2024-2026 Electromechanical Electrical PDR Notes

SOM (System on a module)

• Package = SOM (MCU, CAN, POWER) + Daughter Board (System Specific Circuitry)

  • Controls

  • BPS

  • Data aq

• Leader SOM

  • same for all systems

  • sits on top of the daughter board (like a hat)

  • Power Connector → Voltage Regulation (12v → 5v)

  • STM32F4 (MCU) → Car CAN, 7-seg disp, Micro USB, SD Card, Daughter Board (customized to each system)

Controls

• Leader-Daughter Package (Controls specific/system specific)

• 4x Peripheral

  • Front Blind spot x2

  • Rear Blind spot + lights x2

• CAN

  • Controls CAN

    • 4x peripheral board

• 7 in display - comms thru RPi (UART from controls, HDMI to display)

• speaker/buzzer implementation

• only 1 motor design

• cruise control - up and down buttons to control speed

• driver fans

  • analog potentiometer to controls → fan to control speed

• steering wheel buttons

• blind spot detection

  • 2 on each side

    • 1 angled back positioned at the front

    • 1 perpendicular in the rear

• Motor controller requires 12V CAN, peripheral boards require 5V, weird cabling, but theoretically more robust

BPS

• Leader

• 2x Peripheral SOM

  • VoltTemp

  • Amperes

• Car CAN (all electric systems)

• BPS CAN (in lieu of IsoSPI)

  • volt, temp, current, other battery data

• support for 2, 3, and 4 pin fans via I2C

• support for up to 3 contactors + individual sense pins

• BPS Leader design

  • Leader SOM

    • Fan (via I2C)

    • 3x Contactor Drivers

    • Strobe Lights

• Peripheral SOM

  • CAN → STM32L4 (requires 5v to 3.3v) → micro usb, back to daughter board

• VoltTemp Boards

  • voltage

    • 16 Battery Cells per stack

    • support for I2C instead of IsoSPI

    • Battery → peripheral board → peripheral SOM mcu

  • temp

    • 16 channel mux/adc

• Amperes Board

  • monitor Shunt Temp

  • CAN via peripheral

  • more accurate state of charge

• support for Orion BMS Still there (backwards compatible)

• connecting Fan connector to Orion to still run fans

Power Systems

• PCB Design for VoltTemp

  • Each thermistor and volt tap of each segment would connect to PCB that spans length of segment

  • solid vs bolted nickel plates

• driver boards for precharge contactors

  • burn off extra voltage during startup when balancing voltage

  • internal to power systems

• same 3d printed brackets, new cell design

• 4 segments, 8 modules each, 9 cells in each module

• ignitions switch

  • remove controls from the process

• external integration

  • more modular/compact battery pack

  • HV Power Optimization with BPS

  • Ignition (No more controls, only with BPS

Data Aq

• 2nd Telemetry CAN bus

  • only data aq sensors

    • IMU, temp, steering, etc

  • peripheral daughterboard package

• Car CAN

  • messages from electrical systems

  • optimal speed output

• Wireless transmission to chase car via radio

  • XBEE

• Sensors

  • Peripheral Daughterboard

    • IMU

    • Humidity Sensor

    • Hall effect Sensor

    • Airflow Sensors

    • Temp Sensors

  • analog/I2C

• Hall Effect or Potentiometer on Steering Column

  • Hall effect will require extra shielding on the wiring

  • magnet placed on the steering column