Pixhawk无人机教程-7.5 PX4FMU Overview

Overview of the PX4 Flight Management Unit

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The PX4 Flight Management System Includes:

The PX4-FMU (Flight Management Unit).

A powerful Cortex M4F microcontroller and flash memory for controlling flight and communications.
A socket for a plug in SD memory card.
A 3 axis gyro for determining orientation.
A 3 axis Accelerometer for determining outside influences.
A Magnetometer for determining compass heading.
A Barometric pressure sensor for determining altitude.
A Connection for an externally mountable UBLOX LEA GPS for determining absolute position.
Stackable board interconnections for adding various peripheral boards.
Communications interfaces for USB, JTAG and Serial connections.
Connections for PPM-SUM RC radio input and servo outputs.

The PX4-IO (Input Output) Board.

Contains its own on board microcontroller and stacks with the FMU.
Direct battery input power supply.
8 High speed servo PWM outputs.
Futaba SBUS or PPM-SUM serial servo output.
A variety of PPM-SUM / SBUS input connectors.
Two user assignable relays, two 1/2 amp 5 volt outputs and an analog input port.

The PX4-FLOW Smart (Optical Flow) Camera.

Specialized downward pointing camera module that uses ground texture and features to determine aircraft motion over the ground.
The PX4 Flow has the same powerful Cortex M4F Microcontroller as is used in the PX4FMU.
The built in microcontroller performs on board automated binned pixel image analysis to determine motion relative to ground.
A built in 3 axis gyro enables automatic compensation for variance in aircraft tilt angle.

The PX4-IOAR Quad Carrier is a specialized interface board for the Parrot AR.Drone.

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The PX4 FMU circuit board comes preassembled and ready to load the firmware for your airframe using the Mission Planner.

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Detailed Description

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The Back of the PX4 FMU showing the SD card carrier and buzzer socket:

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PX4FMU Connector Diagram

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