Arduino Uno Ethernet
Arduino UNO with built-in Ethernet and microSD slot based on the ATmega328P at 16 MHz — a self-contained board for networked Arduino projects without needing a separate Ethernet shield.
$65.00
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Specifications
Components
8-bit AVR microcontroller at 16 MHz with 32KB flash, 2KB SRAM
Wiznet W5100 hardwired TCP/IP embedded Ethernet controller with 10/100 Ethernet support
Bus Interfaces
GPIO Map
Overview
The Arduino Uno Ethernet integrates an Ethernet jack and microSD card slot directly onto an Arduino UNO-compatible board, eliminating the need for a separate Ethernet shield. Based on the ATmega328P microcontroller at 16 MHz, it provides the familiar Arduino pin layout while adding always-present network connectivity with visual status indicator LEDs.
The board omits a USB port in favor of a 6-pin FTDI connector for programming, requiring an FTDI cable or FTDI Friend for uploading sketches. Digital pins 10–13 are reserved for the onboard Ethernet chip, and pin 4 is used for the microSD card chip select, leaving the remaining pins available for user code.
Power is delivered through the standard Arduino barrel jack, and the board maintains the R3 shield footprint with some caveats — the taller Ethernet jack may require stacking headers when using shields. The integrated microSD slot enables local data logging alongside network operations.
Designed for IoT and networked embedded applications, this board simplifies deployments where Ethernet connectivity is required without the bulk and pin overhead of stacking a separate shield.
Use Cases
4IoT
Internet of Things applications including connected sensors, actuators, and smart devices that communicate over WiFi, BLE, LoRa, or other wireless protocols.
networking
Data Logging
Recording time-stamped sensor readings, environmental data, or system events to local storage.
home-automation
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