Arduino ethernet is a microcontroller board based on the arduino uno and uses an integrated wiznet w5100 tcp ip ethernet controllerthe arduino ethernet is a microcontroller board based on the atmega328 it has 14 digital inputoutput pins 6 analog inputs a 16 mhz crystal oscillator a rj45 connection a power jack an icsp header and a reset buttonnb pins 10 11 12 and 13 are reserved for interfacing with the ethernet module and should not be used otherwise this reduces the number of a