Model: FC-28-B - Color: Blue - Material: PCB - 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 - Working voltage of 3.3~5V - Has fixed bolt hole convenient installation - Small board PCB size: 3.2cm x 1.4cm - 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 - Packing List: - 1 x Soil humidity sensor module - 1 x Soil sensor - 2 x Dupont cable (20cm)