This is a easy to use soil moisture sensor. Just insert the sensor in the soil and it can can measure moisture or water around it.
The sensor includes a potentiometer to set the desired moisture threshold. When the sensor measures more moisture than the threshold, the digital output goes high and an LED indicates the output. The digital output can be connected to a micro controller to sense the moisture. The sensor also outputs an analog output which can be connected to the ADC of a micro controller.
This sensor is great for making water gardening projects, water sensing, etc