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Hello HN,I’m Talal Al-Suhaimi, a control systems and embedded engineer based in Saudi Arabia. I’ve spent the last several months designing and testing an open-source autopilot system for long-range, fixed-wing UAVs — and I&#x27;m excited to share it with the community.SmartNavX is a fully open-source flight controller firmware and hardware platform built on the STM32F405. It&#x27;s designed to be lightweight, efficient, and modular — offering full-stack autonomy for fixed-wing aircraft without relying on expensive or closed-source autopilots.Key features:
 Runs on low-cost STM32F405 (Blackpill or custom board)
 GPS-based autonomous navigation (waypoints, RTH, loiter, geofencing)
 Sensor fusion using IMU (MPU6050), barometer, and magnetometer with Kalman filtering
 Real-time telemetry via ExpressLRS UART (MAVLink-lite supported)
 Integrated smart BMS support for Li-Ion flight packs (voltage sag correction)
 Ground control compatibility (QGroundControl)
 Python CLI tool for live configuration and telemetry decoding
 Why I built this:
I needed a reliable, long-range UAV platform for mapping and data collection in remote desert areas, but wanted full control over both hardware and firmware. Most COTS solutions are either closed-source or too expensive for experimentation. So I built SmartNavX to be:Developer-friendly
Easily hackable
Hardware-agnostic
Suitable for both research and field use
 Resources:
 GitHub: github.com&#x2F;En-Talal-ALSohimiy&#x2F;SmartNavX
 Flight demo (26km autonomous desert flight):This project is still evolving — I&#x27;d love feedback from others working on UAVs, navigation, telemetry, or embedded systems. Contributions, suggestions, and collaborations are more than welcome.Thanks for reading,
– Talal Al-Suhaimi
Control Systems &amp; UAV Engineer

Open-source STM32 autopilot for long-range fixed-wing UAVs (SmartNavX)