Adafruit Feather M0 RFM69HCW Packet Radio (868/915 MHz)
ATSAMD21G18 ARM Cortex-M0+ Feather board with RFM69HCW sub-GHz radio at 868/915 MHz. Up to +20 dBm TX power, AES-128 encryption, 256KB flash, 32KB RAM, native USB, and built-in LiPo charger.
$29.95
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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 M0 RFM69HCW 868/915 MHz combines the ATSAMD21G18 ARM Cortex-M0+ microcontroller running at 48 MHz with the HopeRF RFM69HCW sub-GHz radio module. Designed for the 868 MHz (Europe) and 915 MHz (North America) ISM bands, this Feather form-factor board makes it straightforward to add reliable long-range packet radio to battery-powered projects.
The ATSAMD21G18 provides 256KB of flash and 32KB of SRAM — significantly more than ATmega-based alternatives — along with native USB support for programming and serial communication. The RFM69HCW radio module, based on the Semtech SX1231, supports FSK and OOK modulation with hardware AES-128 encryption and transmit power adjustable from +13 to +20 dBm. A u.FL connector accepts an external antenna for optimized range.
All standard Feather peripherals are present: 20 GPIO pins, 6 analog inputs, one DAC output, 8 PWM channels, and hardware I2C, SPI, and UART. A JST connector and built-in 100mA LiPo charger make it easy to run from a rechargeable battery, while the USB port charges the battery when connected. The onboard LED on D13 doubles as a status indicator.
The RadioHead library provides a straightforward API for addressed packet communication with acknowledgment and retries. Compatible with both the Arduino IDE and PlatformIO, this board is well suited for sensor networks, remote telemetry, and any application requiring dependable sub-GHz wireless links.
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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