4 layers80 × 80 mm
Driver Board
famesy/CuteSat
This is an open-source CubeSat printed circuit board (PCB) project that includes both hardware and software components.
145 parts3
2 layers70 × 83.5 mm
BMS for 4S LiFePO4 battery packs running on the STM32L152RE. Features a custom FreeModbus port and a Dockerized Python telemetry stack.
- Size
- 70 × 83.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 45
- Nets
- 93
- Pads
- 203
- Tracks, vias
- 278, 35
- Pours
- 50
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Dec 2025
- Updated
- 15 Dec 2025
Overview
BMS is an open-source printed circuit board by LauriAlanen, from the LauriAlanen/BMS repository on GitHub. It is a 2-layer board of 70 × 83.5 mm with 45 parts on 93 nets, routed with 278 tracks and 35 vias.
It is built around the INA2181A2QDGSRQ1, MCP6002T-I/MS-HX and CD4052BNSR, with the LMV331ILT, IPD031N06L3GATMA1 and CSNL2512FT3L00 among its other parts. Its parts include 18 resistors, 8 capacitors, 6 ICs and 3 connectors. It belongs with the power boards and the FPGA and CPLD boards of this library.
Main components
7INA2181A2QDGSRQ1
VSSOP-10-200mV~26V -40℃~+125℃ 100dB 1uV/℃ 2 2.7V~5.5V 210kHz 2V/us 356uA 40nV/√Hz@1kHz 500uV 50V/V 75uA 8mA High-side detection、Low-side detection、Bidirectional detection、Programmable output reference level、Analog output interface ±28V VSSOP-10 Current Sense Amplifiers ROHSTexas InstrumentsCurrent Sense Amplifiers
MCP6002T-I/MS-HX
MSOP-8MSOP-8 Operational Amplifier ROHSZHHXDZOperational Amplifier
CD4052BNSR
SO-16-208mil-55℃~+125℃ 125Ω 160ns 25MHz 3V~20V 4:1 720ns 720ns 8 SO-16-208mil Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
LMV331ILT
SOT-23-5-40℃~+85℃ 1 1mV 1nA 2.7V~5V 200ns 20uA 25nA 5.5V 5uV/℃ Open-drain SOT-23-5 Comparators ROHSSTMicroelectronicsComparatorsIPD031N06L3GATMA1
TO-252-55℃~+175℃ 1 N-channel 100A 13nF 167W 2.2V 3.1mΩ@10V 60V 79nC@4.5V TO-252 MOSFETs ROHSInfineon TechnologiesMOSFETs
CSNL2512FT3L00
25122W 3mΩ Current Sense Resistor ±1% ±50ppm/℃ 2512 Current Sense Resistors / Shunt Resistors ROHSStackpole Electronics (SEI)Current Sense Resistors / Shunt ResistorsTB001-500-10BE
插件,P=5mmScrew Terminal BlocksCUI
README
README.mdBMS for 4S LiFePO4 battery packs running on the STM32L152RE. Features a custom FreeModbus port and a Dockerized Python telemetry stack.
Firmware Architecture Highlights
- MCU: STM32L152RE using LL (Low Layer) drivers.
- Control Loops:
- Fast Loop: Current sensing and Coulomb Counting.
- Slow Loop (500ms): Voltage/Temp monitoring and slower safety checks.
- SoC Algorithm: Coulomb counting with OCV (Open Circuit Voltage) recalibration during rest.
- Protection: Over/Under Voltage, Over/Under Temp, Overcurrent sensing with analog WDT (includes cooldown retry logic).
- Handle-Based: Encapsulates all state variables in BMS_handle_t, enabling modular, instance-specific logic.
- Data Decoupling: Uses separate packed structs for Modbus communication (BMS_input_t/BMS_output_t), isolating internal state from the external protocol layer.
- Runtime Configurability: Utilizes a nested BMS_config_t struct to allow hot-swapping of safety limits and parameters via Modbus without recompilation.
Telemetry Stack + Master
- A USB-RS485 connection feeds data to a containerized dashboard.
- Master supports multiple BMS nodes.
- Ported freemodbus library to STM32L152RE
- Dashboard: Python Streamlit app for control and live metrics.
- Storage: InfluxDB for time-series data.
- Visualization: Grafana for analytics.
-
Parts
45| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | ERA-3AEB103V | SamacSys_Parts:ERA3AEB101V | R3, R4, R6, R7, R8, R10, R11, R12, R13, R14, R17, R18 |
| 6 | C0603C104K4RACTU | 3rdparty:C0603 | C1, C2, C3, C4, C5, C8 |
| 4 | Conn_01x01_Pin | Connector_Wire:SolderWirePad_1x01_SMD_4x8mm | -B1, -P1, +B1, +P1 |
| 4 | IPD031N06L3GATMA1 | 3rdparty:IPD031N06L3GATMA1 | CFET1, CFET2, DFET1, DFET2 |
| 2 | 929975-01-19-RK | 3rdparty:9299750119RK | J4, J5 |
| 2 | C0603C103K1RACTU | 3rdparty:C0603 | C6, C7 |
| 2 | ERA-3AEB8661V | SamacSys_Parts:ERA3AEB101V | R1, R2 |
| 2 | ERA-3AEB9090V | SamacSys_Parts:ERA3AEB101V | R19, R20 |
| 2 | LOGO | LOGO | G***, G*** |
| 1 | CD4052BNSR | 3rdparty:SOIC127P780X200-16N | IC1 |
| 1 | CSNL2512FT3L00 | 3rdparty:CSNL2512FT3L00 | R5 |
| 1 | ERA-3AEB102V | SamacSys_Parts:ERA3AEB101V | R9 |
| 1 | INA2181A2QDGSRQ1 | 3rdparty:SOP50P490X110-10N | IC5 |
| 1 | LMV331ILT | 3rdparty:SOT95P280X145-5N | IC4 |
| 1 | MCP6002T-I_MS | 3rdparty:SOP65P490X110-8N | IC3 |
| 1 | OPA333AIDCKR | 3rdparty:SOT65P210X110-5N | IC2 |
| 1 | TB001-500-10BE | SamacSys_Parts:SHDR10W100P0X500_1X10_5000X900X1250P | J3 |
| 1 | XC7SH08GW,125 | SamacSys_Parts:SOT65P212X110-5N | IC7 |
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Questions
How big is the BMS PCB?
It measures 70 × 83.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BMS use?
45 parts, built around the INA2181A2QDGSRQ1, MCP6002T-I/MS-HX, CD4052BNSR and LMV331ILT. 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 BMS KiCad files?
From the LauriAlanen/BMS repository on GitHub, at the commit this page was made from: the board is Hardware/Schematics/KiCad/BMS.kicad_pcb and its schematic Hardware/Schematics/KiCad/BMS.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the BMS design in my own project?
Its repository states no licence, so its author keeps all rights: ask LauriAlanen before reusing the design.