Specification
- Weight: 5.58g (without motor connectors and power cable),5.92g (with motor connectors)
- Mounting Hole Size: 26mm x 26mm
- CPU*: STM32F405RGT6 (168MHz)
- Six-Axis: ICM42688P (SPI connection)
- RX: Serial ELRS 2.4G Receiver
- RX firmware version: BETAFPV AIO 2400 RX ELRS V3.3.0
- Antenna: Enameled wire
- Blackbox Memory: 16MB
- Sensor: Barometer (BMP280/DSP310), Voltage & Current
- 5V BEC*: 5V 3A@8V supply
- 9V BEC*: 9V 2A@8V supply
- USB Port: SH1.0 4-Pin
- Built-in ESC with 20A continuous and peak 25A current
- ESC input voltage: 2-3S
- FC firmfware version: Betaflight_4.4.1_BETAFPVF405
- ESC firmware: C_X_70_48_V0.19.2.hex for BB51 Bluejay hardware
- Signal support: D-shot300, D-shot600
*The output current of BEC will decrease as the temperature increases
Disable on board ELRS RX
Power cutoff: Removing the chip bead disconnects the power supply, and to reuse the onboard ELRS receiver, soldering the solder pads together restores power.
UART3 release: Removing two resistors on the solder pads releases UART3. The left side is TX3, and the right side is RX3. To reconnect, solder the solder pads together when reusing the onboard ELRS receiver.
Change VCC voltage of HD VTX connector (9V / 5V)
Voltage Switch: The HD VTX connector defaults to 9V. The chip bead is soldered between the 9V pad and the middle pad. To use WalkSnail Avatar HD mini 1s and Lite, please ensure the power supply voltage is 5V. Remove the chip bead first from the 9V pad and solder it between the middle pad and the 5V pad. Alternatively, you can use solder instead the chip bead to switch between the 5V and 9V pads.
Motor choice: Avoid selecting motors with excessively high KV ratings, as motors above 20,000KV are prone to burn.
FC firmware: Betaflight_4.4.1_BETAFVF405
ESC Firmware
With BB51 ESC solution, F4 2-3S 20A AIO FC V1 is based on BLHeliSuite16714903 with Bluejay ESC firmware, it supports bidirectional D-shot and RPM filtering in Betaflight, offers 24KHz, 48KHz, and 96KHz fixed PWM frequency for options, and custom start-up melodies. F4 2-3S 20A AIO FC V1 default factory setting is 48KHz and it doesn’t recommend upgrading the 96KHz, or it might cause an error in the motor idle setting, not spinning when disarmed.
DO NOT flash the firmware with a shorter interval, otherwise, there will be a certain chance of stalling and burning the flight controller.
*** As there are two RGB LED on the bottom side of the FC, LED_strip is used and can't be resourced to other purpose. To use PINIO to control COB LED, user has to resource other TX or RX to control BEC for COB. Recommand to use TX1 pad.
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