FIRM v1.0¶

This was the second PCB iteration of FIRM, finalized and ordered on February 6, 2026.

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Hardware Overview¶

The following sections describe the microcontroller, sensors, peripherals, and power components.

Microcontroller and Related Components¶

• Microcontroller: STM32F405RGT6
• 12 MHz high-speed external crystal
• 32khz low-speed external crystal

Sensors¶

• IMU: ICM45686
• Barometer: BMP581
• Magnetometer: MMC5983MA
• High-G Accelerometer: ADXL371
• Voltage/Current Sensor: INA219

Storage¶

• Main logging storage: Micro-SD
• Device settings storage: W25Q128JV

Power¶

• USB-C or PWR/GND pinouts to supply power
• MIC5219 voltage regulator (12V, 500mA max)