Adafruit Feather 32u4 433MHz RFM69HCW Packet Radio

Adafruit Feather 32u4 433MHz RFM69HCW Packet Radio is a microcontroller packet radio transceiver with built-in USB and battery charging. The device integrates an Adafruit Feather 32u4 in a 433MHz radio module. Designers can use this 433MHz frequency module version for either 868MHz or 915MHz transmission and reception.

The 32u4 433MHz RFM69HCW Packet Radio supports wireless networks that extend past 2.4GHz 802.15.4. The packet radio is also more flexible than Bluetooth LE and without the high-power requirements of WiFi.

The design is based on the ATmega32u4 processor, clocked at 8MHz and at 3.3V logic. The chip offers 32K of flash and 2K of RAM. The built-in USB provides 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.


  • Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in
  • Weight 5.5grams
  • 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
  • 20 GPIO pins
  • Hardware Serial, hardware I²C, hardware SPI support
  • 8 PWM pins
  • 10 analog inputs
  • Built-in 100mA lithium polymer charger with charging status indicator LED
  • Pin #13 red LED for general purpose blinking
  • Power/enable pin
  • 4 mounting holes
  • Reset button
  • RFM69HCW 433MHz Radio Module Features
    • SX1231-based module with SPI interface
    • Packet radio with ready-to-go library
    • Uses the amateur or license-free ISM band (ITU "Europe" license-free ISM or ITU "American" amateur with limitations)
    • +13 to +20dBm up to 100mW Power Output Capability (selectable in software)
    • Range of approx. 350 meters, depending on obstructions, frequency, antenna and power output
    • Create multi-point networks with individual node addresses
    • Encrypted packet engine with AES-128
    • Simple wire antenna or spot for uFL connector

Feather 32u4 433MHz RFM69HCW Packet Radio

Adafruit Feather 32u4 433MHz RFM69HCW Packet Radio
Published: 2017-01-20 | Updated: 2022-03-10