HardLabs

Chaac

alvarop·chaac·hw/chaac/chaac.kicad_pcb

Chaac PCB layout, top view — open source STM32 board by alvarop

About the Chaac PCB

Chaac is an open source STM32 PCB design by alvarop, published on GitHub under the MIT license. It is a 4-layer board measuring 34 × 60 mm, with 67 components from 26 distinct parts.

Its main chip is the STM32L412K, from the STM32 family. Other key parts include the TPS7A0530PDBVT, MCP73871, DPS368, SHT3x-DIS and E22-X00M22S. By type, the board carries 26 resistors, 23 capacitors, 6 ICs, 6 diodes, 4 connectors and 1 transistor.

From the project

This is a work in progress for a wireless weather station project.

This is a work in progress for a wireless weather station project.

Hardware - Main development board design files Firmware - Code for the microcontroller * Software - Python scripts to communicate with the weather station, log, and plot data

Main components on the Chaac

TPS7A0530PDBVTMCP73871STM32L412KDPS368SHT3x-DISE22-X00M22S

Chaac bill of materials (BOM)

67 components, 26 distinct parts.

QtyPartRefs
1
TPS7A0530PDBVT
U1
1
MCP73871
U2
1
STM32L412K
U3
1
DPS368
U4
1
SHT3x-DIS
U5
1
E22-X00M22S
U6
1
Q_PMOS_GSD
Q1
1
32.768kHz
Y1
1
Solar
J1
1
Battery
J2
1
TC2030-CTX
J3
1
windrain
J5
1
RB521CS30L,315
D1
5
LED_ALT
D2, D3, D4, D5, D6
2
47uF
C1, C2
3
4.7uF
C3, C8, C10
3
0.01 uF
C4, C18, C19
3
1uF
C5, C9, C23
10
0.1uF
C6, C7, C11, C12, C17, C20, C21, C22 +2
2
12pF
C13, C15
Show 6 more
QtyPartRefs
1
270k
R1
3
100k
R2, R5, R8
5
1M
R3, R4, R6, R7, R9
11
10k
R10, R11, R12, R13, R14, R15, R20, R21 +3
1
0
R16
5
1k
R17, R18, R19, R22, R23

Chaac design files

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

Chaac: common questions

What microcontroller does the Chaac use?

The Chaac is built around the STM32L412K, from the STM32 family.

How big is the Chaac PCB?

The Chaac measures 34 × 60 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Chaac?

67 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the Chaac design files?

From the alvarop/chaac repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Chaac design in my own project?

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

Can I test firmware for the Chaac 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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