BETAFPV F4 1S 5A AIO Brushless Flight Controller (ELRS 2.4G)

The classical ultralight F4 1S brushless FC comes back with SPI ExpressLRS 2.4G receiver.

Note: The default flight controller firmware only supports ELRS V1.0. However, this flight controller can work with ELRS V2.0 by flashing the Betaflight V4.3.0 RC1-RC3 firmware. The target file name is BETAFPVF4SX1280.

https://github.com/betaflight/betaflight/releases

SPECIFICATIONS OF FC

CPU: STM32F411CEU6 ( 100MHZ )

Six-Axis: ICM-20689/MPU-6000

Built-in Receiver: SPI ExpressLRS 2.4G

Receiver antenna: 2.4GHz SMD ceramic antenna

Size: 29mm x 29mm, fully mounting pattern compatible with the whoop frame in the current market

Firmware version: betaflight_4.3.0_STM32F411_norevision

OSD: Built-in BetaFlight OSD

Recommend VTX: >=200mW, like BETAFPV M03 350mW VTX or TBS Unify VTX

Power Cable: 55mm, with BT2.0 connector

Weight: 3.13g (no power cable included)

SPECIFICATIONS OF ESC

Power supply: 1S

Current: 5A continuous and peak 6A (3 seconds)

Support BLHeliSuite programmable

Factory firmware: O_H_5_48_REV16_8.HEX

Signal Support: D-shot150, D-shot300, D-shot600, Oneshot125, Multishot, PWM

Betaflight Firmware and CLI

Since Betaflight has not yet released the official firmware that could supports the SPI ExpressLRS protocol, the current version is the Beta version. Please use the firmware and the CLI dump file below to recovery the FC board if needed. Betaflight will update their official target soon. Please feel free to contact us if you have any issues with this Beta version Firmware.

It is normal that there is no option on Betaflight Configurator Receiver. As is shown below, the checkbox is blank.

Please change the “PID loop frequency” to “4KHZ” , sometimes it would make the SPI receiver not working correct while the value is “8KHZ”.

New released firmware BTFL_4.3.0_BETAFPVF4SX1280_0265565fa uses external GPIO interrupt triggers to process ELRS data reception, increasing the stability of the signal link. Now it can perfectly support LiteRadio 2 SE 500Hz link and modify the accuracy of signal strength.

The new CLI file is named BTFL_cli_F4 5A ELRS_NEW. Please check.

Note: The new firmware supports only ELRS 1.0.0, 1.0.1, 1.1.0, 1.2.0, 1.2.1.

Download the firmware and CLI dump file for the F4 1S 5A FC (ELRS 2.4G) board.

How to Bind with Betaflight FC with SPI ExpressLRS Receiver.

More details and discussion on Github about SPI ELRS receiver.

RECOMMENDED PARTS LIST

Battery: BT2.0 300mAh 1S Battery

Frame: Meteor65 frame / Meteor75 frame

Props: 31mm 4-Blades props (for 65mm frame) / 40mm 4-blades props (for 75mm frame)

Motors: 0603 motors / 0703 motors / 0802 motors

VTX: M03 25-350mW VTX

DIAGRAM

Larger motor pad for conveniencty solder directly.

PACKAGE

1 * F4 1S brushless flight controller (BT2.0 Connector)

4 * M1.2x4mm screws

4 * M1.4x5mm screws

4 * Anti-vibration rubber dampers