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By Sheepdog
#131458
I've used one of the "new" Arduino Ethernet Shields (W5100 based, Sparkfun product DEV-09026) plus an Arduino Uno to put a server online. It has buttons to turn an LED on my Arduino on and off across the 'net, and a light sensor "watching" the LED, so you can see whether it reacts. (The light sensor's reading appears on the page served.)

It is at...

http://mon277rr.dyndns.org:81/

... and there's a link there to a page from which you can get to the full sourcecode.