Yes—but the documented example is a specific reverse-engineering project, not proof that any inexpensive drone can run PX4. In 2021, Michael Melchior adapted PX4 for a SimToo Moment Hoshi 007PRO airselfie drone with an STM32F405 flight-management unit. The work involved hardware mapping, firmware and bootloader configuration, communications, drivers, and PWM testing; the reported result was a maiden takeoff, not a fully validated or autonomous aircraft.
What the project changed
Melchior began with a practical goal: salvage the motors and propellers from the SimToo Moment Hoshi 007PRO. Inspecting its flight controller and peripherals led him to investigate replacing the proprietary firmware with PX4. His ten-post series ran from March 15 to April 12, 2021. Read the project series.
The price descriptions in contemporaneous coverage are historical and differ by publisher and currency: Melchior described the purchase package as “less than 100 Euros,” while Hackaday called it a “$100 drone.” Neither description establishes a current price. Hackaday’s April 24, 2021 summary describes the hardware and project.
Why this airframe could be adapted
The aircraft’s flight-management unit used an STM32F405. Melchior inspected board layouts and traces, located SWD programming pads, and determined that the microcontroller’s read protection blocked firmware extraction while still allowing programming. That access made a custom-firmware attempt possible; it does not mean the original firmware was recovered.
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Hackaday’s project summary lists an IMU, magnetic compass, barometric pressure sensor, GPS, Wi-Fi radio, tilting camera, optical-flow sensor, ultrasonic distance sensor, batteries, and charger alongside the STM32F405RG flight-management unit. This is an inventory of the specific aircraft as reported, not a specification for inexpensive drones generally.
What a PX4 port required
Compiling PX4 was only one part of the conversion. Melchior used PX4’s existing Crazyflie configuration as a starting point, then adjusted board configuration and pin mappings, created an airframe-specific target, and configured a bootloader. The port also had to connect the aircraft’s actual hardware and communications to the autopilot software.
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- Board and firmware setup: map the controller’s pins and hardware to PX4, and set up the bootloader for the target.
- Communications: connect the flight controller to QGroundControl and account for separate TCP ports for inbound and outbound traffic.
- Sensors and peripherals: integrate existing modules and drivers, and write drivers for the barometer and “smart” battery. The series also addresses GPS and the camera’s Wi-Fi video stream.
- Motor control: configure PWM outputs and their limits, then test the outputs before reassembling the aircraft.
- Configuration: set and calibrate parameters for the hardware and airframe.
For network investigation, the project account describes using a Raspberry Pi for Wi-Fi man-in-the-middle analysis. It also covers inspecting board traces, using a logic analyzer, and decoding unfamiliar serial protocols. These were methods used in this particular investigation, not a universal conversion recipe.
What the maiden flight did—and did not—show
In the April 12, 2021 maiden-flight post, Melchior reports a takeoff in a confined area after testing PWM outputs and reassembling the aircraft. He says the optical-flow and ultrasonic distance sensors were not in use at that point. He also wrote, “I will do more flight tests outside and try to capture some videos”—an intention stated in that post, not evidence that those later tests occurred.
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The account therefore documents a successful initial takeoff, but does not establish completed outdoor testing, broad flight validation, or an autonomous mission. Those distinctions matter: a motor test or brief takeoff is not equivalent to demonstrating that every sensor, flight mode, and safety behavior works reliably.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to judge another drone as a PX4 candidate
This case establishes that one particular airframe could be adapted with substantial embedded-systems work. It does not establish compatibility for other SimToo units, later revisions, or inexpensive drones as a category. Before treating another aircraft as a viable PX4 candidate, investigate the following:
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- Flight-controller MCU and memory: identify the exact controller and confirm that the intended PX4 build can fit and run on it.
- Programming and debug access: determine whether there are accessible programming pads or another supported route to load firmware. Read protection may prevent reading existing firmware without preventing new programming, as reported in this case.
- Sensor and peripheral interfaces: identify how the IMU, compass, barometer, GPS, radio, and other devices connect, and whether suitable PX4 drivers and configurations exist or can be developed.
- Motor-control requirements: verify the ESC signal type, output pins, PWM behavior, and limits before attempting flight.
- Board-specific PX4 support: check whether a suitable board configuration, target, bootloader setup, and compatible drivers are available. A configuration for a different board may help as a starting point but is not a drop-in port.
PX4 describes itself as open-source flight-control software for drones and other unmanned vehicles, with user and developer documentation at its official website. That general description does not verify that the SimToo target from the 2021 project remains maintained or works with current PX4 releases. Treat present-day compatibility as unestablished unless confirmed against current PX4 documentation and a maintained target.
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