Introduction
This manual provides detailed instructions for the installation, operation, maintenance, and troubleshooting of your SpeedyBee F405 Mini Stack Flight Controller and BLS 35A V2 4-in-1 ESC. Please read this manual thoroughly before using the product to ensure safe and optimal performance.
Features
- Built-in Barometer for altitude sensing.
- Dual BECs: 5V 2A and 9V 3A for powering various components.
- Sufficient 4 x UARTs available for peripheral connections.
- Onboard 8MB blackbox storage for flight data logging.
- Supports DJI Air Unit O3/Link/Vista for digital video transmission.
- Wireless motor direction changes via the SpeedyBee app.
- Onboard 4-level battery life indicators for quick status checks.
- Equipped with a 470uF Rubycon High-frequency Low-ESR capacitor for stable power.
- Full wireless Flight Controller (FC) and Electronic Speed Controller (ESC) configuration via the SpeedyBee app.
Specifications
SpeedyBee F405 Mini Flight Controller
- Barometer: Built-in
- BLE Bluetooth: Supported
- WiFi: Not supported
- Power Input: 3-6S Lipo
- Mounting: 20x20mm, 3.5mm hole size (Compatible with M2 and M3 screws/silicone grommets)
- Dimension: 32mm(L) x 35mm(W) x 14.2mm(H)
- Weight: 13.5g
SpeedyBee 35A BLHeli_S Mini V2 4-in-1 ESC
- Firmware: BLHeli_S J-H-40
- Continuous Current: 35A*4
- ESC Protocol: DSHOT300/600
- Power Input: 3-6S LiPo
- Mounting: 20x20mm, φ3.5mm hole size (Compatible with M2 and M3 screws/silicone grommets)
- Dimension: 35*35*5.5mm
- Weight: 7.2g
Package Contents
The package contents vary based on the selected option:
Option 1 - SpeedyBee F405 Mini BLS 35A 20x20 Stack
- SpeedyBee F405 Mini Flight Controller x 1
- SpeedyBee 35A BLHeliS Mini V2 4-in-1 ESC x 1
- Manual & App Download Card x 1
- 35V 470uF Capacitor x 1
- 8pin JST cable (For FC & ESC Connection) x 1
- DJI 6-pin Cable (80mm) x 1
- XT30 Power Cable (Length: 7cm) x 1
M2 Accessories:
- M2 Silicone O-Ring x 5
- M2 Nylon Hex Nut x 5
- M2 (Hole Diameter) * 7.6mm (Height) Anti-vibration Silicone Grommets x 9
- M2 (Diameter) * 25mm (Length) Screw x 4
- M2 (Diameter) * 20mm (Length) Screw x 4
M3 Accessories:
- M3 Silicone O-Ring x 5
- M3 Nylon Hex Nut x 5
- M3 (Hole Diameter) * 6.6mm (Height) Anti-vibration Silicone Grommets x 9
- M3 (Diameter) * 25mm (Length) Screw x 4
- M3 (Diameter) * 20mm (Length) Screw x 4
Option 3 - SpeedyBee BLS 35A Mini V2 20x20 4-in-1 ESC (Standalone)
- SpeedyBee 35A BLHeliS Mini V2 4-in-1 ESC x 1
- M2 (Hole Diameter) * 7.6mm (Height) Anti-vibration Silicone Grommets x 5
- M2 Silicone O-Ring x 5
- Manual & App Download Card x 1
- M3 (Hole Diameter) * 6.6mm (Height) Anti-vibration Silicone Grommets x 5
- M3 Silicone O-Ring x 5
- 35V 470uF Capacitor x 1
- 8pin JST cable 30mm (For FC & ESC Connection) x 1
Setup and Installation
Mounting
The F405 Mini Stack is compatible with both M2 and M3 mounting hole sizes. Two sets of M2 and M3 screws and silicone grommets are included in the package to accommodate various frame designs.
Wiring Diagram
Refer to the comprehensive wiring diagram below for connecting various components to your SpeedyBee F405 Mini Flight Controller.
ESC Power Connection
To prevent the stack from being burnt out by voltage spikes during power-up, it is strongly recommended to use the Low ESR capacitor included in the package. Connect the 470uF Low-ESR Capacitor and XT30 Power Cable as shown in the diagram.
DJI Digital Video Transmitter Support
The flight controller features two independent BECs (9V 3A and 5V 2A) and supports various analog image transmissions above 5V. It also supports DJI O3 Air Unit / Link / Vista / Air Unit V1.
Cable Connection vs DJI O3 Air Unit
Use the DJI 6-pin cable (80mm) that comes with the F405 Mini stack (accessory No.6 in the package section). Cut off the 8-pin connector and keep the 6-pin connector. Use the 6-pin connector to connect to the DJI O3 Air Unit, and then solder the other end to the flight controller.
Cable Connection vs RunCam Link/Caddx Vista Air Unit
Use the DJI 6-pin cable (80mm) that comes with the F405 Mini stack (accessory No.6 in the package section). Cut off the connectors on both ends and solder the 6 wires directly to the flight controller and the RunCam Link/Caddx Vista Air Unit.
Cable Connection vs DJI Air Unit V1
Use the DJI 6-pin cable (80mm) that comes with the F405 Mini stack (accessory No.6 in the package section). Cut off the 6-pin connector and keep the 8-pin connector. Use the 8-pin connector to connect to the DJI Air Unit V1, and then solder the other end to the flight controller.
Operating Instructions
Wireless Tuning via SpeedyBee App
The SpeedyBee F405 Mini Stack allows for wireless configuration of both the flight controller and ESCs using the SpeedyBee app via Bluetooth. This eliminates the need for USB cables for tuning.
To tune your drone wirelessly:
- Power on your quadcopter.
- Connect to the SpeedyBee app on your smartphone via Bluetooth.
- Configure UART Ports, PID settings, OSD, and other flight controller parameters.
- Adjust any BLHeli_S ESC parameters as needed.
Changing Motor Directions Wirelessly
You can easily change motor directions without connecting to a computer using the SpeedyBee app.
To change motor directions:
- Open the SpeedyBee app.
- Navigate to App > Motors > Motor Direction Settings.
- Follow the on-screen instructions to adjust motor directions.
Onboard Battery Level Indicator
The flight controller features a 4-level battery capacity indicator. Once the battery is connected, you can instantly see the battery level without needing to use FPV goggles or an external checker.
Indicator levels:
- X4: 75%-100%
- X3: 50%-75%
- X2: 25%-50%
- X1: <25%
Maintenance
ESC Protection
The ESC is built with a TVS protective diode to absorb voltage spikes when plugging in the battery or during crashes that block your props. Additionally, a Rubycon 470uF Low-ESR capacitor is provided to ensure clean data from the gyroscope to the flight controller.
Clean Gyroscope Power Supply
The gyroscope receives independent power through a MaxLinear's LDO power supply chip, boosting surge protection capacity by 320%. A 100uF ultra-large filtering tantalum capacitor further guards the gyroscope's data from interference, ensuring precise responsiveness during flight.
Troubleshooting
Important Notice for ELRS Receiver
We recommend connecting the ELRS receiver's TX and RX to the T2 and R2 pads on the flight controller. However, when using the DJI Air Unit simultaneously, some ELRS receivers may not be recognized properly by the flight controller. If you encounter this issue, you need to disconnect the SBUS signal wire from the Air Unit harness. You can use tweezers to pick out the SBUS wire from the 6-pin harness connector (or directly cut this wire) and insulate the exposed part of the wire carefully.
Important Notice for SBUS Receiver
When using an SBUS receiver, the SBUS signal wire of the receiver must be connected to the SBUS pad on the front side of the flight controller (this pad internally uses UART2). If you are also using the DJI Air Unit (O3/Link/Vista/Air Unit V1), you will need to disconnect the SBUS signal wire from the Air Unit harness. Failure to do so will prevent the SBUS receiver from being properly recognized by the flight controller. You can use tweezers to pick out the SBUS wire from the 6-pin harness connector (or directly cut this wire) and insulate the exposed part of the wire carefully.
Warranty and Support
This product is covered by a standard manufacturer's warranty against defects in materials and workmanship. For specific warranty terms, technical support, or service inquiries, please contact the retailer or manufacturer directly. Keep your proof of purchase for warranty claims.
