Livebots is a project I'm working on which consists of an easy to use website for all the robots that people can interact with through the internet.
As an example I will be using a simple Arduino UNO with a LED connected to an Raspberry Pi to show you the concept, but of course you can use anything that can be receive messages by the serial port and any computer you would like.
Here is it:
And here is another example:
Step 1: Program the arduino
Feel free to adapt it to your own needs.