Leonardo ETH Controller Board
The Arduino Leonardo ETH is the Leonardo with a built-in ethernet controller (Wiznet 5500 controller with RJ45 connector). Optional PoE (Power over Ethernet)
The Leonardo ETH is a microcontroller board based on the ATmega32U4 and the W5500 TCP/IP Embedded Ethernet Controller has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16MHz crystal oscillator, an RJ45 connection, a micro USB connector, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. The Leonardo ETH differs from the preceding Ethernet board in that the ATmega32u4 has built-in USB communication, eliminating the need for an external USB-to-serial converter.