Potted plant watering system. (Involves water pumps.)

Using Arduino Project Guidance
84

Probably late to the party here and somewhat irrelevant unless you can get the code working but I happened to run across this on ebay while I was looking for cheap arduinos. Perhaps it could be useful to you.

http://www.ebay.com/itm/Moisture-Sensor-For-Arduino-urban-garden-tool-Arduino-Compatible-/150845999918?pt=LH_DefaultDomain_0&hash=item231f1f4b2e