Adafruit Feather M0 WiFi with uFL - ATSAMD21 + ATWINC1500

Feather M0 WiFi by Adafruit is a compact, lightweight development board similar to a feather, focusing on being a versatile standard for portable microcontroller cores.

The board integrates the reliable ATWINC1500 WiFi module, enhancing networking capabilities with built-in USB and battery charging, making it an ideal choice for Arduino-compatible projects.

Specifications include a fast ATSAMD21G18 ARM Cortex M0 processor clocked at 48 MHz, with 256KB of FLASH and 32KB of RAM, providing ample space for complex code.

The board supports multiple interfaces: 20 GPIO pins, hardware Serial, I2C, SPI, 8 PWM pins, and 10 analog inputs. It is compatible with 802.11 b/g/n networks, supporting WEP, WPA, and WPA2 encryption.

Additional features include built-in 200mA LiPo charger, USB bootloader, and serial port debugging. Connect via a micro USB or attach a 3.7V LiPo battery for portability, automatically switching to USB power when available.

For advanced users, the SWDIO/SWCLK pins are accessible for debugging with Atmel Studio. The board requires an external uFL connector antenna for WiFi, offering flexibility in antenna choices.

Please note the absence of CircuitPython/MicroPython drivers for the WINC1500. The Feather M0 is perfect for DIY projects, integrating network features into compact designs, and maintaining energy efficiency.