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Supported VRX Modules

The VRX-Backpack can be used with the following video receiver modules:

VRX Module	Support
ImmersionRC Rapidfire	✔️ Fully supported
Generic RX5808 Module	✔️ Fully supported
FENIX Module	✔️ Fully supported
TBS Fusion	❌ Not yet supported (check back soon)

Supported VRx-Backpack Targets

Backpack Target	Compatibility	Tested?
Happy Model EP1/EP2	✔️ Compatible	Yes
Happy Model ES900RX	✔️ Compatible	Yes
BETAFPV Nano 2.4	✔️ Compatible	No
Flywoo EL24E	✔️ Compatible	No
Flywoo EL24P	✔️ Compatible	No
Ghost ATTO	❌ Not compatible	N/A
HappyModel PP	❌ Not compatible	N/A
HGLRC 2400RX	✔️ Compatible	No
JHEMCU / HiYOUNGER EP24S	✔️ Compatible	No
JHEMCU / HiYOUNGER SP24S	✔️ Compatible	No
JHEMCU / HiYOUNGER RX24T	❓ Unsure	No
Matek R24-S	✔️ Compatible	No
Matek R24-D	✔️ Compatible	No
Namimno Flash (ESP)	✔️ Compatible	No
QuadKopters Nano	✔️ Compatible	No
SIYI FR Mini	❌ Not compatible	N/A

Wiring guides for adding the VRX-Backpack to your module:

• Using an off the shelf ExpressLRS receiver on Rapidfire
• Using an off the shelf ExpressLRS receiver on RX5808 Module
• Using a DIY ESP01f and regulator on Rapidfire
• Using a DIY ExpressLRS Nano RX PCB on Rapidfire

Pin Mapping

For more information on what each pin is being used for, see:

• Pin Description

Operation

LED

• Solid = On and waiting to receive packets.
• Rapid continuous flashing = WiFi has turned on. Connect to the "ExpressLRS Backpack" access point and open http://10.0.0.1 in your browser. From here firmware can be uploaded.
• Double flash and pause = Binding mode. Press the Bind button in your ELRS TX LUA script to bind the TX backpack to the VRx Backpack.

Button

• Hold down during power up to force boot mode. Firmware can now be flashed with a FTDI dongle.
• Single press during Normal or Binding mode will restart the Backpack into WiFi mode.
• Single press during WiFi mode will restart the Backpack into normal mode.

Binding

Just like the ELRS receiver, a binding phrase can be used when flashing Backpacks. When used your TX and VRx Backpacks will instantly be bound.

-DMY_BINDING_PHRASE="default ExpressLRS binding phrase"

To enter Binding mode manually when a binding phrase has not been defined, power cycle the Backpack 3 times in a row. Turning on and off only needs to be done within 30s, and not 2s like the ELRS receivers. This provides enough time to power cycle your goggles and VRx module kindly.

Using the button to enter and exit WiFi mode can also be used to power cycle the Backpack 3 times and enter Binding mode.

Timeouts

• When in Binding mode and no bind packets have been received within 120s, the VRx Backpack will switch to WiFi mode. This provides a method of entering WiFi mode when a VRx Backpack is not bound and the button can not be used.