The SpeedyBee F4 3-6S 20x20 Stack/Combo (F405 FC / 35A 8bit 4in1 ESC)! Experience feature-rich performance and an unbeatable price for a 20x20 stack. Utilizing an upgraded F405 flight controller chip with better performance than the F411, it features a built-in Bluetooth chip for seamless wireless Betaflight tuning. The board comes with a 4-level battery voltage display, built-in barometer, and supports connectivity to all DJI Air Units. It offers 4 available UART ports, and a dual BEC setup with 5V 2A and 9V 3A outputs. This ESC provides four synchronized outputs with a continuous current of 35A, delivering strong power to drive all 2-4 inch and lightweight 5-inch quadcopters via 4-6S battery. Equipped with a TVS transient suppression diode onboard, it better absorbs surge voltage, providing enhanced protection for the ESC.
Product Name: SpeedyBee F405 Mini BLS 35A 20x20 Stack
Flight Controller: SpeedyBee F405 Min
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 Download & 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
SpeedyBee F405 V3 30x30 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 Download & 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.
The SpeedyBee F4 Mini 3-6S 20x20 Stack/Combo offers excellent value with its budget-friendly price and high-quality performance. Customers appreciate its affordability, reliability, and ease of setup. The stack is praised for its solid performance and compatibility with various DJI Air Units.
"Excellent stack with top quality features." — Gerel M.
"Great little stack at a great price!" — ERik S.
"Plenty of UARTS and good sized pads for such a small stack." — ERik S.
Reviews
SpeedyBee F405 Mini Stack
"Installed in a Volador VX 3. 5". Plenty of space to solder for a mini stack. Lots of connectivity for a quad I'm going to pimp out with GPS and LED's. I fly a casual style of cruising the hood, light freestyle, and backyard race gate crashing. Hasn't let me down at all."
— Mark M. (5/5)
Great little stack
"The Speedy Bee F4 mini stack performs really well in my drone and as far as I have seen speedy bee products have exceptional quality."
— Christopher B. (5/5)
SpeedyBee Mini
"Excited to integrate these minis! Great packaging and presentation upon initial opening and great price in my opinion!"
— Jacob S. (5/5)
Really nice
"Perfect fit and performs very very well I am impressed especially for the price"
— rick c. (5/5)
?
"Still in the box and sealed"
— John H. (5/5)
Great little FC, cheap and works
"I put the F405 mini on an AOS 3. 5" V5 frame with some 1404 motors. Tuned easily, stays consistent. I flashed the ESC to bluejay for Bidirectional DShot and it didnt complain. Would reccomend for a small sub250 if you have a light vtx"
— Karl L. (5/5)
Sturdy board for the price
"Would have liked this board to have a connector for the dji system, but it works great as intended."
— James S. (4/5)
Wrong time of year to get tech help.
"At this time I can't give an unbiased review of this stack. It seems to be a good combo but right from the git go it presented problems trying to get it setup. I'm working with the manufacturer to solve the problem but the Chinese New Year celebrations are delaying that communication. Eventually we'll get it sorted out then I can give a fair review."
— Steve (3/5)
Speedybee stack F405 20x20
"Works greeeaaat 💪"
— Dany L. (5/5)
love this fc
"great fc for the money"
— dylan j. (5/5)
Q&A
Does the speedy bee f405 mini work with INAV ? Does the speedy bee f405 mini support I2C...? ....If so, might one connect an I2C splitter via DA & CL pads?
Yes, It will work with INAV and ArduPilot.
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