Seeeduino XIAO Microcontroller SAMD21 Cortex M0+ Compatible with Arduino IDE Development Board
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I like the small form factor, features, speed, memory size and the on-board D/A. One issue is that the upload to the board was not streamlined and reliable - until I realized that I need to reset the board, to put it into the bootloader mode prior to uploading the code using the Arduino or Platform I/O IDEs. The other issue is that the part needs USB-C connector, which I didn't have, so had to order separately. Otherwise, I like this part !
WOW It's very powerfull small IOT board. I think it is betterr than arduino. The memory a bitt weak but may the next gen.... All ports are digital ans analog, has tx,rx for serial communication like GPS module or Bluetooth.