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How to Bind with F4 Betaflight FC (SPI ExpressLRS Receiver)

Antony
  • Updated

Here is the binding procedure for the F4 Betaflight FC (SPI ExpressLRS Receiver)

This binding procedure could be used for the ELRS F4 1S 5A AIO FC and F4 1S 12A AIO V2.0 FC

Binding Procedure

There are two ways to bind with the receiver, as shown below

Button Binding

Put the receiver into bind mode using any of these steps:

  • "Bind" button in the Betaflight Configurator, Receiver Page (if can't be found, update the Betaflight firmware).

       mceclip2.png mceclip3.png

  • Using the CLI, type in BIND_RX and press enter once.

       mceclip5.png

  • Using the CLI, type in set expresslrs_uid = 0, press enter once, then save and reboot

       mceclip4.png

  •  Press the bind button on the flight controller.

mceclip11.pngmceclip14.png

 

After the receiver enters the binding state, the receiver indicator on the FC will flash quickly.

mceclip15.pngmceclip16.png

At this time, execute ERLS.Lua in the remote control, and then press the BIND button. You can also press the bind button on the remote control or TX module to make TX enter the bind mode. RX and TX will now complete the binding.

mceclip9.png

Please pay attention to the sequence of binding steps. First make RX enter binding mode and then TX.

 

Binding Phrase

The binding phrase is hashed into 6 bytes represented as numbers. These 6 bytes are referred to as the UID bytes. UID bytes are entered into the Betaflight CLI for binding. When building via ExpressLRS Configurator or via VS Code, note down the UID bytes from the build log. 

mceclip0.png

 

Setting Binding Phrase

The following commands need to be executed in the betaflight cli:

      set expresslrs_uid = [ Your UID bytes ]

      save

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After completing the phrase binding settings, the binding will be automatically completed after the receiver and remote control startup.

 

RF Mode Adjustment

These AIOs with ExpressLRS SPI Receivers are set to use 500Hz as default. To adjust it, you will need to go into Betaflight CLI and use the following commands:

      set expresslrs_rate_index = [your index]

      save

Where [your index] corresponds to the following :

  • 500Hz = 0
  • 250Hz = 1
  • 150Hz = 2
  • 50Hz = 3

For example, if I want to switch the refresh rate to 250Hz, I need to execute these commands in betaflight cli:

      set expresslrs_rate_index = 1

      save

mceclip2.png

 

ExpressLRS 1.x.x or ExpressLRS 2.x.x

ExpressLRS 1.x.x TX only works with Betaflight firmware for ExpressLRS 1.x.x, and upgrading the transmitter to ExpressLRS 2.x.x means flashing the flight controller with a different Betaflight version. If upgrading minor versions, such as from ExpressLRS 1.1.0 to 1.2.0 on the transmitter, no changes to the flight controller are needed although there may be bug fixes to the ExpressLRS Betaflight implementation as well.

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Comments

3 comments

Date Votes
  • Johnny

    There are two ways to bind the receiver,Button Binding and Binding Phrase.

    https://www.expresslrs.org/1.0/hardware/spi-receivers/

    0
  • Multisoft
    • Edited

    Hello, I buy F4 1S 12A AIO V2.2
    In this FC not work WiFi in ELRS?
    I want to install ELRS 3.1.1.
    I waited several minutes with the transmitter turned off but WiFi does not appear. I reconnected the power 3 and 4 times, but still WiFi does not work.

    I also have F4 5A AIO, WiFi works in it. But there ELRS work only with UART1, since ELRS does not work via SPI, you need to install Meteor65 firmware in it ELRS uses UART1.
    :(((

    0
  • Manulinicola

    I have Lite radio 3, I can't bind Pavo Pico FC F4 ELRS. I try for all day and night. I give up!!!

    I will install a external RX. 

    0

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