I have a question that might be a #noob question but I am wondering if there is a board similar to the nodemcu in size that runs arduino code but instead can use ethernet to connect to the network instead of the wifi? I have already seen the connections to use one of the pins and such to connect that way but I am looking to see if there is a board that has the rj45 connection on it already.

  • closest I found is MKR Zero with MKR ETH shield
    – Juraj
    Commented Aug 19, 2018 at 19:12
  • while I can't categorically rule it out, I've never seen such a device after hundreds of hours shopping different sites and buying about 15 different models of ESP boards over 2 years...
    – dandavis
    Commented Aug 19, 2018 at 19:30

2 Answers 2


I don't think you'll find a single off-the-shelf product. The closest I have managed to come to it is a Teensy 3.2 plus a WIZ820io & Micro SD Card Adaptor and a WIZ850io module, all stacked together. Footprint-wise it's around the same as (or smaller than) many ESP8266-based boards - however it's considerably chunkier when all combined:

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  • Awesome. Thanks all of these are great staring places for me. Thanks so much
    – nmmooners
    Commented Aug 20, 2018 at 22:59
  • "it's considerably chunkier". it is only the RJ-45 connector.
    – Juraj
    Commented Aug 21, 2018 at 4:48

Yes one does exist that I know of. It's called the EtherTen and is made by an Australian company called Freetronics.


It uses the ATMega328P microcontroller that is used on the Arduino Uno. It is 100% Arduino compatible with onboard (RJ45 wired) Ethernet.

It can be purchased from Freetronics.com.au or from Roboshop.com.

Freetronics provides a number of documents and resources on the page linked above.

  • this is Arduino Ethernet clone. how is this similar to NodeMCU? it is not 32bit and is large.
    – Juraj
    Commented Aug 20, 2018 at 4:50
  • The requirement was that it runs Arduino code. There was no requirement that it had to be 32-bit nor be compatible with NodeMCU (except for size).
    – sa_leinad
    Commented Aug 21, 2018 at 2:06

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