Feature:
1) This is a summary of the moisture sensor can be used to detect soil moisture , soil water when the module outputs a high level , whereas the output low. Using this sensor make an automatic watering system , so that your garden plants need people to manage .
2) adjustable sensitivity ( shown in blue digital potentiometer adjustment )
3) Operating Voltage 3.3V-5V
4) module dual output mode, the digital output is simple, analog output is more accurate.
5) with fixed bolt hole for easy installation
6) small PCB board size : 3cm * 1.6cm
7) power indicator ( red ) and digital switching output indicator ( green )
8) using LM393 comparator chip , stable

Module wiring instructions:
1) VCC 3.3V-5V external
2) GND GND External
3) DO small board digital output interface ( 0 and 1 )
4) AO small plates analog output interface