Soil moisture indicator device

摘要

A soil moisture indicator device for plants comprises an electrical circuit which includes an unbalanced resistive bridge having the common junctions of the resistors on its opposite sides connected to control the switching of a pair of indicator lights. Current drawn through the resistance of the soil as sensed by a probe is used to adjust the output voltages on the sides of the unbalanced resistive bridge to switch on one of the indicator lights if the soil has at least an adequate moisture content and to switch on the other of the indicator lights if the soil has an excessive moisture content.