This items is designed to split 1Wire bus Plate containing 5 RJ11 sockets. Plate no include DS18B20 termal sensor
Sharp GP2Y0A02YK0F is analog distance sensor using infrared light and adopt triangular method to measure distance. Thanks is not sensitive for reflectivity of the object. Can be used as proximity sensor also. Output voltage is proportional to distance to object.
Sensor is open electric curcuit with operational amplifier. After putting measuring element (board) to wet ground on analog output A0 appear voltage inversely proportional to soil conductivity. It is if this base will be completely dry, output voltage will be high. Similary device can be used as flooding sensor.