Australian enthusiast Beau Walker has created an functional and interesting aquaponics pump controller based on a Freetronics EtherTen and a home-made shield. The system allows control of two water pumps plus temperature monitoring via DS18B20 sensors all via a simple website. Furthermore the microSD card socket is used to log data and store settings for the system. With careful monitoring and care - the results have been quite successful, for example:
This is a great project that shows real-world applications for the Arduino platform. Visit the interesting website for more information. And for more, we're on twitter and Google+, so follow us for news and product updates as well.
... or for more program space, I/O ports consider the Freetronics EtherMega - the Arduino Mega2560-compatible with onboard Ethernet, microSD socket and optional PoE: