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The SpeedyBee F405 Mini BLS 35A 20x20 Stack is a compact flight controller and ESC stack designed for FPV drones, lightweight builds and performance-oriented multirotors. It combines the SpeedyBee F405 Mini Flight Controller with the SpeedyBee BLS 35A Mini V2 4-in-1 ESC, providing a convenient electronics solution for compatible drone builds. The stack supports 3–6S LiPo batteries and uses a 20×20mm mounting pattern.
The SpeedyBee F405 Mini BLS 35A 20x20 Stack is designed to save space while providing the essential electronics required for an FPV drone. The F405 Mini flight controller provides multiple UART connections, while the integrated 35A 4-in-1 ESC handles motor control.
One of the useful features of this stack is Bluetooth connectivity. The flight controller and ESC parameters can be configured through the SpeedyBee App without requiring a physical USB connection for every adjustment. Bluetooth is available through UART4 when the required MSP settings are enabled.
The integrated SpeedyBee BLS 35A Mini V2 4-in-1 ESC provides 35A continuous current per channel and supports up to 45A burst current for five seconds. It supports DShot300 and DShot600 protocols and operates with 3–6S LiPo power.
The ESC also includes current sensing and is designed to provide stable power delivery for compatible FPV motor setups. Always match the ESC with motors and propellers that remain within the recommended electrical limits.
The flight controller in the SpeedyBee F405 Mini BLS 35A 20x20 Stack is based on an STM32F405 processor and is designed for Betaflight FPV applications. It provides six UARTs, including a dedicated UART for Bluetooth connectivity and another for ESC telemetry.
The board also supports I2C connectivity, a buzzer connection, a BOOT button and an onboard barometer. These features provide additional flexibility when configuring an FPV drone with peripherals such as GPS, receivers and other compatible devices.
A major advantage of the SpeedyBee F405 Mini BLS 35A 20x20 Stack is wireless configuration through the SpeedyBee App. Pilots can use Bluetooth to configure flight-controller parameters and ESC settings without repeatedly connecting a USB cable.
This can make field adjustments and routine configuration more convenient. Bluetooth functionality requires the appropriate MSP setting on UART4 and a baud rate of 115200.
The SpeedyBee F405 Mini BLS 35A 20x20 Stack uses a 20×20mm mounting pattern with 3.5mm mounting holes and is compatible with M2 and M3 screws or silicone grommets. The stack measures approximately 32 × 35 × 15.2mm and weighs approximately 13.5g.
Its compact format makes it suitable for smaller FPV builds where reducing electronics size and weight is important.
The stack supports 3–6S LiPo batteries, providing flexibility for different FPV drone configurations. Battery selection should always be matched with the motors, propellers and ESC specifications of the complete build.
For best results, verify the expected current draw of your motors and propellers before installation.
The SpeedyBee F405 Mini BLS 35A 20x20 Stack is suitable for compatible FPV drones where a compact flight controller and 4-in-1 ESC combination is preferred. Its F405 processor, multiple UARTs, Bluetooth configuration and 35A ESC provide a practical electronics package for lightweight and performance-oriented builds.
| Product Name | SpeedyBee F405 Mini BLS 35A 20x20 Stack |
| Flight Controller | SpeedyBee F405 Mini |
| ESC | SpeedyBee BLS 35A Mini V2 4-in-1 ESC |
| Bluetooth | Supported. Used to connect with the SpeedyBee App for flight controller and ESC parameter configuration. Please make sure the MSP switch on UART 4 is turned on and set to a baud rate of 115200, otherwise Bluetooth functionality will not be available. |
| WiFi | NOT Supported |
| Wireless FC Firmware Flashing | NOT Supported |
| Wireless Blackbox Dwonload & Analysis | NOT Supported |
| Power Input | 3-6S LiPo |
| Mounting | 20 x 20mm 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 |
| ProductName | SpeedyBee F405 Mini Flight Controller |
| MCU | STM32F405 |
| IMU(Gyro) | ICM42688P |
| USB Port Type | Type-C |
| Barometer | Built-in |
| OSD Chip | AT7456E chip |
| BLE Bluetooth | Supported. Used to connect with the SpeedyBee App for flight controller and ESC parameter configuration. Please make sure the MSP switch on UART 4 is turned on and set to a baud rate of 115200, otherwise Bluetooth functionality will not be available. |
| Wireless FC Firmware Flashing | NOT Supported. Please connect to the Betaflight configurator on the PC to do FC firmeare update |
| Wireless Blackbox Dwonload & Analysis | NOT Supported. Please connect to the Betaflight configurator on the PC to do blackbox analysis. |
| WIFI | Not supported |
| DJI Air Unit Connection Way | Direct soldering |
| DJI Air Unit Compatibility | Compatible with all DJI Air Units: DJI O3/RunCam Link/Caddx Vista/DJI Air Unit V1. Please use the solder pads < 9V, G, T1, R1, G, SUBS(R2) > on the front right corner of the flight controller to make a pin-to-pin connection with the solder pads on the DJI Air Unit. UART1(T1, R1) is used for OSD and SUBS(R2) is used for DJI Air Unit’s internal SBUS receiver signal input. |
| Blackbox | 8MB Onboard Flash |
| BetaFlight Camera Control Pad | Yes(CC pad on the front side) |
| Current Sensor Input | Supported. For SpeedyBee BLS 35A V2 ESC, please set Scale=250 and Offset=-500. |
| Power Input | 3-6S LiPo. The flight controller is powered through the G, V wires of the 8pin harness or G, V pads from the bottom side of the flight controller. |
| 5V Output | 4 groups of 5V output, three +5V pads and 1 BZ+ pad( used for Buzzer) on front side. The total current load is 2A. |
| 9V Output | 1 group of 9V output, one +9V pad on front side. The total current load is 3A. |
| 3.3V Output | Supported. Soldering pad named ‘3V3’ on the front top of the flight controller. Designed for 3.3V input receivers. Up to 500mA current load. |
| 4.5V Output | Supported. Designed for radio receiver and GPS module even when the FC is powered through the USB port. Up to 1A current load. |
| ESC Signal | M1 - M4 wires or soldering pads on bottom side. |
| UART | 6 sets(UART1, UART2, UART3, UART4(Dedicated for Bluetooth connection)), UART5(Dedicated for ESC telemetry),UART6 |
| ESC Telemetry | UART R5(UART5) |
| I2C | Supported. DA & CL pads on front side. Used for magnetometer, sonar, etc |
| Traditional Betaflight LED Pad | Supported. 5V, G and LED pads on bottom of the front side. Used for WS2812 LEDs controlled by the Betaflight firmware. |
| Buzzer | BZ+ and BZ- pad used for 5V Buzzer |
| BOOT Button | Supported. Press and hold BOOT button and power the FC on at the same time will force the FC to enter DFU mode, this is for firmware flashing when the FC gets bricked. |
| RSSI Input | Not Supported |
| Smart Port / F.Port | Not Supported |
| Supported Flight Controller Firmware | BetaFlight(Default), INAV |
| Firmware Target Name | SPEEDYBEEF405MINI |
| Mounting | 20 x 20mm 3.5mm hole diameter ，Compatible with M2 and M3 screws/Silicone grommets. |
| Dimension | 30(L) x 32(W) x 7.8(H)mm |
| Weight | 9.6g |
| ProductName | SpeedyBee 35A BLHeli_S Mini V2 4-in-1 ESC |
| Firmware | BLHeli_S J-H-40 |
| Continuous Current | 35A * 4 |
| Burst Current | 45A(5seconds) |
| ESC Protocol | DSHOT300/600 |
| Power Input | 3-6S LiPo |
| Power Output | VBAT(Battery voltage, used to power the flight controller) |
| Current Sensor | Support (Scale=250 Offset=-500) |
| ESC Telemetry | Not supported |
| Mounting | 20 x 20mm ∅3.5mm hole size，compatible with M2 and M3 screws/Silicone grommets. |
| Dimension | 35 * 35 * 5.5mm |
| Weight | 7.2g |
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