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

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

The ultralight F4 1S 5A AIO Brushless Flight Controller is back in stock with new and upgraded features. Compared to the previous version, the new board uses Serial ExpressLRS 2.4G instead of SPI ELRS 2.4G so that it can support ExpressLRS V3.0 and also has a Frsky RX version to choose from. We updated the FC with high-quality BMI270 gyro and BB51 ESC hardware. In addition, this new board supports the Betaflight Blackbox function.

Please click here to F4 1S 5A AIO (ELRS 2.4G) if you need information about it.

Tons of ExpressLRS items are available now!

Two version choices for the FC board. Weighing only 2.96 grams, the Light version comes with NO motor connectors soldered. Therefore, pilots could directly solder the motor cables to the FC board, getting an ultimate lightweight drone for fast speed FPV racing.

Bullet Point

• Come with a Serial ExpressLRS 2.4G receiver, which can be updated via Wi-Fi or Betaflight serial passthrough. It is convenient for pilots to flash any version of ELRS RX firmware and especially can flash ExpressLRS V3.0 without updating flight controller firmware.
  
• Built-in an 8MB flash memory chip dedicated to Blackbox logging. It’s an extremely powerful tool for tuning and troubleshooting an FPV drone.
• Integrated motor pin connectors, it is easy to install motors without soldering work.
• Particular design with only 2.96g ultralight weight, reasonable layout, and easy to build. With a 26*26mm mounting hole size, it is fully compatible with the whoop frame in the current market.

Specification of FC

• CPU: STM32F411CEU6 (100MHZ)
• Six-Axis: BMI270
• Built-in Receiver: Serial ExpressLRS 2.4G
  
• Receiver antenna: Line antenna
• FC Size: 30*30mm
• Mounting Hole Size: 26*26mm
• Firmware version: betaflight_4.3.1_BETAFPVF411 (ELRS)
• OSD: Built-in BetaFlight OSD
  
• Blackbox: 8MB
• Recommend VTX: >=200mW, like BETAFPV M03 350mW VTX or TBS Unify VTX
  
• Power Cable: 55mm, with BT2.0 connector
• Weight: 2.96g (without motor connectors), excluding power cable

Specification of ESC

• Power supply: 1S
• Current: 5A continuous and peak 6A (3 seconds)
• ESC firmware: A_X_5_.HEX for BB51 BLHeli_S hardware
• Signal Support: D-shot150, D-shot300, D-shot600, Oneshot125, Multishot, PWM

The BLHeli_S firmware could support the BB51 hardware now. This board is powered by BB51 hardware. If you want to setup the ESC specification, please use the BLHeliSuite16714902A_Beta or ESC-Configurator.

• ESC-Configurator: https://preview.esc-configurator.com/
  
• Download BLHeliSuite16714902A_Beta here.
  
• Download the BB51 ESC firmware. Please choose A_X_5.HEX.
  

Note: BetaFlight Configurator, BLHeli Configurator, and Bluejay Configurator are invalid for the BB51 ESC now.

Serial ELRS 2.4G RX

Serial ELRS 2.4G RX uses the Crossfire serial protocol (CRSF protocol) to communicate between the receiver and the flight controller board. So the Serial ELRS 2.4G RX is available to support upgrading to ELRS V3.0 with no need to flash Betaflight flight controller firmware. Enter binding status by power on/off three times.

• Plugin and unplug the flight controller three times;
• Make sure the RX LED is doing a quick double blink, which indicates the receiver is in bind mode;
• Make sure the RF TX module or radio transmitter enters binding status, which sends out a binding pulse;
• If the receiver has a solid light, it's bound.

The Serial ELRS 2.4G RX can be updated via Wi-Fi or Betaflight serial passthrough. Here is the way to update the Serial ELRS 2.4G RX firmware through passthrough.

• Turn off telemetry in the Betaflight configurator.

• Power cycle, while holding the Boot button to put the ELRS receiver into the bootloader.

• Open the Betaflight configurator, exit DFU mode, and make sure the Betaflight is disconnected from the flight controller.
• Flash using the Passthrough option in ExpressLRS Configurator.

How to flash firmware via Wi-Fi here.

Betaflight Firmware and CLI

F4 1S 5A AIO Brushless Flight Controller comes with the default firmware betaflight_4.3.1_BETAFPVF411 (ELRS). The default firmware for Serial ExpressLRS 2.4G RX version supports ELRS V2.4 RX.

Pay attention, For the Serial ExpressLRS 2.4G version, ONLY the Betaflight firmware 4.3.0 and up start to support this BMI270 gyro.

Note: The RX RSSI values drop when the flight controller is installed on the quadcopter with HD digital VTX (Walksnail or HDZero). For example, the theoretical failsafe RSSI values for 250Hz packet rate are -108dBm. Actually, the RX will be possibly lost in control when the RX RSSI values reach about -92dBm.

Connecting External RX/HD Digital or Analog VTX 

Both Serial ExpressLRS 2.4G RX and SPI Frsky RX version support external HD digital VTX or Analog VTX. Please note that the SPI Frsky RX version reserves an SBUS port and a UART port, which is available for the SBUS protocol receiver or other external receivers. You can refer to the below picture.

Recommend Parts

• 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 / 1102 brushless motors
  
• VTX: M03 25-350mW VTX 

Package

• 1 * F4 1S 5A AIO Brushless Flight Controller (Serial ELRS 2.4G) Light Version
  
• 4 * M1.2x4mm Screws
• 4 * M1.4x5mm Screws
• 4 * Anti-vibration Rubber Dampers
• 8 * Motor Pin Connectors