Pixhawk 4 Flight Controller

The Pixhawk 4 is an advanced flight controller designed by Holybro and Auterion for the PX4 autopilot platform. Built around an STM32F765 ARM Cortex-M7 processor (216 MHz, 2 MB flash, 512 KB RAM) with a dedicated STM32F100 I/O co-processor, it delivers the processing power needed for complex autonomous flight algorithms.

The board features dual IMUs (ICM-20689 and BMI055), an IST8310 magnetometer, and an MS5611 barometer — all with vibration isolation and dedicated data-ready interrupt lines for precise time-stamped sensor data. PX4 firmware comes preinstalled on a NuttX real-time operating system.

Key Features

• STM32F765 FMU Processor – 32-bit ARM Cortex-M7 at 216 MHz with 2 MB flash and 512 KB RAM
• STM32F100 I/O Co-Processor – 32-bit ARM Cortex-M3 at 24 MHz for servo/PWM output
• Dual IMU – ICM-20689 and BMI055 accelerometer/gyroscope with vibration isolation
• Magnetometer & Barometer – IST8310 magnetometer and MS5611 barometric pressure sensor
• PX4 Preinstalled – Ready to fly with the latest PX4 firmware on NuttX RTOS
• Extensive I/O – 8–16 PWM outputs, 3 capture inputs, R/C input (CPPM, Spektrum/DSM, S.Bus)
• Expansion Buses – 2 external SPI buses (6 chip selects), 4 I²C buses (2 external, 2 for GPS/Compass)

Specifications

• FMU Processor – STM32F765, ARM Cortex-M7, 216 MHz
• I/O Processor – STM32F100, ARM Cortex-M3, 24 MHz
• Accelerometer/Gyro – ICM-20689 + BMI055 (dual redundancy)
• Magnetometer – IST8310
• Barometer – MS5611
• PWM Outputs – 8–16 (8 from I/O, 8 from FMU)
• Power Module Output – 4.9–5.5 V, up to 120 A current sensing
• USB Power Input – 4.75–5.25 V
• Operating Temperature – −25 °C to +85 °C
• Dimensions – 44 × 84 × 12 mm
• Weight – 33.3 g

Ideal For

• Autonomous drones and multirotor builds
• VTOL and fixed-wing UAV platforms
• Autonomous vehicle and robotics research
• PX4 and ArduPilot development

Resources

• Pixhawk 4 Documentation (PX4 Guide)