When building a lightweight FPV drone, space and weight savings often take precedence over modularity. That’s where all-in-one (AIO) flight controllers come in—offering a neat, integrated solution by combining the flight controller and electronic speed controller (ESC) onto a single board. Among the options available today, the SpeedyBee F405 AIO has earned attention for balancing performance, affordability, and convenience.
In this article, we’ll take a deep dive into the key specifications, use cases, and overall value proposition of the SpeedyBee F405 AIO to help you decide if it fits into your next FPV build.
- What Is the SpeedyBee F405 AIO?
The SpeedyBee F405 AIO is a compact all-in-one flight controller featuring the STM32F405 processor and a built-in 4-in-1 40A ESC. It supports 3S–6S LiPo input, comes pre-flashed with Bluejay firmware for smooth motor response, and includes integrated Bluetooth for wireless configuration through the SpeedyBee App.
With its 25.5×25.5mm mounting pattern and lightweight form factor, the F405 AIO is especially well-suited for whoop-style drones, toothpicks, and other micro builds where space is limited.
- Key Features of the SpeedyBee F405 AIO
2.1 STM32F405 MCU for Stable Performance
At the heart of the board is an STM32F405 microcontroller—a proven chipset known for its reliability and compatibility with Betaflight. It delivers stable flight performance and supports features such as dynamic filtering and RPM filtering.
2.2 Integrated 40A 4-in-1 ESC with Bluejay Firmware
The onboard ESC supports up to 40A of continuous current, making it powerful enough for most 3–4” and even some lightweight 5” builds. Pre-installed Bluejay firmware offers smooth motor startup, low throttle control, and bidirectional DShot for RPM filtering.
2.3 Built-In Bluetooth Module
Like many SpeedyBee products, the F405 AIO includes Bluetooth support, allowing you to tune your drone directly from your smartphone using the SpeedyBee App. This is particularly useful for field adjustments without a laptop or wiring.
2.4 Compact 25.5×25.5mm Mounting Layout
The board is designed around a whoop-style mounting pattern, which fits snugly into a wide range of smaller frames. This layout makes it an attractive choice for toothpicks, cinewhoops, and sub-250g builds.
2.5 Ample UARTs and BEC Options
Despite its compact form, the SpeedyBee F405 AIO offers three UARTs and integrated 5V and 9V BECs, providing flexibility for connecting accessories like receivers, GPS modules, and HD video systems.
- Where to buy
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- Advantages of the SpeedyBee F405 AIO
4.1 Efficient Use of Space
By combining the flight controller and ESC on a single PCB, the SpeedyBee F405 AIO eliminates the need for separate stacks and wiring between components. This not only simplifies the build process but also reduces total weight—something that’s critical for sub-250g drones.
4.2 Seamless Configuration Experience
Bluetooth tuning through the SpeedyBee App continues to be a major convenience for users. Whether adjusting PID settings, flashing firmware, or reviewing logs, the wireless interface helps streamline drone setup and troubleshooting.
4.3 Bluejay ESC Compatibility
Bluejay firmware provides enhanced motor control and supports RPM filtering, which improves flight smoothness and responsiveness. It’s particularly valued in lightweight builds where motor noise filtering is essential for maintaining stable flight.
- Points to Consider Before Buying
While the SpeedyBee F405 AIO is feature-rich, it’s important to assess whether it aligns with your build requirements:
- No Onboard Barometer: If you’re building a GPS-enabled quad and require altitude hold, you may need to add an external barometer or adjust your expectations.
- Limited Expansion: With only three UARTs, adding multiple peripherals (GPS, ELRS, DJI OSD, etc.) could require compromises or additional components like softserial.
- ESC Layout for Smaller Builds: In extremely tight frames, the layout and solder pad locations may require careful planning to avoid interference or wire overlap.
- Ideal Use Cases for the SpeedyBee F405 AIO
This AIO board is an excellent fit for:
- Toothpick-style drones (2.5–3”)
- Cinewhoops for indoor or close-range cinematic shots
- Compact sub-250g builds where every gram and every millimeter of space matters
- Budget-conscious FPV pilots who still want Bluetooth app integration and modern firmware features
While it may not be the go-to for high-powered 5” race quads or long-range platforms, it offers more than enough performance for micro drones and beginner-friendly builds.
- SpeedyBee App Integration: A Strong Selling Point
A highlight of the SpeedyBee ecosystem is the mobile app, which offers an intuitive interface for configuring everything from PID tuning to flashing firmware. With the F405 AIO, you can wirelessly connect via Bluetooth, removing the need for physical connections at the field—a feature especially appreciated during maiden flights and quick tests.
The app also supports firmware backups, blackbox log analysis (if SD card logging is enabled externally), and motor testing.
- Build Experience & User Feedback
Most builders report that the SpeedyBee F405 AIO installs easily thanks to its logical pad layout and detailed wiring guides. The large solder pads help reduce build time, even for pilots with limited soldering experience.
Community feedback highlights the board’s reliability in real-world use and its ability to support powerful motors without overheating or desyncing. However, users do advise careful frame compatibility checks, especially for builds with tight spacing or non-standard stack heights.
- Final Thoughts: AIO Convenience Without Cutting Corners
In summary, the SpeedyBee F405 AIO delivers a strong mix of performance and convenience in a compact form factor. It brings many features typically found in larger stacks—such as Bluetooth tuning and bidirectional DShot—to smaller drones that demand lightweight components.
While it has some limitations in terms of peripheral expansion, its strengths make it a smart choice for micro builds that prioritize simplicity and reliability.
Whether you’re building your first 3-inch freestyle quad or need a reliable brain for a cinewhoop, this all-in-one board is worth serious consideration.