Review: BetaFPV ELRS F4 1S 5A AIO Whoop FC

by Oscar
Betafpv 1s 5a Aio Fc Expresslrs Elrs Rx Tiny Whoop Flight Controller

This is one of the first FC with built-in ExpressLRS (ELRS) receiver – the BetaFPV F4 1S 5A AIO FC. It’s super light weight, perfect for brushless tiny whoops.

The new ELRS versions of the BetaFPV Meteor65 and Meteor75 are also powered by this FC. I have been flying this FC in the new Meteor75 and it’s been reliable.

Where to Buy?

BetaFPV: https://oscarliang.com/product-75oa

Betafpv 1s 5a Aio Fc Expresslrs Elrs Rx Tiny Whoop Top Close Up

Features and Specs

The board itself uses as little material as possible to keep the weight down.

  • F4 Processor
  • MPU6000 Gyro
  • Built-in ExpressLRS RX
  • Loaded with Betaflight 4.3, BLHeli 16.8
  • Input Voltage: 1S
  • 5A ESC (6A Burst)
  • 1 full UART, 1 half UART for VTX control (TX pin)
  • Buzzer pad for beeper
  • Dimension: 29x29mm
  • Weight: 3.1g

Here’s the pinout schematics.

Betafpv 1s 5a Aio Fc Expresslrs Elrs Rx Tiny Whoop Pinout

ExpressLRS Receiver Onboard

It has the ELRS 2.4GHz receiver built-in, with a ceramic antenna which makes it super compact. You don’t have to worry about mounting the RX antenna and worry about spinning propellers damaging it anymore.

Betafpv 1s 5a Aio Fc Expresslrs Elrs Rx Tiny Whoop Receiver Ceramic Antenna

The ELRS receiver is connected via SPI (not UART), so it’s setup slightly different in Betaflight (as explained on the product page, the receiver mode is set to SPI, and receiver provider is blank). But you don’t need to worry about the configuration as it’s all done in factory.

All you need to do is binding the FC to your radio by pressing the “Bind Receiver” button in the receiver tab. More info here.

The FC also has a SBUS pad in case you want to run an external receiver.

ESC and Motor Connection

It has motor connectors as well as solder pads, so you can either plug the motors directly to the board or solder your own.

Betafpv 1s 5a Aio Fc Expresslrs Elrs Rx Tiny Whoop Bottom Close Up

The ESC’s are rated at 5A continuous current, 6A burst. This is suitable for 65mm as well as 75mm 1S tiny whoops.

The ESC’s are preloaded with BLHeli 16.8, meaning RPM filter is enabled out of the box. RPM filter is great for whoops as it increases flight time up to 50%.

Upgrading existing whoops to this FC is pretty straight forward.

Betafpv 1s 5a Aio Fc Expresslrs Elrs Rx Tiny Whoop Flight Controller BuildUpdating ExpressLRS Firmware

The ExpressLRS SPI receiver firmware is part of the Betaflight firmware, so updating ExpressLRS can be done through updating Betaflight firmware. Configuration parameters can be set in CLI (not via the LUA script on the radio). More info here: https://github.com/betaflight/betaflight/pull/10788

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2 comments

Yaron 26th November 2021 - 3:12 pm

I ordered this. I has nothing but trouble with the HappeModel ELRS AIO board. The VTX there died.
I think it’s better to leave the VTX as separated component. CSFR nano VTX as less than 1 gram.
I have high expectations.

Reply
Andrew 26th November 2021 - 3:09 am

Hey Oscar, I would like to ask, are you aware of what version of ELRS these boards have? I know they come preflashed with a special Betaflight 4.3.0 hex file. I’m just not sure if it will be compatible with the current ELRS 1.2.0 version I have on my TX. Thanks!

Reply