7
4u7
C15
1
10N
10n
C17
2
1u
C18, C19
3
10K
10k
R1, R4, R5
3
5K1
5k1
R2, R3, R6

Hummingbird design files

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

Hummingbird: common questions

What microcontroller does the Hummingbird use?

The Hummingbird is built around the STM32F103C8TX, from the STM32 family.

How big is the Hummingbird PCB?

The Hummingbird measures 53 × 20 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Hummingbird?

43 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 Hummingbird design files?

From the knosmos/hummingbird 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 Hummingbird design in my own project?

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

Can I test firmware for the Hummingbird 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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