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SparkFun Pro RF - LoRa, 915MHz (SAMD21)

The SparkFun Pro RF is a LoRa®-enabled wireless board that marries a SAMD21 and a long-range RFM95W to make a compact and easy-to-use IoT Arduino board. With its fast MCU and excellent point to point data transmission in the 915MHz ISM band with LoRa Capabilities, the Pro RF is a great choice for anyone interested or experienced in utilizing long range data communication.

Every pin on the SparkFun Pro RF is accompanied with a ground connection making the buttons and LEDs easy to connect. In case you're building something to be embedded into clothing or other physically harsh environment the antenna includes a stress relief hole to make sure your wire antenna survives. A short (3 inch) wire antenna is sufficient for "short" distances (up to 1 mile line-of-sight), but we've also included a u.FL antennae connector for potentially longer distances.

The Pro RF also includes a power switch and 2-pin JST connector for powering from a lithium battery. With a Micro-B USB and the power switch in the off position, the Pro RF will charge the attached battery! The board programs over a reinforced Micro-B connector with a slim reset button that fits nicely on the side of the board. We’ve even added our popular Qwiic connector to the edge of the board making it incredibly easy to add sensors and actuators without the need for solder or a soldering iron!

Thanks to the Arduino LoRa library, the RFM95W radio is an easy to use packet radio. But it doesn’t stop there because closing a few jumpers on the underside of the SAMD21 Pro RF initiates LoRaWAN mode on the radio module making it a node in a distributed sensor network.

  • SAMD21G18A
    • Cortex M0+
    • 256KB Flash Memory
    • 32MHz External Oscillator
    • 4 Digital and 5 Analog IO Pins with exclusive GND pins
  • Hope RFM95W LoRa modem
    • Point to Point Radio capabilities
    • LoRa Enabled
    • Frequency range: 915 MHz
    • Spread factor: 6-12
    • Range up to 1 mile line of sight
    • U.FL Antenna
  • LiPo Battery Charger
    • 500mA Charge Rate
  • Qwiic Enabled
  • Power LED disconnect jumper for low power applications.
  • PTH pins for software debug (SWD)

Revision Changes: On this revision of the SAMD21 Pro RF, we have made a few changes to improve the board, listed below. If users are unsure about which version they purchased, please refer to the product pictures.

  • Fixed the VDDCORE pin connection issue
  • Broken out an LED jumper for low power applications
  • Added PTH pins for software debug (SWD)

SparkFun Pro RF - LoRa, 915MHz (SAMD21) Product Help and Resources

Adding More SERCOM Ports for SAMD Boards

February 4, 2019

How to setup extra SPI, UART, and I2C serial ports on a SAMD-based boards.

LoRaWAN with ProRF and The Things Network

July 3, 2018

Learn how to make a LoRaWAN node for your next long range IoT project and connect it to the internet with The Things Network!

ARM Programming

May 23, 2019

How to program SAMD21 or SAMD51 boards (or other ARM processors).

Three Quick Tips About Using U.FL

December 28, 2018

Quick tips regarding how to connect, protect, and disconnect U.FL connectors.

Secure DIY Garage Door Opener

January 16, 2020

Did you know that most garage doors are at risk of a roll jam attack? Here we make a DIY garage door remote-control system that is much more secure than most commercial-ready products using the latest in ECC cryptography.

SparkFun SAMD21 Pro RF Hookup Guide

October 4, 2018

Using the super blazing, nay blinding, fast SAMD21 whipping clock cycles at 48MHz and the RFM96 module to connect to the Things Network (and other Radio woodles).

Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

2 Programming

Skill Level: Rookie - You will need a better fundamental understand of what code is, and how it works. You will be using beginner-level software and development tools like Arduino. You will be dealing directly with code, but numerous examples and libraries are available. Sensors or shields will communicate with serial or TTL.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

2 Electrical Prototyping

Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
See all skill levels


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