Soil moisture indicator device

Details Soil moisture indicator device Soil moisture indicator device

1975-11-26

1977-04-26

Swisher, S. Clement

Electricity: measuring and testing

Conductor identification or location

Inaccessible

73 73, 324 65P, 340235, G01R 2702, G01N 2702

Patent

active

040204170

ABSTRACT:
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.

REFERENCES:
patent: 2437134 (1948-03-01), Smith
patent: 2768028 (1956-10-01), Robinson
patent: 2793527 (1957-05-01), Turner
patent: 2906952 (1959-09-01), Horecky
patent: 3882383 (1975-05-01), Matlin
patent: 3904960 (1975-09-01), Niehaus
patent: 3919631 (1975-11-01), Brown

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