ExpressLRS_STM32_915M

ExpressLRS is an open source RC linker for RC applications. It is based on SX127x  /  SX1280 hardware, combined with ESP8285 , ESP32 or STM32 for RX and TX respectively. ExpressLRS supports both 900 MHzand 2.4 GHzhardware options. ExpressLRS uses LoRa modulation at all packet rates for optimal packet transmission range and consistency.

ExpressLRS can be flashed into existing Frsky R9M hardware (RX and TX) to make a GHOST ATTO/ZEPTO receiver or custom PCB . It can run up 500hzor down 50hzdepending on your range or low latency preference.

The 900 MHzmaximum 200 Hzpacket rate is supported. The A 2.4 GHz-Bubble 500 Hzis currently working with custom openTX binaries and plans to extend it to support 1000 Hzonce OpenTX support is added. This makes ExpressLRS one of the fastest RC links available while still delivering long-range performance.

ExpressLRS is designed for optimal link performance in speed/latency and range. However, due to optimized packet structure, only basic telemetry is provided. If you want MavLink, this project is not for you. ExpressLRS uses a compressed packet structure that prioritizes the first 4 control channels, which gives it better raw performance than other commercial solutions. ExpressLRS is also very affordable, with a TX module costing $30 and the receiver $15-20. Likewise, new/used Frsky R9M gears are also compatible and cheap.