I just bought one of these boards. I have the pdf of the manual but that doesn't tell me much about configuring the board. I'm new to Arduino and really have only used Raspberries as Linux or Kodi boxes.
Where do I begin with this board? I've been configuring Marlin 3D printer firmware for Arduino and controlling relays but have no idea how to use this board to access the I/O except the 40 pin GPIO.
Any pointers would be greatly appreciated.