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PX4 Handbook

An intuitive engineering reference to PX4 internals — architecture, flight stack, control allocation, flight modes, system startup, and quick-reference cheatsheets.

This handbook is a structured engineering reference to the PX4 autopilot, distilled from the official PX4 Developer Guide. It covers system architecture, the flight stack pipeline, controller diagrams, flight modes, control allocation, system startup, and quick-reference cheatsheets for everyday engineering work.

Use the sidebar to navigate directly to any topic, or browse the section index below.

Section Index

SectionTitle
1PX4 System Architecture
2Flight Stack (Estimation & Control)
3Controller Diagrams
4Flight Modes
5Flight Tasks
6Control Allocation (Mixing)
7PWM Limit State Machine
8Parameters & Configs
9uORB Pub-Sub Messaging
10System Startup & Boot Scripts
11Flight Modes Cheat Sheet
12Common Parameters Cheat Sheet
13Key uORB Topics Cheat Sheet
14PX4 Shell Commands Cheat Sheet

Updated April 2026

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Source: docs.px4.io

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