2 layers29 × 41.1 mm
4 layers96 × 60 mm
Sensor Node
souptik-samanta/Sensor-Node1A compact environmental monitoring node built around the STM32L052 microcontroller. The board measures temperature, humidity, while providing onboard storage and support for external SX1262 LoRa modules.
- Size
- 96 × 60 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 59
- Nets
- 65
- Pads
- 221
- Tracks, vias
- 384, 75
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 27 Jun 2026
- Updated
- 17 Oct 2026
Overview
Sensor Node is an open-source printed circuit board by souptik-samanta, from the souptik-samanta/Sensor-Node repository on GitHub. It is a 4-layer board of 96 × 60 mm with 59 parts on 65 nets, routed with 384 tracks and 75 vias.
It is built around the LPS25HB, W25Q32JVSSIQ and AP2112K-3.3, with the BQ25176JDSG and USBLC6-2P6 among its other parts. Its parts include 16 capacitors, 16 resistors, 7 ICs, 5 connectors and 2 diodes. It belongs with the home automation and IoT and sensors and measurement boards and the STM32 boards of this library.
Main components
5
LPS25HB
HLGA-10(2.5x2.5)-30℃~+105℃ 0.1hpa 0.2hpa 1.7V~3.6V 26Kpa~1.26bar I2C、SPI No HLGA-10(2.5x2.5) Pressure Sensors ROHSSTMicroelectronicsPressure Sensors
W25Q32JVSSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 133MHz 1uA 2.7V~3.6V 20 Years 32Mbit 3ms SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorised
BQ25176JDSG
WSON-8-EP(2x2)-40℃~+125℃ 1 3V~25V 800mA WSON-8-EP(2x2) Battery Management ROHSTexas InstrumentsBattery Management
USBLC6-2P6
SOT-666-6-40℃~+125℃ 150nA 17V 2 3.5pF 5.25V 5A@8/20us 6V ESD IEC 61000-4-2 Unidirectional SOT-666-6 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
README
README.mdSensor Node
A compact environmental monitoring node built around the STM32L052 microcontroller. The board measures temperature, humidity, while providing onboard storage and support for external SX1262 LoRa modules.
Why I Made It
I wanted to design a low-power sensor platform that could be deployed outdoors for long periods while collecting environmental data. Instead of using multiple development boards, I designed a custom PCB that integrates sensing, power management, storage, and expansion capabilities into a single board.
Features
- STM32L052 ultra-low-power microcontroller
- SHT40 temperature and humidity sensor
- Onboard SPI flash storage
- USB-C power input
- Battery-powered operation
- External SX1262 LoRa module support
- SWD debugging interface
- Battery voltage monitoring
Hardware
3D Render
PCB Layout
Schematic
IRL
PCB Specifications
- 4 Layer PCB
- Designed in KiCad
- USB-C Connectivity
- Onboard Environmental Sensors
- Battery Monitoring Circuit
- SWD Programming Header
- SPI Flash Storage
- GPIO Expansion Headers
PCB Stackup
- Top Signal
- Ground Plane
- 3.3V Power Plane
- Bottom Signal
Power System
- USB-C Input
- Single Cell Li-Ion Battery Support
- Solar Charging Support
- Battery Voltage Monitoring
- Low-Power Design
Firmware
The firmware is responsible for:
- Reading sensor data
- Storing measurements in flash memory
- Monitoring battery voltage
- Managing low-power operation
- Communicating with external SX1262 modules
Component Count
- 71 Components
- 374 Pins
- "67 Nets"
- 4-Layer PCB
Bill of Materials (BOM)
| Designator | Quantity | Value / Part |
|---|---|---|
| BT1 | 1 | 18650 Battery Holder (Keystone 1042) |
| C1, C2, C12, C13 | 4 | 1µF Capacitor (0603) |
| C5, C6, C8, C10 | 4 | 4.7µF Capacitor (0603) |
| C3, C4, C7, C9, C11, C14, C15, C16 | 8 | 100nF Capacitor (0603) |
| D1, D2 | 2 | LED (0603) |
| J1 | 1 | USB-C Receptacle (USB4105-xx-A) |
| J2 | 1 | 1x4 Pin Header |
| J3, J4 | 2 | 1x8 Pin Header |
| J5 | 1 | Power Select Header |
| L1 | 1 | 3.3µH Inductor |
| R1, R2, R5, R6, R11, R12, R13, R14, R16 | 9 | 10kΩ Resistor (0603) |
| R10 | 1 | 100kΩ Resistor (0603) |
| R15 | 1 | LDR07 Light Dependent Resistor |
| R3, R4 | 2 | 5.1kΩ Resistor (0603) |
| R7 | 1 | 600Ω Resistor (0603) |
| R8 | 1 | 35.7kΩ Resistor (0603) |
| R9 | 1 | 33kΩ Resistor (0603) |
| SW1 | 1 | Push Button Switch (SKRK Series) |
| TH1 | 1 | NTC Thermistor |
| TP1, TP2, TP4, TP5, TP6 | 5 | Test Point |
| U1 | 1 | STM32L052C8Tx Microcontroller |
| U3 | 1 | USBLC6-2P6 USB ESD Protection |
| U4 | 1 | AP2112K-3.3 Voltage Regulator |
| U5 | 1 | BQ25176J Battery Charger |
| U6 | 1 | SHT4x Temperature & Humidity Sensor |
| U7 | 1 | LPS25HB Pressure Sensor |
| U8 | 1 | W25Q32JVSS SPI Flash Memory |
Manufacturing Cost
| Item | Cost |
|---|---|
| PCB + PCBA (JLCPCB) | $70 |
| Shipping | $24 |
| Total | $94 |
DEMO VIDEO
How to Use
Upload the Firmware
The firmware can be uploaded to the board through the SWD programming interface using an ST-LINK debugger.
- Install STM32CubeIDE.
- Connect the ST-LINK debugger to the board's SWD header:
SWDIOtoSWDIOSWCLKtoSWCLKGNDtoGND3V3to the target voltage/reference pin, if required by the debugger- Connect
NRSTas well when using reset-under-connect
- Connect the board to power. Do not connect multiple power sources unless they share a suitable common ground and are intended to be used together.
- In STM32CubeIDE, choose File > Import > Existing Projects into Workspace and select the
SensorNode Codefolder. - Select the
SensorNodeproject and click Build. The compiled firmware is generated atSensorNode Code/Debug/SensorNode.elf. - Right-click the project and choose Run As > STM32 Cortex-M C/C++ Application.
- Select the connected ST-LINK probe when prompted. STM32CubeIDE will erase the required flash sectors, program the firmware, and reset the microcontroller.
To upload a later firmware change, build the project again and repeat step 6. The project is configured for SWD programming of the STM32L051C8Tx; the USB-C connector should only be used for programming if a compatible USB bootloader has been added to the firmware.
Parts
59| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2, R5, R6, R11, R12, R13, R14, R16 |
| 8 | 100nF | Capacitor_SMD:C_0603_1608Metric | C3, C4, C7, C9, C11, C14, C15, C16 |
| 5 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2, TP4, TP5, TP6 |
| 4 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C12, C13 |
| 4 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C5, C6, C8, C10 |
| 4 | LOGO | LOGO | G***, G***, G***, G*** |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R3, R4 |
| 2 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J3, J4 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | D1, D2 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | 3.3uH | Inductor_SMD:L_0603_1608Metric | L1 |
| 1 | 33k | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | 35.7k | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 600 | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | BQ25176J | Package_SON:WSON-8-1EP_2x2mm_P0.5mm_EP0.9x1.6mm | U5 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_1042_1x18650 | BT1 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | LDR07 | OptoDevice:R_LDR_5.1x4.3mm_P3.4mm_Vertical | R15 |
| 1 | LPS25HB | Package_LGA:ST_HLGA-10_2.5x2.5mm_P0.6mm_LayoutBorder3x2y | U7 |
| 1 | Power select | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J5 |
| 1 | SHT4x | Sensor_Humidity:Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPad | U6 |
| 1 | STM32L052C8Tx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK | SW1 |
| 1 | Thermistor_NTC | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P1.90mm_Vertical | TH1 |
| 1 | USBLC6-2P6 | Package_TO_SOT_SMD:SOT-666 | U3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
| 1 | W25Q32JVSS | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U8 |
Questions
How big is the Sensor Node PCB?
It measures 96 × 60 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Sensor Node use?
59 parts, built around the LPS25HB, W25Q32JVSSIQ, AP2112K-3.3 and BQ25176JDSG. 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 Sensor Node KiCad files?
From the souptik-samanta/Sensor-Node repository on GitHub, at the commit this page was made from: the board is PCB/PCB.kicad_pcb and its schematic PCB/PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sensor Node design in my own project?
Its repository states no licence, so its author keeps all rights: ask souptik-samanta before reusing the design.
Similar boards
- 4 layers108.4 × 50 mm
No fly zone
tynix5/no_fly_zone
STM32-based quadcopter and remote controller running on custom hardware and software
90 parts1 - 4 layers83 × 106 mm
- 4 layers61 × 26 mm
- 2 layers25.7 × 67.6 mm
- 4 layers92.4 × 56.8 mm
STM32 IOT project
pdaslabs08/ESP32-and-IOT_Project1
Custom 4-layer ESP32 IoT PCB designed in KiCad with complete schematic, PCB layout, and manufacturing-ready files.
87 parts - 2 layers32.3 × 59.7 mm
- 4 layers40.1 × 82.8 mm
FlightPCB
Shubhamai/tsar
General-purpose & fully programmable flight computer PCB desgined in KiCad EDA
143 parts