Meet the viRaCube: a smart solution for watering your garden properly. It uses sensors to measure the water in the ground to determine how much water your plants will need. It has 4 components: an app, a cube, valves, and sensors.
You can use the companion app to monitor the state of your garden at any time. The Sensor measures soil moisture, temperature, humidity and brightness. No cables to deal with. More info is available on Kickstarter.