Seeed Studio XIAO SAMD21 is a minimal, low-cost board that uses the Atmel ATSAMD21G18, a powerful 32-bit ARM Cortex®-M0+ processor running at 48MHz with 256 KB Flash and 32 KB SRAM. The board is 20 mm x 17.5 mm in size which is perfect for wearable devices and small projects. It has multiple inte...