Aktronics LM393 3.3V-5V Soil Moisture Detect Sensor Soil Moisture Sensor Soil Hygrometer Detection with 20 Pcs Jumper Wire for Arduino Automatic Watering System Robot (Pack of 5) Electronic Components Electronic Hobby Kit

Wiring ( 4 -wire )? 1?VCC external 3.3V-5V 2?GND External 3?DO small board digital output interfaces ( 0 and 1 ) 4?AO analog output voltage of small plates Instruction: 1.Sensor for detecting moisture in the soil 2.Sodule is the blue potentiometer to adjust the threshold for soil moisture , clockwise adjustment, control humidity will be bigger, smaller counter-clockwise 3.Digital outputs D0 can be directly connected with the microcontroller through the microcontroller to detect high and low , thereby detecting soil moisture 4.Small plates AO analog output modules can be connected and AD through the AD converter , you can get a more accurate value of soil moisture 5.Operating Voltage 3.3V-5V 6.Has a fixed holes for easy installation 7.PCB Size : 3.2cm * 1.4m