There is a system called Aquaponics that attempts to control those variables. Aquaponics combines aquaculture (raising aquatic animals) with hydroponics (growing plants in water).

The Arduino Plant Watering System is designed to automatically supply water to your plant's soil once its moisture level falls below a particular point.

The device also keeps track of temperature and humidity. The entire system can be controlled via a web interface. The Arduino serves a web page that allows the user full control over the alarm.

It may not use water recycled from your air conditioner, but this compact self-watering solution is perfect for any size garden. It's extremely simple, too (apart from the Arduino, perhaps), and ...

The small arm mounted propeller units are capable of propelling a skin diver through the water with minimal effort and have been created by PeterSripol who built the wrist worn propellers for a ...

To descend, the water would be diverted from the waterwheel, allowing it to free wheel in reverse, throttled by a motorcycle brake. The entire system was controlled by an Arduino and powered by a mini ...