Adafruit Feather 32u4 900MHz RFM69HCW Packet Radio

Adafruit Feather 32u4 900MHz RFM69HCW Packet Radio is a microcontroller packet radio transceiver with built-in USB and battery charging. The device integrates Adafruit Feather 32u4 in a 900MHz radio module. Designers can use this 900MHz frequency module version for either 868MHz or 915MHz transmission and reception.

The 32u4 900MHz RFM69HCW Packet Radio supports wireless networks that extend past 2.4GHz 802.15.4. The packet radio is more flexible than Bluetooth LE without the high-power requirements of WiFi.

The design is based on the ATmega32u4 processor, which is clocked at 8MHz and at 3.3V logic. The packet radio's chip offers 32K of flash and 2K of RAM. The built-in USB provides a USB-to-Serial program and debug capability. To support portable projects, the development board includes a connector for Adafruit 3.7V lithium polymer batteries and built-in battery charging.


  • Feather 32u4 Features
    • Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in
    • Weight 5.5 grams
    • ATmega32u4 @ 8MHz with 3.3V logic/power
    • 3.3V regulator with 500mA peak current output
    • USB native support comes with a USB bootloader and serial port debugging
    • 20 GPIO pins
    • Hardware Serial, hardware I2C, hardware SPI support
    • 8 PWM pins
    • 10 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
  • Feather 32u4 Radio Features
    • SX1231 based module with SPI interface
    • Packet radio with ready-to-go Arduino libraries
    • Uses the license-free ISM band ("European ISM" @ 868MHz or "American ISM" @ 915MHz)
    • +13 to +20dBm up to 100mW Power Output Capability (power output selectable in software)
    • 50mA (+13dBm) to 150mA (+20dBm) current draw for transmissions
    • Range of approx. 350 meters, depending on obstructions, frequency, antenna, and power output
    • Create multipoint networks with individual node addresses
    • Encrypted packet engine with AES-128
    • Simple wire antenna or spot for uFL connector

Feather 32u4 900MHz RFM69HCW Packet Radio

Adafruit Feather 32u4 900MHz RFM69HCW Packet Radio
Published: 2016-12-19 | Updated: 2022-03-11