Power controller
Version 7.1 by Mathias Larsen on 2026/05/25 11:55
Microcontroller Pinout
The power controller uses a microcontroller to control the pumps, fans, buzzer, and brake light. It also features current monitoring and LED indicators. The Microcontroller used in this system is STM32G431CBT6 D
| Physical pin | Electrical pin | Description |
|---|---|---|
| 1 | VBAT | Power source from a backup battery if a RTC would be used (Connected to +3V3 in this case) |
| 5 | OSC_IN | Clock input (8MHz oscillator) |
| 7 | NRST | Negative reset which can be connected to a button (Connected to +3V3) |
| 8 | PA0 | Current 6 Supply 24V resserve |
| 9 | PA1 | Current 7 Supply 24V resserve |
| 10 | PA2 | Current 5 Supply sensor card |
| 11 | PA3 | Current 4 Supply front |
| 12 | PA4 | Current 3 Supply accumulator |
| 13 | PA5 | Current 2 Supply fans |
| 14 | PA6 | LED 9 |
| 15 | PA7 | LED 2 |
| 16 | PB0 | Current 8 Supply buzzer, brake light |
| 17 | PB1 | PWM enable Fan 1 |
| 18 | PB2 | V-sense |
| 19 | VSSA | Voltage source: Ground |
| 20 | VREF | Voltage reference (connected to +3V3)?? |
| 21 | VDDA | Voltage source: Power (+3V3) |
| 22 | PB10 | LED 8 |
| 23 | VSS | Voltage source: Ground |
| 24 | VDD | Voltage source: Power (+3V3) |
| 25 | PB11 | Current 1 Internal components |
| 26 | PB12 | Current 9 Supply 12 V Pumps inverter and datalogger |
| 29 | PB15 | PWM fan |
| 30 | PA8 | Enable buzzeer |
| 31 | PA9 | Enable brake light |
| 32 | PA10 | ASMS signal |
| 33 | PA11 | CAN bus RXD |
| 34 | PA12 | CAN bus TXD |
| 35 | VSS | Voltage source: Ground |
| 36 | VDD | Voltage source: Power (+3V3) |
| 37 | PA13 | SWDIO |
| 38 | PA14 | SWCLK |
| 40 | PB3 | LED 3 |
| 41 | PB4 | LED 4 |
| 42 | PB5 | LED 5 |
| 43 | PB6 | Enable Pump 1 |
| 44 | PB7 | Enable Pump 2 |
| 45 | PB8 | LED 6 |
| 46 | PB9 | LED 7 |
| 47 | VSS | Voltage source: Ground |
| 48 | VDD | Voltage source: Power (+3V3) |