For a comparison with previous versions see the index of arduino boards. The uno is the latest in a series of usb arduino boards and the reference model for the arduino platform.
Differences Between The Arduino Uno Revision 2 And Revision 3
Wifi Board Nanoesp Bzw Pretzel Board Fur
Arduino Uno R3 Stromlaufplan Pcb Analyse Erklarung
Schaltplan Und Arduino Sketch Fur Selbstgebauten Midi Controller
