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Description: It can avoid the problem that the resistive sensor is easily corroded, which greatly prolongs its working life. In contrast to the normal resistive sensor, this capacitive soil moisture sensor has no adjustable switching contact. It changes with the humidity. Thus displays the exact humidity values ??in real time. APPLICATION: Applications : Used to garden plants, moisture detection, intelligent agriculture. Connect with a screen, a motherboard, you will know real-time soil moisture data, see if your beloved plant is thirsty. Garden plants / Moisture detection / Intelligent agriculture PARAMETERS: Working voltage: 3.3 ~ 5.5 VDC Output voltage: 0 ~ 3.0 VDC Interface: PH2.54-3P Size: about 98 x 23mm (LxW)/3.86*0.91in Ver: 1.2 or 2.0 or higher How to Use: Step 1: Open the serial monitor and set the baud rate to 9600 Step 2: Place the sensor in the air to read the analog value which represents the moisture is "DRY", marking the value as "A" Step 3: Take a glass of water and insert the sensor into the water at a certain depth, and record analog value which represents the moisture is "100% humidity", marking the value as "B" Step 4: Then insert the sensor into soil at the same depth as step 3, and record analog value which represents the moisture of soil, marking the value as "C" Step 5: Calculation: Soil Moisture = (C-A)/(B-A)*100%