A compact USB adapter removes software complexity from LoRa development, enabling rapid radio testing, configuration and automation through simple serial AT commands alone.
Ropixon has introduced the AT-USB LoRa Dongle, a compact USB adapter designed to simplify long-range radio development by eliminating the need for embedded firmware and software development kits during early testing. By exposing the full capabilities of the Semtech SX1262 LoRa transceiver through simple AT commands, the device enables developers to configure, test and automate wireless links directly from a computer using a standard USB connection.
Instead of requiring a software development kit or custom firmware, the adapter appears as a virtual COM port over USB. This allows users to send and receive raw LoRa packets, modify radio parameters and control onboard GPIO pins using straightforward text commands. The simplified workflow helps engineers begin testing immediately from terminal software, Python scripts or other serial applications.
The hardware combines a LoRa transceiver with a microcontroller that manages radio operation. Developers can configure key settings, including operating frequency, transmit power up to +22 dBm, spreading factor, bandwidth, coding rate, preamble length, synchronisation word, CRC, IQ inversion and header mode. Independent transmit and receive settings also allow a wide range of real-world LoRa devices to be emulated without changing firmware.
Beyond radio configuration, the adapter supports point-to-point communication, RF characterisation, packet sniffing and sensor network development. Received packets include RSSI data for signal quality analysis, while built-in Time-on-Air and symbol timing calculations help optimise wireless performance before field deployment.
The board also provides eight auxiliary GPIO pins that can be controlled through AT commands to switch digital outputs or generate PWM signals up to 1 kHz. With support for frequencies from 150 MHz to 960 MHz, compatibility with standard serial tools and Python scripting examples for automation, the adapter is designed to shorten development cycles and simplify testing for engineers building LoRa-based wireless applications.
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