4 layers34 × 60 mm
4 layers39 × 92 mm
Chaac ng
alvarop/chaac21This is a work in progress for a wireless weather station project.
- Size
- 39 × 92 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 82
- Nets
- 75
- Pads
- 278
- Tracks, vias
- 607, 104
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 27 Dec 2018
- Updated
- 24 Oct 2026
Overview
Chaac ng 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 39 × 92 mm with 82 parts on 75 nets, routed with 607 tracks and 104 vias.
It is built around the STM32L412KBT6, E22-900M22S and MAX3221CPW, with the TPS61252DSG, BQ24074RGTR and TCR3DF33,LM(CT among its other parts. Its parts include 28 resistors, 23 capacitors, 6 ICs, 6 diodes and 6 connectors. It belongs with the STM32 boards of this library.
Main components
12
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)
E22-900M22S
SMD,20x14mm-147dBm 119mA 2.5V~3.7V 22.3dBm 6.8mA 7km Continuous frequency coverage FSK、LoRa SPI Stamp Hole Antenna、IPEX interface SMD,20x14mm LoRa Modules ROHSChengdu Ebyte Elec TechLoRa Modules
MAX3221CPW
TSSOP-160℃~+70℃ 1 1 1uA 250Kbps 3V~5.5V Transceiver Yes ±15kV TSSOP-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs
TPS61252DSG
WSON-8-EP(2x2)-40℃~+85℃@(TA)、-40℃~+125℃@(TJ) 1 1.5A 2.3V~6.5V 2.3V~6V 3.25MHz 30uA Adjustable Boost Boost Built-in No WSON-8-EP(2x2) DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
BQ24074RGTR
QFN-16-EP(3x3)-40℃~+125℃ 1 1.5A 4.2V 4.35V~10.2V 6.5uA Charging IC Lithium Battery Not supported Support QFN-16-EP(3x3) Battery Management ROHSTexas InstrumentsBattery Management
TCR3DF33,LM(CT
SOT-25-5-40℃~+85℃@(Ta) 1 250mV@(300mA) 3.3V 300mA 5.5V 65uA 70dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection Positive SOT-25-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSToshibaVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
CL05B104KB54PNC
0402100nF 50V X7R ±10% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
KT-0603R
0603-40℃~+85℃ 1.6mm x 0.8mm square LED 1.8V~2.4V 120° 20mA 300mcd 40mW 615nm~630nm 645nm Discrete Diode Red Water Clear 0603 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete0402CG120J500NT
040212pF 50V C0G ±5% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSGuangdong Fenghua Advanced Tech (FH)Multilayer Ceramic Capacitors MLCC - SMD/SMT
SK520CHV6G
SMC-55℃~+150℃ 1 Independent 120A 200V 300uA@200V 5A 950mV@5A SMC Schottky Diodes ROHSTaiwan SemiconductorSchottky Diodes
SKRKAEE020
SMD,3.9x2.9mm-40℃~+85℃ 1.6N 12V 2.9mm 200,000 Cycles 2mm 3.9mm 50mA Round Button SMD(SMT) Tab SPST-NO Surface Mount,Vertical SMD,3.9x2.9mm Tactile Switches ROHSALPSALPINETactile Switches0402CG101J500NT
0402100pF 50V C0G ±5% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSGuangdong Fenghua Advanced Tech (FH)Multilayer Ceramic Capacitors MLCC - SMD/SMT
README
README.mdParts
82| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C4, C5, C6, C7, C12, C13, C14, C17, C20, C22 |
| 8 | 10k | Resistor_SMD:R_0402_1005Metric | R7, R12, R13, R16, R17, R20, R25, R27 |
| 7 | 0 | Resistor_SMD:R_0402_1005Metric | R8, R10, R11, R14, R15, R19, R21 |
| 4 | 1M | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4 |
| 4 | LED | LED_SMD:LED_0603_1608Metric | D3, D4, D5, D6 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | 1uF | Capacitor_SMD:C_0402_1005Metric | C3, C9, C15 |
| 2 | 12pf | Capacitor_SMD:C_0402_1005Metric | C10, C11 |
| 2 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C8, C19 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R5, R6 |
| 2 | MountingHole | alvarop:ZIPTIE_HOLE_4x2mm | H5, H6 |
| 2 | SK520CH | alvarop:SK520_DO-214AB | D1, D2 |
| 2 | SW_Push | easyeda:SW-SMD_L3.9-W3.0-P4.45 | SW1, SW2 |
| 1 | 0.01uF | Capacitor_SMD:C_0402_1005Metric | C18 |
| 1 | 1.5k | Resistor_SMD:R_0402_1005Metric | R18 |
| 1 | 100pF | Capacitor_SMD:C_0402_1005Metric | C21 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C16 |
| 1 | 180k | Resistor_SMD:R_0402_1005Metric | R24 |
| 1 | 1k | Resistor_SMD:R_0402_1005Metric | R9 |
| 1 | 1uH | alvarop:L_0806 | L1 |
| 1 | 22uF | Capacitor_SMD:C_1210_3225Metric | C23 |
| 1 | 32.768kHz | alvarop:ABS05 | Y1 |
| 1 | 43k | Resistor_SMD:R_0402_1005Metric | R28 |
| 1 | 6.65k | Resistor_SMD:R_0402_1005Metric | R22 |
| 1 | 6V_PWR | alvarop:TerminalBlock_TE_282834-2_1x02_P2.54mm_Horizontal | J6 |
| 1 | 750k | Resistor_SMD:R_0402_1005Metric | R23 |
| 1 | 866k | Resistor_SMD:R_0402_1005Metric | R26 |
| 1 | BQ24074RGT | Package_DFN_QFN:VQFN-16-1EP_3x3mm_P0.5mm_EP1.6x1.6mm | U2 |
| 1 | Battery | alvarop:S2B-PH-SM4-TB | J1 |
| 1 | DATA | alvarop:TerminalBlock_TE_282834-4_1x04_P2.54mm_Horizontal | J4 |
| 1 | E22-X00M22S | alvarop:E22-X00M22S | U1 |
| 1 | LOGO | alvarop:weather_station_tiny | G*** |
| 1 | LOGO | alvarop:weather_station | G*** |
| 1 | MAX3221 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U4 |
| 1 | STM32L412KBTx | Package_QFP:LQFP-32_7x7mm_P0.8mm | U5 |
| 1 | Solar | alvarop:TerminalBlock_TE_282834-2_1x02_P2.54mm_Horizontal | J2 |
| 1 | TC2030-CTX | alvarop:TC2030-NL | J3 |
| 1 | TPS61252DSG | Package_SON:WSON-8-1EP_2x2mm_P0.5mm_EP0.9x1.6mm | U6 |
| 1 | TPS76333 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | USB_C_Receptacle_USB2.0_16P | easyeda:USB-C-SMD_TYPE-C16PIN | J5 |
The 81 most common of 82 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
- 4 layers45 × 34 mm
Triangle flywheel balancer
RobbyV2/smart_latch_lock
A self-closing bike lock built as a clamshell ring. A fixed arc bolts to the housing, a hinged arc swings 180 degrees to meet it, and a worm gearmotor closes the loop around the frame and rim on a button press or a BLE…
70 parts - 2 layers157 × 58 mm
- 2 layers
Mouse
nathan-cannell/robotic_mice_dxarts
This repository documents the Robotic Mice project, an interactive art installation for the University of Washington's DXARTS program.
33 parts1 - 4 layers184.3 × 131 mm
- 6 layers95 × 55 mm
- 4 layers28.7 × 27 mm
Neurband c
jlcjak/neurband
Open, minimal sEMG wristband like the Meta Neural Band: 8-ch ADS1298 + nRF52832 BLE, dry gold electrodes on a flex, 3D-printed band. KiCad, FreeCAD, Zephyr, Python, simulations.
70 parts46 - 4 layers46 × 46 mm
Placement
anil08607/stm32-smartwatch
A 46 × 46 mm, four-layer Bluetooth smartwatch PCB with a Nordic nRF52810-QFAA, 240 × 240 SPI LCD interface, BMA456 accelerometer, battery-backed PCF8563 RTC, USB-C 5 V charging, protected single-cell battery interface…
71 parts - 2 layers85.8 × 53.4 mm
Questions
How big is the Chaac ng PCB?
It measures 39 × 92 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Chaac ng use?
82 parts, built around the STM32L412KBT6, E22-900M22S, MAX3221CPW and TPS61252DSG. 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 ng KiCad files?
From the alvarop/chaac repository on GitHub, at the commit this page was made from: the board is hw/chaac_ng/chaac_ng.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 ng 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).