Quote:
Originally Posted by Topspinmo
Irrigation has rain sensor, it’s supposed to shut water off when raining or if rained enough to alter schedule. Don’t get no simpler than that.
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The rain sensor in reality is not very effective because it will not predict rain. All it does is if it rains, it will disable the controller for a certain period of time until it dries out delaying any additional watering. How many times have you seen everyone watering in the morning only to find we get torrential rain in afternoon. Total waste of water. Also, after 5 years or so the sponges in the rain sensor will dry up causing the sensor to stay stuck open. With the irrigation controllers like the Rachio, it's connected to the weather service so it tries to predict when it will rain based on that service and manage the watering accordingly.