This project uses an Arduino with an Ethernet shield to obtain the external IP address of your Internet connection. It checks the address periodically and if it changes, an email will be sent via SMTP, indicating the new IP address. An LCD is also attached to the Arduino that displays the external IP.
His project was done because the authors father had purchased a video camera system for some property he has in a rural area. He wants to monitor the video remotely, but the external IP address changes frequently as he uses DSL service He also considered to use DDNS service, but it requires client running on a PC all the time. He decided to build this system to solve all the difficulties.
If you visit Hack a Day site, you can view how this system works, and get the source code from GitHub
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