Soil Moisture Sensor Module for Arduino Robotics Respberry Hygrometer

Overview
This is a simple water sensor, can be used to detect soil moisture. Module Output is high level when the soil moisture deficit,or output is low. Can be used in module plant waterer device, and the plants in your garden no need people to manage. 

Soil moisture module is most sensitive to the ambient humidity is generally used to detect the moisture content of the soil. Module to reach the threshold value is set in the soil moisture, DO port output high, when the the soil humidity exceeds a set threshold value, the module D0 output low. The digital output D0 can be connected directly with the microcontroller to detect high and low by the microcontroller to detect soil moisture. The digital outputs DO also can connect to relay module directly to drive buzzer module, which can form a soil moisture alarm equipment. Analog output AO can be connected through the AD converter or microcontroller analog port to get more precise values of soil moisture.
 

Features
Operating voltage: 3.3V~5V 
Dual output mode,analog output more accurate
A fixed bolt hole for easy installation 
With power indicator (red) and digital switching output indicator (green)
Stable comparator chip
Panel PCB Dimension: Approx.3cm x 1.5cm
Soil Probe Dimension: Approx. 6cm x 3cm
VCC: 3.3V-5V 
GND: GND
DO: digital output interface(0 and 1)
AO: analog output interface

Package includes
1 x Soil Moisture Sensor 
1 x Soil Moisture Detector Module
1 x Female to Female Jumper Wire