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The SparkFun SARA-R5 LTE GNSS Function Board is a robust development tool for u-blox's impressive SARA-R510M8S module. The SARA-R510M8S combines u-blox's UBX-R5 cellular chipset with their M8 GNSS receiver chipset to provide a 5G-Ready wireless IoT device complete with positioning data all on a single chip. As an asset tracker, the LTE GNSS Function Board offers Secure Cloud LTE-M communication for multi-regional use and has an integrated u-blox M8 GNSS receiver for accurate positioning information.

The UBX-R5 chipset supports many different forms of data communication from full TCP/IP sockets and packet switched data, through HTTP Get/Put/Post, FTP (the SARA has a built-in file system), or ping to good old SMS text messaging! The built-in u‑blox M8 GNSS receiver provides accurate and reliable positioning with a separate GNSS antenna interface for an external antenna. Both the GNSS antenna and LTE connections are made via a pair of u.FL connectors. A nano SIM card slot is also included as well.

Utilizing our handy M.2 MicroMod connector, no soldering is required to connect it to your system. Simply match up the key on your processor and function board's beveled edge connector to their respective key on the M.2 connector, then secure them to the Main Board with screws.

This Function Board provides access to the UART (default configuration) with a Processor Board. The USB pins are also broken out to a USB-C connector for diagnostic purposes. Status LEDs are included for 3.3V, Ring Indicator, LTE ON, and LTE Network Indicator. A button is included for LTE Power On.

Required Materials

To follow along with this tutorial, you will need the following materials. You may not need everything though depending on what you have. Add it to your cart, read through the guide, and adjust the cart as necessary.

* Note

If you use your own SIM card, please check that your chosen service provider offers LTE-M coverage for your area before purchasing.


The SMA connections on the antennas are standard polarity. Antennas with reverse-polarity connectors are not suitable when connecting to the LTE GNSS Function Board and u.FL to SMA cables.

Suggested Reading

If you aren't familiar with the MicroMod Ecosystem, we recommend reading here for an overview.

If you aren’t familiar with the following concepts, we also recommend checking out a few of these tutorials before continuing.