HardLabs

Chaac ng

alvarop·chaac·hw/chaac_ng/chaac_ng.kicad_pcb

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

About the Chaac ng PCB

Chaac ng is an open source STM32 PCB design by alvarop, published on GitHub under the MIT license. It is a 4-layer board measuring 39 × 92 mm, with 73 components from 36 distinct parts.

Its main chip is the STM32L412KBT6, from the STM32 family. Other key parts include the E22-900M22S, BQ24074RGTR, TCR3DF33,LM(CT, MAX3221EIPWR and TPS61252DSGR. By type, the board carries 28 resistors, 23 capacitors, 6 ICs, 6 connectors, 6 diodes and 2 switches.

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 ng

E22-900M22SBQ24074RGTRTCR3DF33,LM(CTMAX3221EIPWRSTM32L412KBT6TPS61252DSGR

Chaac ng bill of materials (BOM)

73 components, 36 distinct parts.

QtyPartRefs
1
E22-900M22S
E22-X00M22S
U1
1
BQ24074RGTR
BQ24074RGT
U2
1
TCR3DF33,LM(CT
TPS76333
U3
1
MAX3221EIPWR
MAX3221
U4
1
STM32L412KBT6
STM32L412KBTx
U5
1
TPS61252DSGR
TPS61252DSG
U6
1
ABS05-32.768KHZ-9-T
32.768kHz
Y1
1
S2B-PH-SM4-TB(LF)(SN)
Battery
J1
1
282834-2
Solar
J2
1
TC2030-CTX
J3
1
282834-4
DATA
J4
1
TYPE-C16PIN
USB_C_Receptacle_USB2.0_16P
J5
1
282834-2
6V_PWR
J6
2
SKRKAEE020
SW_Push
SW1, SW2
2
SK520CHV6G
SK520CH
D1, D2
4
KT-0603R
LED
D3, D4, D5, D6
1
DFE201610E-1R0M=P2
1uH
L1
12
CL05B104KB54PNC
0.1uF
C1, C2, C4, C5, C6, C7, C12, C13 +4
3
CL05A105KA5NQNC
1uF
C3, C9, C15
2
CL05A475MP5NRNC
4.7uF
C8, C19
Show 16 more
QtyPartRefs
2
0402CG120J500NT
12pf
C10, C11
1
CL10A106MA8NRNC
10uF
C16
1
CL05B103KB5NNNC
0.01uF
C18
1
0402CG101J500NT
100pF
C21
1
TMK325B7226KMHP
22uF
C23
4
1M
R1, R2, R3, R4
2
5.1k
R5, R6
8
10k
R7, R12, R13, R16, R17, R20, R25, R27
7
0
R8, R10, R11, R14, R15, R19, R21
1
1k
R9
1
1.5k
R18
1
6.65k
R22
1
750k
R23
1
180k
R24
1
866k
R26
1
43k
R28

Chaac ng 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 ng: common questions

What microcontroller does the Chaac ng use?

The Chaac ng is built around the STM32L412KBT6, from the STM32 family.

How big is the Chaac ng PCB?

The Chaac ng measures 39 × 92 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Chaac ng?

73 components, from 36 distinct parts. The full bill of materials is listed on this page.

Where can I download the Chaac ng design files?

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

Can I use the Chaac ng 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 ng 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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