Seeeduino XIAO

The Seeeduino XIAO is a tiny microcontroller board with powerful cpu SAMD21G18, ARM® Cortex®-M0+ 32bit 48MHz microcontroller with 256KB Flash,32KB SRAM.

Seeeduino XIAO has 14 GPIO PINs, which can be used for 11 digital interfaces, 11 mock interfaces, 10 PWM interfaces (d1-d10), 1 DAC output pin D0, 1 SWD pad interface, 1 I2C interface, 1 SPI interface, 1 UART interface, Serial communication indicator (T/R), Blink light (L). The colors of LEDs(Power,L,RX,TX) are green, yellow, blue and blue. Moreover, Seeeduino XIAO has a Type-C interface which can supply power and download code. There are two reset pad, you can short connect them to reset the board.

Pinout:

Install Seeeduino XIAO board to Arduino IDE

With Arduino IDE installed, 

- select menu File > Preference, 

- add Additional Boards Manager URLs with: 

https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json

- Tools-> Board-> Boards Manager...

- Search "Seeeduino XIAO"

- Install "Seeed SAMD Boards"

Product page: Seeed Wiki - Seeeduino XIAO

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Next:

- Program Seeeduino XIAO as USB-to-Serial bridge, to access HC-08 BLE 4.0 Module.

- Seeeduino XIAO display on OLED screen (with ssd1306 using I2C interface)