The RF Magic Behind ExpressLRS
Drone pilots have come to expect control links that remain solid for kilometers, but few stop to think about the engineering that makes it possible. Modern long-range systems like ExpressLRS (ELRS) can maintain reliable control over huge distances using transmitters limited to about one watt of output power. In a recent video, Stan Coene of the OpenDrone YouTube channel takes a detailed look at how these systems work, explaining both the hardware and the radio frequency design techniques that allow them to hear signals buried beneath the background noise.
At the core of every ELRS receiver is an ESP32 microcontroller that manages communications with the flight controller. The radio duties are handled by Semtech's SX1280 or SX127x LoRa transceivers, depending on whether the design targets the 2.4 GHz or 900 MHz bands. Aside from that, you'll find typical supporting hardware, including a 3.3-volt regulator, status LED, boot button, and either...
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