Many times you would have wished that you could take care of your dog remotely instead of letting a careless friend handle him. The answer to the problem is this ingenious twitter based feeding device by Nat Morris.
Theres a Nanode microcontroller (an Arduino clone with ENC28J60 ethernet), LCD screen from an old Dell laser printer, the stepper motor mechanism is out of a HP Deskjet 500 from the 90′s. The stepper is controlled via a ULN2003 and a 555 timer is used for the buzzer. Theres a pair of IP cameras (ones broke at the moment) and a server process which polls twitter and co-ordinates it all.
So how many more applications can you think of using the same concept?