Although it is relatively simple to broadcast information from your Arduino board to the Internet, the resulting broadcast is either public via twitter or the connection can difficult to setup due to needing a static IP address. Thus this new method described by Clement Storck is refreshingly easy and quite usable. Their method uses the "PushingBox" cloud-based notification system, which can send an email, SMS or tweet. In this example, when the doorbell is pressed, the Arduino triggers PushingBox which requests an image from an Internet-connected IP camera aimed at the door. Then the user receives a photo of who's at the door. For example:
Want to get started with your own system? Our Freetronics EtherTen is the perfect board for enabling your PushingBox projects. Apart from being fully Arduino Uno-compatible, it has onboard Ethernet, microSD socket, full USB interface (so you don't need a costly FTDI cable just to upload a sketch!) and supports optional Power-over-Ethernet.