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I'm always looking for easy ways to cross things off my
daily to-do list. With the gazillion (yeah, I said it…gazillion) things we do
daily, it's nice when we can automate something.
Fortunately watering your plants is now an automated
option. A self-watering
plant system (cool video), powered by an Arduino, is the set it and forget
it time saver.
vs. 
The difference water can make…Image Credit: ehow
and mamypap.com
The instructions on building these self-watering systems
are available on Instructables.
It requires quite a bit of parts, and some mechanical/electrical knowledge
(nothing you guys can't handle). Instructables offers step-by-step instructions
and beautiful images to help you out. The hardest part would be programming the
Arduino, but the website also gives you the exact code so you don't have to
figure out the algorithm.
How it Works
The systems works with a set of sensors that detect when
the soil is dry; based on a signal the system will water the plant accordingly.
Depending on the type of plant and the conditions of the environment, the
program can be adjusted to ensure the plant is getting the right amount of
water.

Self-watering system. Image
Credit: Instructables
The Catch
Unfortunately you do have to remember something, and that
is to refill the water reservoir as needed. Even this task can be diminished by
scaling this project to an aquaponics system. Aquaponics is the combination of
aquaculture and hydroponics, aka you grow fish and plants together in one
integrated, soilless system. I've seen a couple of aquaponics systems first
hand and I think the concept is pretty brilliant. The plants grow above a tank
of fish. The waste produced by the fish provides a food source for the plants
and the plants filter the water for the fish. Because the system is relatively
self-sustaining, quality crops can be grown on a year-round basis, anywhere in
the world.

Basics of Aquaponics. Image
Credit: Nourishtheplant.com
The self-watering device could be combined with this setup
in order to design your own back-yard
aquaponics system. Large scale, this could be a year-round garden. Small
scale, you have a nice kitchen herb garden.
As a last note, for those who are not so programming
savvy or just need a quick fix when going on vacation, I found instructions on
how to make a self-watering
system with a water bottle and a tray.
Resources
Arduino-powered
plant can water itself, thank you very much
Grow Fish and Veggies
Year 'Round
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