Main Features:<br />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<br />Sensitivity can be adjusted (figure blue digital potentiometer adjust)<br />Soil humidity module on the environment humidity the most sensitive， generally used to detect soil humidity<br />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<br />Has fixed bolt hole， convenient installation<br />Comparator using LM393 chip， work stability<br />Two small plate interface specifications (3 wires)<br />- VCC external 3.3~5 V<br />- GND external GND<br />- DO small plate digital output interface (0 and 1)<br />- 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<br /><br />Frequently Asked Questions: <br />Q1. Why are these called "Arduino Compatible"? <br />A1. The Arduino group demanded us to remove their logos and rename these products so that they do not lead customers to believe they are the same units sold by Arduino<br />Q2. Are these 100% compatible with the "normal" Arduino's? <br />A2. Yes， they really are completely compatible with "normal" Arduino's. Build quality looks the same and everything (studio， library， tools， etc) just works<br /><br />    Specifications<br />General<br />  Type: Humidity sensor module                                                  <br />                        Model: FC-28                                                 <br />Connectivity<br />  Ports: GND， DO， VCC                                                 <br />Electronic Components<br />  Architecture: Arduino                                                  <br />                        Operating Voltage: 3.3-5V                                                  <br />                        PCB Size: 32 x 14mm                                                 <br />Weight and Size<br />  Product Weight: 0.007 kg                                                  <br />                        Package Weight: 0.050 kg                                                  <br />                        Product Size(L x W x H): 4.3 x 1.4 x 0.7 cm/ 1.7 x 0.6 x 0.7 inches                                                  <br />                        Package Size(L x W x H): 6.0 x 3.0 x 2.0 cm                                                 <br />Package Contents<br />  Package Contents: 1 x Soil Humidity Detection Sensor Module(with cable)                                                 <br /><br /><br /><br />                                                <br />