Adafruit Feather 32u4 RFM69HCW 433 MHz

Overview

The Adafruit Feather 32u4 RFM69HCW 433 MHz is the 433 MHz variant of Adafruit's sub-GHz radio Feather, targeting the 433 MHz ISM band used widely in Europe, Asia, and other regions. It combines the ATmega32u4 at 8 MHz with the HopeRF RFM69HCW radio module based on the Semtech SX1231.

At 433 MHz, the radio achieves lower free-space path loss compared to 868/915 MHz, resulting in better penetration through walls and longer range. The RFM69HCW supports FSK and OOK modulation, AES-128 hardware encryption, and transmit power from +13 to +20 dBm (up to 100mW). A u.FL antenna connector allows attaching an optimized 433 MHz antenna.

The board shares all the same Feather features: 20 GPIO pins, 10 analog inputs, 7 PWM channels, hardware I2C/SPI/UART, native USB, and a built-in 100mA LiPo charger. The RadioHead library for Arduino makes it easy to build addressed packet networks, automatic acknowledgment, and reliable point-to-point or small mesh communication systems.

This variant is ideal for deployments in regions where 433 MHz is permitted for unlicensed ISM use, or for applications that benefit from the improved penetration characteristics of the lower frequency band.