Adding sensor control is often easily said than done. Because there are many different types of sensors, their outputs vary significantly, and there are different ways to determine how each sensor should affect the sprinkler programs, it’s hard to have a one for all solution. If you have a specific sensor in mind, it’s not too hard to wire it to OpenSprinkler, and modify the code to add custom control tailored to your specific application. Part of the reason OpenSprinkler is open-source is to give users the flexibility to customize.