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Help in understanding the Arduino Ethernet Shield

Former Member

Hi,

 

I am new to programming and my parents just got me an arduino uno R3 with the arduino ethernet shield to play around with.

I've played around with some of the basic codes, and I have done some research and grasped some information about networking. I connected my host computer and my arduino via a switch (TRENDnet TEG S80G Switch ‑ 8 ports). Using my computer and CMD prompt, I can ping the arduino board. From what I keep reading is that the ethernet shield allows you to connect your arduino to your host through the internet by using the ethernet library, but I am wondering if there is there a way to communicate the arduino with my host computer via ethernet without using the internet? In other words, I want it to act somewhat like the serial communication, but instead I want to send information through the ethernet cable and not the usb port (I will still be using the usb to upload the code, but wouldn't want to use it after).

Would that be possible, or must it be connected to the internet for the ethernet capabilities to function?

 

Thanks for all the help in advance. image

  • 0

    For most uses you don't need to be connected to the internet, there are however lots of examples that do utilise 3rd party APIs hosted on the internet. The reason for that is that you can post data to the service and then it can be read any time, it's easier to configure the solution that way to avoid problems with firewalls etc.

     

    There was a talk last week by Christian Bianchini at the London Arduino meetup about using the Ethernet shield, he used a local network to pass messages backwards and forwards and to turn an LED on and off. You can listen to his talk and access the code on the following page.

     

    http://londuino.com/london-arduino-event-4/

     

    You should also find that there are a selection of examples that use the Ethernet shield on the menu of the Arduino software.

  • 0

    hi,

     

    Checkout the Ethernet Samples in the Reference section Arduino -> Reference -> Libraries -> Ethernet.

     

    You need to program the Arduino by uploading Ethernet sample example or write your own. The samples allows to set IP address and then ping them.

    Try  the Chatserver example.

     

    Then from your software on the PC, you can communicate with the Arduino using the ethernet shield.

     

    cheers

    Sid