4 layers39 × 92 mm
Chaac ng
alvarop/chaac
This is a work in progress for a wireless weather station project.
82 parts21MIT
4 layers34 × 60 mm
Chaac
alvarop/chaac21This is a work in progress for a wireless weather station project.
- Size
- 34 × 60 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 70
- Nets
- 63
- Pads
- 294
- Tracks, vias
- 546, 97
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 27 Dec 2018
- Updated
- 24 Oct 2026
Overview
Chaac is an open-source printed circuit board by alvarop, from the alvarop/chaac repository on GitHub, published under the MIT licence. It is a 4-layer board of 34 × 60 mm with 70 parts on 63 nets, routed with 546 tracks and 97 vias.
It is built around the STM32L412KBT6, MCP73871EV and DPS368, with the RB521CS30L,315-JSM among its other parts. Its parts include 26 resistors, 23 capacitors, 6 ICs, 6 diodes and 4 connectors. It belongs with the STM32 boards of this library.
Main components
4
STM32L412KBT6
LQFP-32(7x7)-40℃~+85℃ 1.71V~3.6V 128KB 26 32 Bit 40KB 80MHz ARM Cortex-M4 Built-in FLASH LQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)MCP73871EV
-ModulesMicrochip TechnologyDPS368
VLGA-8(2x2.5)VLGA-8(2x2.5) Pressure Sensors ROHSInfineon TechnologiesPressure Sensors
RB521CS30L,315-JSM
DFN1006-2L1 Independent 200mA 30V 30uA@10V 350mV@10mA、380mV@20mA、400mV@20mA、600mV@200mA 500mA DFN1006-2L Schottky Diodes ROHSJSMSEMISchottky Diodes
README
README.mdParts
70| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 10k | Resistor_SMD:R_0402_1005Metric | R10, R11, R12, R13, R14, R15, R20, R21, R24, R25, R26 |
| 10 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C6, C7, C11, C12, C17, C20, C21, C22, C24, C25 |
| 5 | 1M | Resistor_SMD:R_0402_1005Metric | R3, R4, R6, R7, R9 |
| 5 | 1k | Resistor_SMD:R_0402_1005Metric | R17, R18, R19, R22, R23 |
| 5 | LED_ALT | LED_SMD:LED_0603_1608Metric | D2, D3, D4, D5, D6 |
| 3 | 0.01 uF | Capacitor_SMD:C_0402_1005Metric | C4, C18, C19 |
| 3 | 100k | Resistor_SMD:R_0402_1005Metric | R2, R5, R8 |
| 3 | 1uF | Capacitor_SMD:C_0402_1005Metric | C5, C9, C23 |
| 3 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C3, C8, C10 |
| 2 | 12pF | Capacitor_SMD:C_0402_1005Metric | C13, C15 |
| 2 | 47uF | Capacitor_SMD:C_1206_3216Metric | C1, C2 |
| 1 | 0 | Resistor_SMD:R_0402_1005Metric | R16 |
| 1 | 270k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 32.768kHz | alvarop:ABS05 | Y1 |
| 1 | Battery | alvarop:S2B-PH-SM4-TB | J2 |
| 1 | DPS368 | alvarop:DPS368 | U4 |
| 1 | E22-X00M22S | alvarop:E22-X00M22S | U6 |
| 1 | LOGO | alvarop:weather_station_tiny | G*** |
| 1 | LOGO | alvarop:weather_station | G*** |
| 1 | MCP73871 | alvarop:MCP73871 | U2 |
| 1 | Q_PMOS_GSD | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | RB521CS30L,315 | alvarop:RB521CS30L | D1 |
| 1 | SHT3x-DIS | alvarop:SHT3x | U5 |
| 1 | STM32L412K | alvarop:UFQFPN32-ALT | U3 |
| 1 | Solar | TerminalBlock_TE-Connectivity:TerminalBlock_TE_282834-2_1x02_P2.54mm_Horizontal | J1 |
| 1 | TC2030-CTX | alvarop:TC2030-NL | J3 |
| 1 | TPS7A0530PDBVT | alvarop:SOT-23(M5) | U1 |
| 1 | windrain | alvarop:043814-6621 | J5 |
The 69 most common of 70 parts.
More from alvarop/chaac
7- 4 layers41.8 × 14.8 mm
Nrf52811 usb
alvarop/chaac
This is a work in progress for a wireless weather station project.
46 parts21MIT - 2 layers31 × 19 mm
Nrf5281x usb lora
alvarop/chaac
This is a work in progress for a wireless weather station project.
35 parts21MIT - 4 layers26.8 × 14.8 mm
Rpi nrf52811
alvarop/chaac
This is a work in progress for a wireless weather station project.
29 parts21MIT - 4 layers40 × 20 mm
Chaac radio
alvarop/chaac
This is a work in progress for a wireless weather station project.
22 parts21MIT - 2 layers25.4 × 22.9 mm
- 4 layers34 × 13 mm
Antenna test
alvarop/chaac
This is a work in progress for a wireless weather station project.
5 parts21MIT
Similar boards
- 6 layers92 × 92 mm
- 2 layers56.5 × 66.8 mm
- 2 layers87 × 30.8 mm
- 2 layers24 × 24 mm
SX1280 module
dabit20/ExpressLRS-SX1280-module
SX1280 based 2.4GHz module for the ExpressLRS radio system
50 parts - 2 layers85 × 48 mm
- 2 layers57 × 57 mm
Sensor node
henriheimann/prosper3-monitor
Repository of the Prosper III Environment Monitor project ☀️🌱
52 parts - 4 layers102 × 52 mm
- 2 layers65 × 56 mm
Stm32BoB
Arlausea/2324_Projet2A_Eve
Upgrade of a robot arm to help disabled people in everyday life
33 parts
Questions
How big is the Chaac PCB?
It measures 34 × 60 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Chaac use?
70 parts, built around the STM32L412KBT6, MCP73871EV, DPS368 and RB521CS30L,315-JSM. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Chaac KiCad files?
From the alvarop/chaac repository on GitHub, at the commit this page was made from: the board is hw/chaac/chaac.kicad_pcb and its schematic hw/chaac_ng/chaac_ng.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Chaac design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).