Have you seen the robot vacuum cleaners that use sensors to vacuum your living room? Well, this idea's in the same vain, except the robot is attached to your ceiling and waters your plants.
Attach the plant watering robot to your ceiling in it's starting place or "home." Note: The robot uses suction
cup feet to move across the ceiling. Then use voice commands to give the robot directions to your plants, "straight, right, right, stop." The robot is autonomous and will store your directions in memory so that it can repeat the path when you are not there.
When the robot is directly above a plant you say, "Water Plant." The Robot scans the area below and identifies the round, square, (etc) shaped planter container, and makes small adjusts so that when the water is released, it falls directly into the plant's container. The water dispenses for about 5 seconds. If this particular plant needs more water, you say, "More Water." The robot continues watering and will remember that a longer watering period was required for this particular plant.
Continue guiding the robot around your home, indicating where your plants are located and how long each plant should be watered. Then ask the robot to return to its starting point or "home" and program the frequency at which the robot should pursue your watering schedule.
Up to a month's water supply can be stored in the robot. For those with very frequent water needs or who don't want to worry about refilling the robot, the robot can be hooked up to a water line.