Abstract
Soil moisture is a vital component for plant growth. There are many electro-chemical low-cost sensors that sense soil moisture with immediate effect rather than other methods such as gravimetric method and others that are expensive as well as consume lot of time. Some of these electro-chemical sensors work on resistivity whereas some sensors work on capacitance. This paper compares the efficiency of resistivity-based sensors with capacitance-based soil moisture sensors so that farmers and experts can use the better one for designing IoT-based irrigation monitoring and controller system. This comparison is performed with 21 samples having different levels of soil water content. The coefficient of variation is calculated to compare the efficiency of both the sensors. After the comparison, calibration has also been performed that depicts the soil moisture content to LCD display and alert the farmer by a buzzer.
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