HardLabs

Aurora-Watch

CooperW824·Aurora-Watch·ProjectAurora/ProjectAurora.kicad_pcb

Aurora-Watch PCB layout, top view — open source STM32 board by CooperW824

About the Aurora-Watch PCB

Aurora-Watch is an open source STM32 PCB design by CooperW824, published on GitHub under the MIT license. It is a 4-layer board measuring 36 × 36 mm, with 79 components from 39 distinct parts.

Its main chip is the STM32U031K8Ux, from the STM32 family. Other key parts include the IS31FL3237-QFLS4-TR, LSM303AGRTR, BQ25185DLHR, MAX17048G+T10 and TPS63900DSKR. By type, the board carries 26 capacitors, 21 resistors, 14 diodes, 9 ICs, 2 switches and 2 test points.

It belongs with the wearables and power & battery designs in this gallery.

From the project

Project Aurora: Cooper's Custom Digital Analog Watch

It is a custom designed printed circuit board that contains a ring of 12 RGB LEDs, a microcontroller, and some senors to: 1. Display the current time. Where the red LED represents the hour hand, the green LED is the minute hand and the blue LED is the second hand. 2. Display the current ambient temperature using the number of LEDs lit and the color of the LEDs for the temperature. 3. A magnetic compass with the red LED pointing north, and the blue LED pointing south 4. A read out of the current battery charge using the LEDs 5. A built in step counter 5. A flashlight that uses the red LEDs to…

Main components on the Aurora-Watch

IS31FL3237-QFLS4-TRLSM303AGRTRBQ25185DLHRMAX17048G+T10TPS63900DSKRSTM32U031K8UxCP2102N-Axx-xQFN20TPD2EUSB30ATMP1075DSG

Aurora-Watch bill of materials (BOM)

79 components, 39 distinct parts.

QtyPartRefs
1
IS31FL3237-QFLS4-TR
IC1
1
LSM303AGRTR
IC2
1
BQ25185DLHR
IC3
1
MAX17048G+T10
IC4
1
TPS63900DSKR
IC5
1
STM32U031K8Ux
U1
1
CP2102N-Axx-xQFN20
U2
1
TPD2EUSB30A
U3
1
TMP1075DSG
U4
1
ABS07-32.768KHZ-T
Y1
1
USB_C_Receptacle_USB2.0_14P
J1
1
Battery_Cell
BT1
2
EVP-AA202K
S1, S2
1
10K @ 25C, B=3435K
TH1
2
TestPoint_2Pole
TP1, TP2
12
LED_RGBA
D1, D2, D3, D4, D5, D6, D7, D8 +4
2
LED
D13, D14
1
2.2uH
L1
2
18pF
C1, C2
9
0.1uF
C3, C4, C8, C10, C13, C15, C18, C23 +1
Show 19 more
QtyPartRefs
3
4.7uF
C5, C11, C12
2
0.01uF
C6, C16
4
1uF
C7, C14, C20, C21
1
4.7nF
C9
3
10uF
C17, C22, C24
1
220nF
C19
1
22uF
C25
8
10K
R1, R2, R5, R16, R17, R19, R20, R21
2
5.1K
R3, R4
1
22.1K
R6
1
47.5K
R7
1
1M
R8
2
220
R9, R10
1
3.3K
R11
1
100K
R12
1
5K
R13
1
18K
R14
1
2K
R15
1
36.5K
R18

Aurora-Watch design files

The KiCad project lives in the CooperW824/Aurora-Watch repository on GitHub; these links point at the commit this page was built from.

Aurora-Watch: common questions

What microcontroller does the Aurora-Watch use?

The Aurora-Watch is built around the STM32U031K8Ux, from the STM32 family.

How big is the Aurora-Watch PCB?

The Aurora-Watch measures 36 × 36 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Aurora-Watch?

79 components, from 39 distinct parts. The full bill of materials is listed on this page.

Where can I download the Aurora-Watch design files?

From the CooperW824/Aurora-Watch repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Aurora-Watch design in my own project?

Yes, under the terms of its MIT license, which CooperW824 chose for the repository.

Can I test firmware for the Aurora-Watch 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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