Happymodel VRX-Backpack EP82 Rapidfire

This is the Happymodel VRX-Backpack EP82, a innovative new product from Happymodel and the ELRS team.

⚠️ Radio Use Notice: Operation of this product must comply with local laws and licence requirements. Users are responsible for safe and legal use.

What is a “TX Backpack”?

Some of the ExpressLRS TX modules include an additional ESP8285 chip, which lets us communicate wirelessly with other ESP8285 enabled devices using a protocol called espnow. We call this chip the “TX-Backpack”. The aim of the TX-Backpack is to allow wireless communication between ExpressLRS, and other FPV related devices for command and control, or for querying config.

Sounds interesting… What type of FPV devices can it talk to?

A prime use case is your video receiver module (or VRX). Currently there aren’t many VRX modules that have an ESP8285 built in to allow them to communicate with ExpressLRS, so in most cases you need to add your own. A small ESP based receiver can be “piggybacked” onto your VRX module, which allows ExpressLRS to control the band and channel that your goggles are set to. We call this device the “VRX-Backpack”.

Wow cool, so I’ll be able to control the module via ELRS!? Which VRX modules does it work with?

The list of supported modules can be found on the

wiki: https://github.com/ExpressLRS/Backpack/wiki

More information

⚠️ Important Note on Radio Use

This product uses radio frequencies. Please make sure you use it responsibly and in line with local laws.

• Some power levels or modes may need a licence to operate legally.
• Always fly and operate in a way that avoids interference or safety risks.
• By using this product, you accept responsibility for complying with the rules where you live.

For further details, please refer to the UK’s Radio Equipment Regulations 2017 and Electromagnetic Compatibility Regulations 2016.

https://github.com/ExpressLRS/Backpack

EP82 Backpack

• MCU:  ESP8285
• Weight: 0.37gram
• Size: 10.5mmx10.5mmx3.5mm