UNO Shield Ethernet Shield W5100 R3 UNO Mega 2560 1280 328 UNR R3 < only W5100 Development boar UNO Shield Ethernet Shield W5100 R3 UNO Mega 2560 1280 328 UNR R3 < only W5100 Development board UNO Shield Ethernet Shield W5100 R3 UNO Mega 2560 1280 328 UNR R3 < only W5100 Development board Polybag