The reason why there are fewer Grove connectors in the latest version is that we are trying to avoid confusion caused by the reuse of GPIOs.
SeeeduinoXIAO has led out 14 GPIOs including 3.3V/5V and GND. Other 11 GPIOs will be used as:
- Grove A0: 0
- 5V Servo: 1
- Button: 3
- Grove IIC: 4 5
- Grove UART: 6 7
- SPI Flash / SD card: 2 8 9 10
The add-on SD card would be able to expand memory for Python and the library, just as the same function of SPI-flash and larger memory space.
SAMD21 MCU already include an RTC but Seeeduino XIAO did not lead out the required pin for it, so it may be more practical to just add another RTC chip on board.
For the more number of Grove IIC you are expected, we didn’t put two of it only because of the space concern, and Grove IIC Hub would be able to fix the problem if more IIC devices are needed, so we keep only one on board.
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