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영어

Background/Objectives: In recent years studies were done to determine the relationship of water content of the soil and its electrical resistivity, devices of different application can be construct using these relationship. The following applications benefitted from these findings like automatic water irrigation, soil moisture test for construction and watering system using soil moisture sensor. Methods/Statistical analysis: This study took advantage of the feature of microcontroller to sense varying resistance and controlling the solenoid water valve. The device is equipped with soil moisture sensor that varies its resistance depending on the conductivity of the soil. When the weather is to hot and the soil is dry, the resistance of the soil increases, if the soil is moist resistance of the soil decreases. Findings: The specific value of resistance was set in the microcontroller that signifies the need to water the plant using solenoid water valve. The controller will automatically open the gate valve of the water source, if the set resistance for watering was reached by the sensor. Improvements/Applications: Since water continuously enters the soil, it changes the resistivity of the soil. When the sensor reaches a resistance set in the microcontroller this will trigger the gate valve to close and signifies wet condition of the soil.