If you live in the Northern Hemisphere, summer is either just around the corner, or has already arrived in practical terms. Either way, if you now have to worry about watering your lawn, setting up an automatic timer isn’t the most convenient thing interface-wise.
Not a fan of cheap irrigation programmers, developer “ClemRZ” solved this first world problem by customizing his system with an ESP8266 module, allowing the sprinklers to be turned on and off remotely over Wi-Fi.
Instead of creating an entirely new UI, ClemRZ integrated it with Google Calendar via a script, using events to command a latching solenoid valve at the right time.
Future upgrades include controlling multiple sprinkler zones as well as using third-party services like IFTTT for weather-dependent events. Looking for a way to help keep your grass nice and green? Check out the entire build on Instructables.