BMS for 4S LiFePO4 battery packs running on the STM32L152RE. Features a custom FreeModbus port and a Dockerized Python telemetry stack.

• 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.

• 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.
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