BetaFPV F4 2-3S 20A AIO FC V1 ELRS

The BetaFPV F4 2-3S 20A AIO FC packs an F405 flight controller, a 20A 4-in-1 ESC and a serial ExpressLRS 2.4GHz receiver onto one 26x26mm board, built to drive a DJI O3 or Walksnail Avatar HD system on 2-3S LiPo.

Key features

• Solder-free 6-pin PMU connector feeds the DJI O3 air unit directly, with a dedicated 9V/2A BEC that holds VTX voltage steady under hard throttle; the same pad switches to 5V for Walksnail Avatar HD Mini/Lite.
• Onboard serial ELRS 2.4GHz receiver needs no separate RX module and updates independently over Betaflight passthrough or Wi-Fi.
• 20A continuous / 25A peak BLHeli_S-based ESC, Bluejay-ready, suited to 1103-1404 class whoop motors.
• Onboard barometer plus current and voltage sensing feed altitude hold and battery telemetry back to the radio.
• Four spare UARTs plus SBUS leave room for GPS, an external receiver or other peripherals.
• Weighs 5.58g bare (5.92g with motor connectors), light enough for sub-4-inch whoop builds.

Specifications

• MCU: STM32F405
• Gyro: ICM42688P or ICM42605
• Barometer: BMP280 or DPS310
• Blackbox: 16MB
• Input Voltage: 2S-3S
• ESC Current: 20A continuous, 25A peak
• ESC Firmware: BLHeli_S / Bluejay
• ESC Protocol: DShot300, DShot600
• BEC: 9V 2A (HD air unit) and 5V 3A
• HD VTX Connector: 6-pin plug for DJI O3 / O4 Pro
• Receiver: Integrated serial ELRS 2.4GHz
• USB: SH1.0 4-pin
• Mounting Size: 26x26mm
• Weight: 5.58g (bare)
• UARTs: 4 + SBUS

Pair it with a Pavo Pico or Pavo20-class frame and a DJI O3 or Walksnail air unit for a low-wiring 2-3S cinewhoop build.