2 layers60.5 × 51.5 mm
4 layers26 × 26 mm
MicroBaro Core
LibreCB/MicroBaro-CoreTiny 26x26mm IMU and Barometer logging device.
- Size
- 26 × 26 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 31
- Nets
- 47
- Pads
- 164
- Tracks, vias
- 320, 63
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 27 Mar 2025
- Updated
- 14 Apr 2025
Overview
MicroBaro Core is an open-source printed circuit board by LibreCB, from the LibreCB/MicroBaro-Core repository on GitHub. It is a 4-layer board of 26 × 26 mm with 31 parts on 47 nets, routed with 320 tracks and 63 vias.
It is built around the ATSAMD21E16B-MU, BMP390 and MSD-4-A, with the BMI270, TLV73333PDBVR-HXY and SR0603JR-7T5K1L among its other parts. Its parts include 6 capacitors, 5 ICs, 4 resistors, 4 connectors and 2 diodes. It belongs with the sensors and measurement boards and the SAM D and SAM boards of this library.
Main components
11
ATSAMD21E16B-MU
QFN-32-EP(5x5)-40℃~+85℃ 1.62V~3.6V 10bit 12bit 26 32 Bit 48MHz 64KB 8KB ARM Cortex-M0+ Built-in FLASH QFN-32-EP(5x5) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
BMP390
LGA-10(2x2)-40℃~+85℃ 0.6pa/K 1.5uA 1.65V~3.6V 30Kpa~1.25bar 3pa 50pa I2C、SPI Integrated ADC and digital interface、Standby mode、On-chip temperature output Yes LGA-10(2x2) Pressure Sensors ROHSBosch SensortecPressure Sensors
MSD-4-A
SMDSMD SD Card / Memory Card Connector ROHSCUISD Card / Memory Card Connector
BMI270
LGA-14(2.5x3)-40℃~+85℃ 1.71V~3.6V 16bit 2KB 3.5uA Accelerometer Gyroscope SPI、I2C X,Y,Z X,Y,Z ±16g ±2000dps LGA-14(2.5x3) Accelerometers ROHSBosch SensortecAccelerometers
TLV73333PDBVR-HXY
SOT-23-5L-40℃~+85℃ 10uA 110mV@(100mA) 3.3V 300mA 6.5V 75dB@(100Hz) Enable Fixed SOT-23-5L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHXY MOSFETVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SR0603JR-7T5K1L
0603-55℃~+155℃ 250mW 5.1kΩ Thick Film Resistor ±100ppm/℃ ±5% 0603 Chip Resistor - Surface Mount ROHSYAGEOChip Resistor - Surface Mount
403I35D12M00000
SMD3225-4P-40℃~+85℃ 100Ω 12MHz 18pF ±30ppm ±50ppm SMD3225-4P Crystals ROHSCTS Electronic ComponentsCrystals
B2B-PH-K-S
插件,P=2mmUncategorisedJST
LTST-C190KGKT
0603-30℃~+85℃ 130° 20mA 2V 35mcd 567.5nm~576.5nm 574nm 75mW Discrete Diode Water Clear Yellow Green 0603 LED Indication - Discrete ROHSLite-OnLED Indication - DiscreteLTST-C191KRKT
0603-55℃~+85℃ 130° 20mA 2V 54mcd 631nm 639nm 75mW Discrete Diode Red Water Clear 0603 LED Indication - Discrete ROHSLite-OnLED Indication - Discrete
USB4105-GF-A
SMD-40℃~+85℃ 1 12P 48V 5A Black Female Surface Mount, Right Angle Type-C USB 2.0 SMD USB Connectors ROHSGlobal Connector Technology (GCT)USB Connectors
README
README.md
µBaro Core
A small and cheap device able to log data from the integrated BMI160 6-DOF IMU and BMP390 barometer to an SD card. It also includes two GPIOs that can be used to record additional data, or trigger actions.
Parts
31| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C4, C5, C6 |
| 2 | 22pF | Capacitor_SMD:C_0603_1608Metric | C2, C3 |
| 2 | 5.1K | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | 55R | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D2.0mm | TP1, TP2 |
| 1 | 12MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | ATSAMD21E16B-MU | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.6x3.6mm | U1 |
| 1 | BMI160 | Package_LGA:Bosch_LGA-14_3x2.5mm_P0.5mm | U3 |
| 1 | BMP390 | Project:Bosch_WFLGA-10_2x2mm_P0.5mm | U2 |
| 1 | Conn_01x02 | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J4 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J3 |
| 1 | G*** | kibuzzard-67E48EA0 | kibuzzard-67E48EA0 |
| 1 | GREEN | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | LOGO | LOGO | G*** |
| 1 | Micro_SD_Card | Project:TF-SMD_TF-015 | J2 |
| 1 | RED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | TPS3831 | Package_SON:Texas_X2SON-4_1x1mm_P0.65mm | U6 |
| 1 | TPTLV73333PDBVR | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
Questions
How big is the MicroBaro Core PCB?
It measures 26 × 26 mm and has 4 copper layers, 1.61 mm thick.
What parts does the MicroBaro Core use?
31 parts, built around the ATSAMD21E16B-MU, BMP390, MSD-4-A and BMI270. 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 MicroBaro Core KiCad files?
From the LibreCB/MicroBaro-Core repository on GitHub, at the commit this page was made from: the board is MicroBaro-Core.kicad_pcb and its schematic MicroBaro-Core.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MicroBaro Core design in my own project?
Its repository states no licence, so its author keeps all rights: ask LibreCB before reusing the design.
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