Analog Capacitive Soil Moisture Sensor- Corrosion Resistant

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!

The product includes an on-board voltage regulator which gives it an operating voltage range of 3.3 ~ 5.5V. It is compatible with low-voltage MCUs (both 3.3V and 5V logic). To make it compatible with a Raspberry Pi, an ADC converter is required.

Features

• Supports Gravity 3-Pin interface
• Analog output

Applications

• Garden plants
• Moisture detection
• Intelligent agriculture

Specifications

• Operating Voltage: 3.3 ~ 5.5 VDC
• Output Voltage: 0 ~ 3.0VDC
• Interface: PH2.0-3P
• Dimension: 98mm * 23mm (3.86in x 0.905in)

References

• Product Wiki

Sample Code

/***************************************************
This example reads Capacitive Soil Moisture Sensor.
****************************************************/

const int AirValue = 520;   //you need to replace this value with Value_1
const int WaterValue = 260;  //you need to replace this value with Value_2
int intervals = (AirValue - WaterValue)/3;
int soilMoistureValue = 0;
void setup() {
Serial.begin(9600); // open serial port, set the baud rate to 9600 bps
}
void loop() {
soilMoistureValue = analogRead(A0);  //put Sensor insert into soil
if(soilMoistureValue > WaterValue && soilMoistureValue < (WaterValue + intervals))
{
Serial.println("Very Wet");
}
else if(soilMoistureValue > (WaterValue + intervals) && soilMoistureValue < (AirValue - intervals))
{
Serial.println("Wet");
}
else if(soilMoistureValue (AirValue - intervals))
{
Serial.println("Dry");
}
delay(100);
}