This website, bildr.org offers a great tutorial on how to set up a very simple led blink through the internet. using the R3 ethernet shield for the Arduino Uno, you can run some code by typing in the Arduino’s IP address in a browser. This explanation is extremely simplified, however. I will be using this resource as a stepping stone towards building a website interface that is able to interact with an Arduino.
Controlling pins over the internet with the Arduino Ethernet Shield. from Adam Meyer on Vimeo.