AC_OPERATED_WATERING_CONTROL_SYSTEM

Published:2009/7/17 4:02:00 Author:Jessie | From:SeekIC

Ac operation of the circuit reduces possible electrolysis effects over time. Two probes are inserted into the soil. When the soil is wet, it is more conductive and Q1 conducts, cutting Q2 off. As the soil dries, Q1 loses bias, allowing Q2 to turn on, actuating the relay (RY1). RY1 closes, operating the watering-system control valve. When the soil is sufficiently moist, Q1 turns on, cutting off Q2, RY1, and the water valve. R2 sets the trip level.



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