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

In addition to the timer settings there is a manual watering switch as well. He used a typical mains light switch, wiring it with a pull-down resistor to make it work well with the Arduino.

Watering plants is tough to remember. You'll find all types of tricks out there to do it automatically, but Instructables user randofo's Arduino-powered system might be one of the more ambitious.

Their are several sensors in the system that measure water flow, tank level, water quality and dissolved oxygen. An Arduino monitors these sensors and reports the information back to a $20 router ...

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Green infrastructure (French drains, rain gardens, permeable pavement) goes well beyond watering systems. But Eness says this gateway to green infrastructure is low-cost and low-tech.