EtherMega Ethernet Arduino Compatible Microcontroller

freetronicsSKU: RB-Fee-02
Manufacturer #: ETHERMEGA

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  • 100% Arduino Mega 2560 compatible with onboard Ethernet
  • ATmega2560 MCU with onboard Wiznet-based ethernet
  • Digital I/O pins: 54 (14 provide PWM output)
  • Automatically updates twitter and serves web pages
  • Make sure the power select jumper is on the desired mode

The EtherMega Ethernet Arduino Compatible Microcontroller is an ultimate network-connected Arduino-compatible board combining an ATmega2560 MCU, onboard Wiznet-based Ethernet, an ATmega16u2 USB-serial converter, a microSD card slot, and Power-over-Ethernet support, and even an onboard switchmode voltage regulator so it can run on up to 28V without overheating. The EtherMega is a 100% Arduino Mega 2560 compatible board that can talk to the world. Does Twitter updates automatically, serves web pages, connects to web services, displays sensor data online and controls devices using a web browser. The EtherMega uses the same ATmega2560 as the Arduino Mega 2560 so it has masses of RAM, flash memory, and I/O pins, and also includes the same Wiznet W5100 chip used by the official Arduino Ethernet Shield, so it's 100% compatible with the Ethernet library and sketches.

EtherMega Ethernet Arduino Compatible Microcontroller

A micro SD card slot has been added so you can store web content on the card, or log data to it. It gets even better with space to squeeze in a small prototyping area, so now it's possible to build a complete, Internet-enabled Arduino device including your own custom parts all on a single board. You don't even need to use a prototyping shield for many projects.

EtherMega Ethernet Arduino Compatible Microcontroller



  • Gold-plated PCB
  • Top and bottom parts overlays
  • Powerful and versatile ATmega2560 MCU
  • Switchmode voltage regulator for wide input voltage range
  • D13 pin isolated with a MOSFET so you can use it as an input
  • Optional Power-over-Ethernet support, both cheapie DIY or full 8023af standards-compliant
  • Ethernet activity indicators on both the PCB and the jack
  • 10/100base-T auto-selection
  • Fully compatible with standard Ethernet library
  • Reset management chip
  • Fixed SPI behavior on Ethernet chipset
  • Robust power filtering
  • Sexy rounded corners

PDF Files


  • MCU type: Atmel ATmega2560
  • Operating voltage: 5V
  • MCU clock speed: 16 MHz


  • Input voltage: 7-28V DC (onboard switchmode power supply)
  • Analog input pins: 16
  • Current per I/O pin: 40 mA maximum
  • Total current for all I/O pins: 200mA maximum
  • Current at 3.3V: 50mA maximum

Customer Reviews

Based on 5 reviews
6 months running at sub freezing temperatures with no hiccups

Great product. When you have sensor that needs to be deployed remotely for an extended period of time, the amount of code required is astonishing. Watchdog timers, out of memory/memory fragmentation prevention, encryption, over the air updates, etc... Normal Arduinos just can't handle it. Upgrading to an Atmel ATmega2560 is a requirement if you don't want to make the jump to more advanced platforms such as mbed or keil. The problem is that there really aren't many non-wifi solutions for the 2560. Especially given that many of the Arduino Mega Sheilds have all sorts of problems with power usage. This product is one of those rare solutions and it works great. We have ~12 devices out in the field. Most of them are in enclosures 30ft+ off the ground and are being run off of POE setup. Some are connected to a switch on fiber. Others on normal cellular modems with a power injector. I hope they keep producing them as I will be likely purchasing another 100 units over the course of next year.

Great product

I have always been astonished by the innovation of Freetronics in relation to this and other products. It is a great board combining the power of the Arduino Mega with the ethernet connectivity. And thanks to RobotShop we got it in good quantities for a great price.

Good Product - Reasonable Price

Yes please! This is a great product, wonderful combination of the MEGA and the Ethernet board. Seems pretty stable so far. Everyone please buy one so they keep making them!

Great product for automation

More dependable than wifi controllers and one less part to worry about breaking down without having to have the ehternet shield. Check out the maker of this product on his you tube channel called SuperHouse

Great Product

Fast shipping. Easy to use. Highly recommend

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