These are circuit boards, two are supplied, that allow you to build a very compact long distance transmitter and receiver for LoRa using a small number of components. The board is powered by the Seeeduino XIAO SAMD21 or XIAO RP2040 processor board, which are tiny, powerful and low cost microcontrollers with plenty of memory that you can program with the Arduino IDE.

There are example Arduino programs in the board repository showng how to use the board for LoRa communications, as a GPS tracker and test programs for wakeups, displays and GPSs. There is also a program that uses the board as a very easy to build TTN LoRaWAN sensor node.

Note this is the supply of the PCB only, you will need to supply your own XIAO and RFM9X modules, wires and solder.

The XIAO and RFM9X modules are surface mounted on either side of the PCB so reasonable soldering skills are needed. There is very little other assembly to do, just solder some wires and maybe pin headers and your done.

There are connectors on the board for a battery and for external digital IO, I2C and Serial UART devices. The documentation repository has Arduino sketches for using the board as a very compact GPS tracker transmitter or receiver with OLED display. Also examples for using a BME280 for remote temperature, pressure and humidity monitoring.

You can fit a reverse supply protection diode for the battery connection but its not mandatory. There are I2C pull up resistors that can be fitted for external I2C devices, but these are often not necessary. On one IO pin you can fit a resistor for driving an external LED or or use a pair of resistors for as a voltage divider and read external voltages.

You need to check that you can program the Seeeduino XIAO board with the Arduino IDE before soldering it to this PCB. For details on how to install the Arduino IDE for the XIAO see the Seeeduino provided documentation.