The Adafruit Feather 32u4 LoRa Radio (RFM9x) combines an ATmega32u4 microcontroller with a 433MHz LoRa radio, built-in USB and LiPo battery charging for long-range wireless projects.
The AdafruitFeather 32u4 LoRa Radio (RFM9x) combines an ATmega32u4 microcontroller with a built-in 433MHz LoRa radio, making it easy to add long-range wireless communication to portable projects.
The board runs at 8MHz with 3.3V logic and includes 32KB of Flash, 2KB of RAM and native USB support. This allows you to program and debug the board directly over USB without needing a separate USB-to-serial adapter. It can also act as a USB keyboard, mouse or MIDI device.
For portable projects, the Feather includes a connector for a 3.7V LiPo battery and built-in battery charging. A battery isn't required, as the board can run directly from its Micro USB connection. When both are connected, the board automatically switches to USB power and charges the battery. Battery voltage can also be monitored through an analogue pin.
433MHz LoRa Radio
The built-in RFM9x 433MHz LoRa module is designed for sending small amounts of data over longer distances than typical 2.4GHz wireless technologies such as WiFi and Bluetooth.
SX1276-based LoRa module
433MHz radio frequency
SPI interface
Arduino library support
Adjustable output power from +5 to +20dBm
Up to 100mW output power
Around 300µA in full sleep
Around 120mA peak at +20dBm transmission
Around 40mA during active radio listening
Supports a simple wire antenna or optional uFL connector
With suitable antennas and settings, LoRa can provide long-range communication while keeping power consumption relatively low.
The board comes fully assembled and tested with a USB bootloader for use with the Arduino IDE. Headers are included and can be soldered to the board for use with a solderless breadboard.
A suitable 433MHz antenna is required. A simple wire antenna can be made by cutting and soldering a suitable length of wire to the antenna connection.
LiPo battery, USB cable and antenna are not included.
Features
ATmega32u4 microcontroller @ 8MHz
3.3V logic and power
32KB Flash and 2KB RAM
Built-in native USB support
20 GPIO pins
Hardware Serial, I2C and SPI
7 PWM pins
10 analogue inputs
3.3V regulator with up to 500mA peak output
Built-in 100mA LiPo battery charger with status LED
User-controllable red LED on pin 13
Power/enable pin
Reset button
4 mounting holes
Specifications
Dimensions: 51 x 23 x 8mm without headers
Weight: 5.5g
Revision History
As of November 27, 2023 we've updated this PCB with Adafruit Pinguin to make a lovely and legible silkscreen
As of August 5, 2020 we are selling a version of this breakout that has a protective metal tin on the radio module! The breakout is otherwise the same.
