Adafruit Feather 32u4 RFM69HCW 868/915 MHz
ATmega32u4 Feather board with RFM69HCW sub-GHz radio supporting 868/915 MHz with up to +20 dBm transmit power, AES-128 encryption, and 100mA LiPo charger for long-range IoT sensor networks.
$24.95
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Specifications
Components
HopeRF RFM69HCW 868/915MHz radio module based on SX1231, +13 to +20 dBm TX, AES-128, FSK/OOK modulation.
Bus Interfaces
GPIO Map
Overview
The Adafruit Feather 32u4 RFM69HCW (868/915 MHz) combines the ATmega32u4 microcontroller with HopeRF's RFM69HCW radio module — a versatile sub-GHz transceiver based on the Semtech SX1231. The radio operates in the 868 MHz (Europe) or 915 MHz (Americas) ISM bands and can transmit at up to +20 dBm (100mW), achieving a range of approximately 350 meters in open space.
The RFM69HCW supports AES-128 hardware encryption and is ideal for building private wireless sensor networks without a LoRaWAN gateway. It uses a simple packet-based protocol that Adafruit's RadioHead library makes easy to work with, supporting addressed packets, automatic acknowledgment, and mesh-style routing.
Power management follows the Feather standard: a JST connector accepts a 3.7V LiPo battery, and a built-in 100mA charger keeps it topped up via the Micro-USB port. The 3.3V regulator provides 500mA for peripherals. An onboard u.FL connector allows attaching an external antenna for extended range beyond the included wire stub.
With 20 GPIO pins, 10 analog inputs, 7 PWM outputs, and hardware Serial/I2C/SPI, this board is a capable platform for remote sensor nodes, weather stations, and any point-to-point or small mesh network needing reliable sub-GHz communication.
Use Cases
5IoT
Internet of Things applications including connected sensors, actuators, and smart devices that communicate over WiFi, BLE, LoRa, or other wireless protocols.
Long-Range Sensor Network
Distributed sensor networks covering large areas using LoRa or cellular connectivity.
Remote Sensor Nodes
Deploy wireless sensor nodes in remote locations using LoRa, NB-IoT, or cellular connectivity.
Sub-GHz Communication
Wireless communication using sub-GHz frequencies (433/868/915 MHz) for long range and wall penetration.
Prototyping
Rapid hardware prototyping and proof-of-concept development with breadboard-friendly form factors and accessible development environments.
Resources
Where to Buy
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