Soil Hygrometer Humidity Detection Moisture Sensor Module for Arduino - Blue + Golden
Can be used to detect the moisture of soil or judge if there is water around it; Widely used in auto watering system reducing labour force; The drier the soil the lower of the voltage or vice versa; Just insert it into the soil and then read it; With the help of this sensor it will be realizable to make the plant remind you : Hey I am thirsty now please give me some water!