Descriptions

• This is a summary of the moisture sensor can be used to detect soil moisture, when soil water deficiency, the module outputs a high level, whereas output low level. Using this sensor to water the flowers make an automatic device, without people to manage your garden plants.
• Sensitivity can be adjusted (figure blue digital potentiometer adjust)
• Soil humidity module on the environment humidity the most sensitive, generally used to detect soil humidity
• Module in soil moisture can not reach the setting threshold, DO mouth output high level, when soil moisture more than setting threshold value, module D0 output low level
• Has fixed bolt hole, convenient installation
• Comparator using LM393 chip, work stability
• Two small plate interface specifications (3 wires)
• - VCC external 3.3~5 V
• - GND external GND
• - DO small plate digital output interface (0 and 1)
• - Digital output D0 can be directly connected with the single chip microcomputer, through the single chip microcomputer to detect high and low level, thus to detect soil humidity

Commonly Asked Questions: 

Q1. Why are these called "Arduino Compatible"? 
A1.The Arduino group demanded us to remove their logos and rename theseproducts so that they do not lead customers to believe they are the sameunits sold by Arduino. 
 
Q2. Are these real Arduinos, then? 
A2. We cannot answer that question without starting a war :(. Officially, the answer is we do not know. 
 
Q3. Are these 100% compatible with the "normal" Arudinos? 
A3.Yes, they really are completely compatible with "normal" Arduinos.Build quality looks the same and everything (studio, library, tools,etc) just works. Just read the reviews here, here, here, and here. 
 
Q4. What if Im still concerned about the missing logos and about this being named as "Arduino Compatible"? 
A4.If youre still in doubt, please buy from Arduinos official dealers.Yes they are more expensive, but if youre still worried wed rather nottake your order. We do not make these afterall and we are providing allthe information we know. Dont kill the messenger.