Smart sprinklers only water your lawn when it's thirsty
 

Putting your sprinklers on a timer system is probably the best way to avoid under-watering your plants -- but the "set and forget" mentality isn't the most economical. What if it rains during the week and you forget to turn the timer off? Now you're...

http://www.engadget.com/2015/11/24/s...n-its-thirsty/