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If you would like to support the development of ExpressLRS please feel free to make a small donation. This helps us buy hardware for porting, development and prototyping. Show your support for which new features you want added by leaving a message when you donate

If you have hardware that you want to flash, please refer to our guides on the wiki, and our FAQ

ExpressLRS is an open source RC link for RC applications. It is based on the fantastic semtech SX127x/SX1280 hardware combined with an ESP8285, ESP32 or STM32. ExpressLRS supports a wide range of hardware platforms as well as both 900 MHz and 2.4 GHz frequency options. ExpressLRS uses LoRa modulation as well as reduced packet size to achieve best in class range and latency compared to current commercial offerings.

ExpressLRS can run at various packet rates, up to 500hz or down to 25hz depending on your preference of range or low latency. At 900 MHz a maximum of 200 Hz packet rate is supported. At 2.4 GHz a blistering 500 Hz is currently supported with a custom openTX binary with future plans to extend this to 1000 Hz.

ExpressLRS can be flashed into existing Frsky R9M hardware (RX and TX), Jumper R900 RXs, GHOST ATTO/ZEPTO Receivers or Custom PCBs can be made if you enjoy tinkering. Several manufacturers are preparing to offer offical ELRS hardware soon so stay tuned.

ExpressLRS aims to achieve the best possible link preformance for both latency and range. This is achieved with an optimised over the air packet structure. However, only basic telemetry is currently provided (VBAT, downlink/uplink LQ and downlink/uplink RSSI), work is underway for full telemetry support. This compromise allows ExpressLRS to achieve simultaneous better latency AND range compared to other options in the market. For example, ExpressLRS 2.4GHz 150Hz mode offers the same range as GHST Normal while delivering near triple the packet update rate. Similarly, ExpressLRS 900MHz 200Hz will dramatically out-range Crossfire 150Hz and ExpressLRS 50Hz will out-range Crossfire 50Hz watt per watt.

2.4GHz Comparison

More information can be found in the wiki.

After taking a look at the supported Hardware and making sure you have the required hardware, the Quick Start Guide is written to walk through the process of flashing ELRS for the first time

• TX
  • FrSky R9M (2018) (Full Support, requires resistor mod)
  • FrSky R9M (2019) (Full Support, no mod required)
  • FrSky R9M Lite (Full Support, power limited)
  • TTGO LoRa V1/V2 (Full Support, V2 recommended w/50 mW power limit)
  • Namimno Voyager 900 TX (Full Support off the shelf)
  • HappyModel ES915TX (Full Support off the shelf)
  • DIY Module (Full Support, 50mW limit, limited documentation)
• RX
  • FrSky R9mm (Full Support, OTA version can be used)
  • FrSky R9 Mini (Full Support, OTA version can be used)
  • FrSky R9mx (Full Support)
  • FrSky R9 Slim+ (Full Support, OTA version can be used, diversity not yet implemented)
  • Jumper R900 mini (Full Support, only flashable via STLink, Bad Stock antenna)
  • DIY mini RX (Full Support, supports WiFi Updates)
  • DIY 20x20 RX (Full Support, supports WiFi Updates)
  • HappyModel ES915RX (Full Support off the shelf)
  • Namimno Voyager 900 RX (Full Support off the shelf)

• TX
  • DIY JR Bay (Full Support, 27dBm, supports WiFi Updates)
  • DIY Slim TX (Full Support, 27dBm, supports Wifi Updates, fits Slim Bay)
  • DIY Slimmer TX (Full Support, 27dBm, supports Wifi Updates, fits Slim Bay)
  • GHOST TX (Beta Support, 250 mW output power)
• RX
  • GHOST Atto (Full Support, Only STLink Flashing)
  • GHOST Zepto (Full Support, Only STLink Flashing)
  • DIY 20x20 RX (Full Support, easy to build. WiFi Updating)
  • DIY Nano RX (Full Support, CRSF Nano Footprint, WiFi Updating)
  • DIY Nano CCG RX (Full Support, CRSF Nano Pinout, STM32 Based)
  • DIY Nano Ceramic RX (Full Support, CRSF Nano Footprint, WiFi Updating, Built in antenna)

For a more exhaustive list refer to the Supported Hardware page on the wiki

One of the most frequently asked questions that gets asked by people who are interested in, but haven't yet tried ELRS is "How far does it go, and at what packet rate?"

The following table is a leaderboard of the current record holder for each packet rate, and the longest distance from home. Note that not every flight resulted in a failsafe at max range, so the link may go (much) futher in some cases.

Anyone can add an entry to the table, and entries should include the:

• Max distance from home
• RF freq (900 / 2.4)
• Packet rate
• Power level
• If the link failsafed at max range
• The pilot name
• A link to your DVR on youtube (DVR is essential to compete, sorry, no keyboard claims)

Check the wiki page for previous leaders!

The use and operation of this type of device may require a license and some countries may forbid its use. It is entirely up to the end user to ensure compliance with local regulations. This is experimental software/hardware and there is no guarantee of stability or reliability. USE AT YOUR OWN RISK