SX1278 LoRa RA-02 433MHz Wireless Transceiver Module

LoRa exists for exactly the gap between a nRF24L01's short range and a cellular module's cost and power draw: this SX1278-based module trades data rate for distance, reaching up to 15 kilometres in open, ideal conditions on a fraction of the power a WiFi radio would need. That range comes from a spread-spectrum modulation technique rather than raw transmit power, which is also why it tolerates interference far better than a simple RF link.

Communication is over SPI, with receiver sensitivity down to -148dBm - sensitive enough to pull a signal out of noise levels that would lose a weaker radio's transmission entirely. The 1.8V to 3.7V supply range matches low-power microcontroller and battery-powered sensor node designs directly.

Common uses are remote field sensors reporting back over kilometres rather than metres, LoRaWAN gateway and node projects, and any IoT deployment where the sensor sits too far from WiFi coverage but a full cellular module is more cost and power than the project can justify.