HOW DOES IT WORK?

LR 9 Click is based on the RA-08, a LoRaWAN module from Ai-Thinker Technology. This module is made for ultra-long-range spread spectrum communication tasks powered by the ASR6601. The ASR6601, an LPWAN wireless communication system-on-chip (SoC), combines RF transceivers, modems, and a 32-bit RISC microcontroller (MCU). The embedded MCU, leveraging an ARM core, operates at a frequency of 48MHz. The RA-08 is designed to work with LoRa modulation and the conventional (G)FSK modulation within the LPWAN domain. Furthermore, it supports BPSK and (G)MSK modulation for transmission, with the receiver accommodating (G)MSK modulation.

Designed for LPWAN applications, the RA-08 module delivers long-distance, ultra-low power connectivity. It finds its applications in various sectors, including smart metering, supply chain and logistics management, building automation for homes, security systems, and remote-controlled irrigation systems. Diving deeper into the specifics, the module supports a frequency range from 410MHz to 525MHz and can transmit at a maximum power of +22dBm. It boasts embedded storage with 128KB of FLASH and 16KB of SRAM, alongside support for several sleep modes, with a deep sleep current as low as 0.9uA.

Additional functionalities of the LR 9 Click include communication capabilities with the host MCU via a UART interface, set by default to a baud rate of 115200bps. A switch on the board allows the selection of the UART interface's function—either as the main serial communication port for exchanging AT commands (in the LPRX position) or as a serial port for firmware flashing (in the RX position). Moreover, for developers looking to build their software from scratch, the module also includes I2C communication capabilities.

The board does not limit itself to UART and I2C interface pins; it also features pins like the RST pin for module resetting (which can also be achieved through a RESET button) and a BT pin for firmware flashing (accessible through a BOOT button). This makes programming and software development a breeze through the SWD interface pins on the board's right side. Also, an RGB LED serves as a module status indicator and is configurable by the user.

LR 9 Click also features the SMA antenna connector with an impedance of 50Ω, compatible with various antennas available from MIKROE, like the Rubber Antenna 433MHz, to enhance its connectivity.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

SPECIFICATIONS