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I've done the same thing and it works just fine. Look up the STC-1000 on ebay or Amazon. It's about $15 and you'll just need a few other components. The bonus is that it has a hot side and a cold side, so you can use it to control a crockpot, or use it to temperature control a fridge or freezer (for brewing, etc).
The idea is that this garden is designed to be a self-wicking design like the Earthbox, but on a larger scale. If you're not familiar with self-wicking/self-watering beds, check them out. They are efficient and the plants get the water as they need them. The overflow prevents it from becoming a bed of mud, and the soil above the water reservoir uses capillary action to wick the water from the base up to the plants' root level.
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