“Looking for a powerful microcontroller as an alternative to the Arduino? Why not consider the ATSAMD21 which can be programmed by the Arduino IDE?
The Atmel’s ATSAMD21 is a low-power, high-performance Microchip’s ARM® Cortex®-M0+ based flash microcontroller. Here are its features:
256KB of flash and 32KB of SRAM
48MHz Operating Frequency
Full Speed USB device and embedded host
Support for up to 120 touch channels
1.62V to 3.63V power supply
Six serial communication modules (SERCOM) configurable as UART/USART, SPI or I2C, three 16-bit timer/counters, 32-bit Real-Time Clock and calendar, 20 PWM channels, one 14-channel 12-bit ADC, one 10-bit DAC
As you can see this is a very powerful microcontroller compared to the older 8-bit/16MHz Arduino microcontrollers.”