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This soil moisture sensor module can be used to detect the moisture of soil or judge if there is water around the sensor, let the plants in your garden reach out for human help. Insert this module into the soil and then adjust the on-board potentiometer to adjust the sensitivity. The sensor would outputs logic high or low when the moisture is higher or lower than the threshold set by the potentiometer. With help of this sensor, it will be realizable to make the plant remind you: Hey, i am thirsty now, please give me some water.