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Amazon.com: HiLetgo W5100 Ethernet Network Shield W5100 Ethernet Expansion Board with SD Card Slot for Arduino UNO MEGA2560 : Electronics
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UNO Ethernet Shield Wiznet W5100 R3 Mega2560 1280 328 Extension Development Board FOR Arduino Micro SD Card Network Port Module - AliExpress
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arduino uno - Why doesn't the Ethernet W5100 shield work on Gigabit switch? - Arduino Stack Exchange
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W5200 ETHERNET SHIELD WIZNET - Expansion board | Ethernet,SPI; WIZnet W5200; W5200; W5200-ETH-SH | TME - Electronic components
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