LoRaSerial 915MHz Enclosed Kit

This kit gives you a pair of enclosed serial radio modems for sending serial data from one point to another over LoRa. It is designed for applications that need simple, reliable data reporting beyond typical WiFi or Bluetooth® range.

The radios use a 1 Watt 915MHz transceiver and an open-source protocol to send AES-encrypted data. SparkFun reports regular 9mi (15km) line-of-sight transmissions using two LoRaSerial radios with a larger 5.8dBi antenna on the transmitter and the stock 1/2 wave dipole antenna on the receiver.

LoRaSerial supports point-to-point links as well as multipoint broadcasts, making it useful for GNSS RTK and other geospatial setups where one device needs to share data with multiple receivers. Pairing is handled with a simple training button method that generates and shares a new random network ID and AES encryption key.

The radios are configurable for frequency, channels, dwell time, power output and other settings to help suit local requirements. LoRaSerial operates at the physical layer of LoRa and is not intended for LoRaWAN networks.

Features:

• LoRa SX1276 Based
• 256-bit AES GCM encryption
• AT command set
• Built-in Frequency Hopping Spread Spectrum (FHSS) technology
• Point-To-Point and Multipoint configurations
• 3D Printed Enclosure (May darken over time)
• USB-C connection available for industrial systems and single-board computers (SBCs like Raspberry Pi)
• 6-pin JST connector available for embedded systems (5V and 3.3V tolerant I/O) with flow control
• Small footprint, lightweight, easily mountable
• Open source Software and Hardware

Specifications:

• Power output: 1 Watt (30dBm) power output
• Radio band: 915MHz unlicensed band radio with 902-928MHz configurable output
• Air speeds: Configurable air speeds from 400 bps (40 bytes per second) to 19200bps (1920 bytes per second)
• Standard serial data rates: Configurable standard serial data rates from 2400 to 115200bps
• RSSI indicator: 4-LED RSSI Indicator
• Operation: 3.3 to 5V operation

Documentation available from SparkFun includes a schematic, Eagle files, quick start guide, product manual, AT command set, datasheets, LoRa PHY notes and hardware repository.