Flight Controller HALYCHYNA F405 v3 8S

Brand: 603700 FPV. This flight controller is designed specifically for FPV drones with a 10" frame size — an ideal choice for camera builds and aircraft with heavy payloads.

Brief Overview

HALYCHYNA F405 v3 8S is based on the powerful MCU STM32F405RGT6 and the modern ICM42688P inertial module, ensuring precise stabilization and reliable sensor operation. The controller supports popular Betaflight, INAV, Ardupilot, and Milbeta firmwares, has a built-in OSD based on AT7456, and a DPS310 barometer for accurate altitude measurement. The integrated MicroSD slot allows for Blackbox log recording for subsequent flight analysis.

Power and BEC

Two BEC Units
The board features two independent BECs: a fixed 5V 3A and a programmable 5V/9V/12V 3A. Voltage selection for the second BEC is done via a jumper that needs to be soldered on the board. In some configurations, the second BEC can power a homing board or other peripherals.

Outputs, Servo, and Expansion

Three Servo Outputs
S1 is located next to the camera for convenient connection of a pan/tilt mechanism, while additional S2 and S3 are used to control an initiator or other servos. The controller has 6 outputs for ESCs (M1-M6) with PWM and DSHOT support, allowing for the assembly of a hexacopter for increased payload capacity.

PINIO
Two controllable PINIO outputs with 5V/1A switching capability for connecting additional peripheral devices.

Interfaces
Six UART interfaces allow connection of a receiver, GPS, telemetry, and other modules. I2C, 2*ADC (VBAT, Current), SBus with a built-in inverter on R5, and a buzzer output are available.

Functionality

The board is pre-configured for the most popular 10" build and in most cases is ready for its first flight without additional setup. Support for video channel switching during flight helps avoid interference and cross-signal impact from other drones. The launch point hiding feature ensures safety: in case of video signal interception, the OSD temporarily covers most of the image, making it impossible to determine your position.

Technical Specifications

• MCU: STM32F405RGT6
• Gyroscope/Accelerometer: ICM42688P
• Firmware: Betaflight, INAV, Ardupilot, Milbeta
• OSD: AT7456
• Barometer: DPS310
• Blackbox: MicroSD slot
• Power: 3-8S
• Interfaces: 6*UART, I2C, 2*ADC (VBAT, Current), SBus with built-in inverter on R5, buzzer output
• ESC Outputs: 6 pcs (M1-M6, PWM, DSHOT)
• Servo Outputs: 3 pcs (S1, S2, S3)
• BEC: 2 pcs — 5V 3A and 5V/9V/12V 3A (voltage selection via jumper on board)
• PINIO: 2 pcs, output voltage 5V 1A
• Dimensions: 38*38 mm
• Mounting Holes: 30.5*30.5 mm, M3

The HALYCHYNA F405 v3 8S Flight Controller — a reliable and functional board for amateurs and professionals building FPV drones with increased demands for power, number of servos, and extended interfaces. The combination of modern sensors, multi-firmware support, two BECs, and extensive connectivity options makes this board a versatile solution for camera and cargo configurations. With HALYCHYNA F405 v3 8S, you get stable flight control, the ability to record flight data, and easy integration of additional modules.

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