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Adafruit Feather M0 RFM69HCW Packet Radio - 433MHz
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The Feather M0 RFM69HCW Packet Radio (433 MHz) combines the ATSAMD21G18 ARM Cortex M0+ processor with an SX1231-based RFM69HCW radio transceiver for wireless...
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The Feather M0 RFM69HCW Packet Radio (433 MHz) combines the ATSAMD21G18 ARM Cortex M0+ processor with an SX1231-based RFM69HCW radio transceiver for wireless data communication at 433 MHz. It includes built-in USB, LiPo battery charging, and the full Feather M0 pin set in a compact, portable form factor.
The RFM69HCW radio is ideal for small data packet transmission where you need greater range than 2.4 GHz technologies like Bluetooth, Wi-Fi, or ZigBee. With up to 100 mW output power, AES-128 encryption, and multipoint networking support, it suits a wide range of wireless sensor and control applications.
Key Features
- ATSAMD21G18 Processor – ARM Cortex M0+ running at 48 MHz, 3.3V logic
- 256 KB Flash + 32 KB RAM – 8× more flash and 16× more RAM than ATmega328/32u4
- RFM69HCW 433 MHz Radio – SX1231-based packet radio with SPI interface
- +13 to +20 dBm Output – Up to 100 mW transmit power, selectable in software
- ~350 m Range – Depending on obstructions, antenna, and power settings
- AES-128 Encryption – Hardware-accelerated encrypted packet engine
- Multipoint Networking – Individual node addresses for creating wireless networks
- Native USB – Built-in USB-to-Serial for programming and debugging, no FTDI chip needed
- 20 GPIO Pins – Hardware Serial, I2C, and SPI; 8× PWM, 10× analogue inputs, 1× analogue output
- LiPo Battery Support – JST connector with built-in 100 mA charger, battery voltage monitoring via analogue pin
- Compact Design – 51 mm × 23 mm × 8 mm, weighing 5.8 g
Also Available
- Feather M0 RFM69HCW 868/915 MHz – Same radio at 868/915 MHz
- Feather M0 RFM95 LoRa 900 MHz – Long-range LoRa radio
- Feather M0 RFM96 LoRa 433 MHz – Long-range LoRa at 433 MHz
- Feather M0 Express – CircuitPython with 2 MB flash
- Feather M0 Basic Proto – Prototyping area
- Feather M0 Adalogger – MicroSD data logging
- Feather M0 Bluefruit LE – Bluetooth Low Energy
- Feather M0 WiFi – ATWINC1500 Wi-Fi
Ideal For
- Wireless sensor networks and remote monitoring
- Battery-powered radio telemetry
- Point-to-point and multipoint data links
- IoT projects requiring sub-GHz range
Package Contents
- 1× Feather M0 RFM69HCW 433 MHz
- 1× Header pin set
Note: A wire antenna must be soldered to the board (any solid or stranded core wire will work). LiPo battery and USB cable sold separately.
Jargon buster
Plain-language definitions for the technical terms used above.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- GPIO
- General-purpose input/output pins are microcontroller pins you can set in software to read signals, switch devices on and off, or connect to peripherals. The number of GPIO pins matters because it limits how many buttons, LEDs, sensors, and other parts you can wire directly to the board.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- LiPo
- A lithium polymer rechargeable battery commonly used in portable electronics projects. It matters because LiPo batteries need correct charging circuitry and care, and this board includes hardware intended for that battery type.
- LoRa
- LoRa is a long-range, low-power radio technology often used for telemetry and remote sensors. It matters here because the connector and pinout are compatible with some LoRa telemetry products, even though this module uses Bluetooth instead.
- native USB
- Native USB means the microcontroller itself handles USB communication, rather than using a separate USB-to-serial chip. This matters for programming, debugging, and projects that need the board to act directly as a USB device.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- RAM
- RAM is temporary memory used while a device is running, and its contents are lost when power is removed. A “Run in RAM” mode is useful for testing settings without permanently programming the module, but it may not support every feature.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
- Zigbee
- A low-power wireless standard commonly used by smart home sensors, switches, and lights. It matters if you want the board to communicate with Zigbee devices or act as part of a home automation network.
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