At the Feather M0’s heart is an ATSAMD21G18 ARM Cortex M0 processor, clocked at 48 MHz and at 3.3V logic, the same one used in the new Arduino Zero. This chip has a whopping 256K of FLASH (8x ...

The Feather STM32F405 Express is designed with versatility and ease of use in mind. The board supports a wide range of interfaces, including I2C, UART, GPIO, ADCs, and DACs, making it suitable for ...

There is also a 22-pin HSTX port. Adafruit is also planning a Metro RP2350 with pins for Arduino Shield and a MicroSD card reader. Adafruit Feather RP2350 with the new HSTX port (right).