Feather 32u4 LoRa

This is the  Feather 32u4 LoRa Radio (RFM9x). Microcontroller with a "Long Range (LoRa)" packet radio transceiver with built in USB and battery charging. Its an  Feather 32u4 with a 868 MHz radio module cooked in! Great for making wireless networks that can go further than 2.4GHz 802.15.4 and similar, are more flexible than Bluetooth LE and without the high power requirements of WiFi.

Feather is the new development board and like its namesake it is thin, light, and lets you fly! Feather is designed to be a new standard for portable microcontroller cores. We have other boards in the Feather family, check'em out here.

At the Feather 32u4's heart is at ATmega32u4 clocked at 8 MHz and at 3.3V logic, a chip setup we've had tons of experience with as it's the same as the Flora. This chip has 32K of flash and 2K of RAM, with built in USB so not only does it have a USB-to-Serial program & debug capability built in with no need for an FTDI-like chip, it can also act like a mouse, keyboard, USB MIDI device, etc.

To make it easy to use for portable projects, there is a connector for any of our 3.7V Lithium polymer batteries and built in battery charging. You don't need a battery, it will run just fine straight from the micro USB connector. But, if you do have a battery, you can take it on the go, then plug in the USB to recharge. The Feather will automatically switch over to USB power when its available. We also tied the battery thru a divider to an analog pin, so you can measure and monitor the battery voltage to detect when you need a recharge.

Here's some handy specs! Like all Feather 32u4's you get:

    Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in
    Light as a (large?) feather - 5.5 grams
    ATmega32u4 @ 8MHz with 3.3V logic/power
    3.3V regulator with 500mA peak current output
    USB native support, comes with USB bootloader and serial port debugging
    You also get tons of pins - 20 GPIO pins
    Hardware Serial, hardware I2C, hardware SPI support
    7 x PWM pins
    10 x analog inputs
    Built in 100mA lipoly charger with charging status indicator LED
    Pin #13 red LED for general purpose blinking
    Power/enable pin
    4 mounting holes
    Reset button

This Feather 32u4 LoRa Radio uses the extra space left over to add an RFM9x LoRa 868 MHz radio module. These radios are not good for transmitting audio or video, but they do work quite well for small data packet transmission when you need more range than 2.4 GHz (BT, BLE, WiFi, ZigBee).

    SX1276 LoRa® based module with SPI interface
    Packet radio with ready-to-go Arduino libraries
    Uses the license-free ISM bands (ITU "Europe" @ 868MHz)
    +5 to +20 dBm up to 100 mW Power Output Capability (power output selectable in software)
    ~300uA during full sleep, ~120mA peak during +20dBm transmit, ~40mA during active radio listening.
    Simple wire antenna or spot for uFL connector

Tests with default library settings: over 1.2mi/2Km line-of-sight with wire quarter-wave antennas. (With setting tweaking and directional antennas, 20Km is possible).

Comes fully assembled and tested, with a USB bootloader that lets you quickly use it with the Arduino IDE.
Technical Details

    EagleCAD PCB files, Fritzing object, datasheets and more in the tutorial
    51mm x 23mm x 8mm / 2.0" x 0.9" x 0.28"
    Weight: 5.5g