Seeed Studio Seeeduino Lotus Cortex-M0+ - SAMD21

The Seeeduino Lotus Cortex-M0+ is a microcontroller based on a SAMD21 chipset with the pin layout of an Arduino Uno, making the board compatible with shields for the Arduino Uno. In addition, the board also has een Li-ion/Li-Po battery charging circuit and 12 Grove connectors (I2C/UART/GPIO) to easily connect other modules.

See the following page for more information: Seeeduino Lotus Cortex-M0+