Adafruit Feather 32u4 RFM95 LoRa Radio - 868 or 915 MHz

The Adafruit Feather 32u4 RFM95 combines an ATmega32u4 microcontroller with an RFM9x LoRa radio for wireless communication at 868MHz or 915MHz. The radio frequency is configured in software. The ATmega32u4 runs at 8MHz with 3.3V logic and provides native USB for programming and serial communication.

The board includes a connector for a 3.7V LiPoly battery with built-in 100mA charging and can also be powered directly through Micro-USB. The RFM9x module communicates over SPI and provides software-selectable transmit power. A simple wire antenna can be soldered to the board, or an optional uFL connector can be fitted. The board comes fully assembled and tested.

Highlighted features

• RFM9x LoRa radio for 868MHz or 915MHz communication
• ATmega32u4 microcontroller with native USB
• 20 GPIO pins with hardware Serial, I2C and SPI
• Built-in LiPoly battery charger with charging status LED
• Battery voltage monitoring through an analog input
• Connection for a wire antenna or optional uFL connector
• Arduino libraries available for the RFM9x radio

Technical specifications

• Microcontroller: ATmega32u4 at 8MHz
• Logic level: 3.3V
• Flash memory: 32KB
• RAM: 2KB
• Radio: SX1276-based RFM9x LoRa module
• Radio frequency: 868MHz or 915MHz, software configurable
• Radio interface: SPI
• Transmit power: +5dBm to +20dBm, up to 100mW
• GPIO: 20
• PWM outputs: 7
• Analog inputs: 10
• LiPoly charging current: 100mA
• Dimensions: 51mm x 23mm x 8mm
• Weight: 5.5g