The soil moisture sensor module has an operating voltage of 3.3V ~ 5V
This soil sensor module is constructed with 2 probes. These probes of the soil sensor module is used to measure the volumetric content of water.
The two probes allow the current to pass through the soil and then it gets the resistance value to measure the moisture value.
The soil sesnor module is also known as soil hygrometer and is specially designed to work well with all microcontrollers.
It features an On-board LM393 comparator and is integrated with power indicator LED.
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.