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This product measures soil moisture levels by capacitive sensing, rather than resistive sensing like other types of moisture sensor. It is made of a corrosion resistant material giving it a long service life. Insert it into soil and impress your friends with the real-time soil moisture data.

FEATURES

Supports Gravity 3-Pin Interface
Analog Output

APPLICATIONS

Gardening & Farming
Moisture Detection
Intelligent Agriculture

SPECIFICATION

Operating Voltage: 3.3 ~ 5.5 VDC
Output Voltage: 1.2 ~ 2.5V
Interface: PH2.0-3P
Dimension: 98mm * 23mm (3.86in x 0.905in)
Weight: 15g

Getting started with the Capacitive soil moisture sensor

This product measures soil mositure levels by capacitive sensing, rather than resistive sensing like other types of moisture sensor. It is made of a corrosion resistant materal giving it a long service life. Insert it into soil and impress your friends with the real-time soil moisture data!

Hardware required

Calibration Code

void setup() {

Serial.begin(9600); // open serial port, set the baud rate as 9600 bps

}

void loop() {

int val;

val = analogRead(0); //connect sensor to Analog 0

Serial.print(val); //print the value to serial port

delay(100);

}

NOTE:If you get stray ‘226’ in program the problem is with your ” ” and – characters. Replaces them with ordinary quotes “ and – And you should be fine.

Calibration Range

Open the serial port monitor and set the baud rate to 9600
Record the sensor value when the probe is exposed to the air as “Value 1”. This is the boundary value of dry soil “Humidity: 0%RH”
Take a cup of water and insert the probe into it no further than the red line in the diagram
Record the sensor value when the probe is exposed to the water as “Value 2”. This is the boundary value of moist soil “Humidity: 100%RH”

Section Settings

The final output value is affected by probe insertion depth and how tight the soil packed around it is. We regard “value_1” as dry soil and “value_2” as soaked soil. This is the sensor detection range.

For example: Value_1 = 520; Value_2 = 260.

The range will be divided into three sections: dry, wet, water. Their related values are: