Arduino in combination with soil moisture sensor

Quick guide shows how to use the soil moisture sensor with Arduino microcontroller.

 

In this example we used the following elements:

 

Connection

The module works directly with the Arduino, so no need for an external source of energy. Contacts connect your null-modem according to the following table:

 

Pin Arduino Pin Sensor
5 V VCC
GND GND
pin A0 A0
pin 2 D0

 

The remaining two pins from the sensor module connected to the measurement probe using the supplied cable as shown in the following figure:

 

Scheme of the system.

 

Service

The output D0 is in digital form. By default, in high condition, and upon detection of the moisture goes into a low state. The sensitivity can be regulated with the built-in potentiometer. The A0 analog output is working, and decreases the voltage with increasing moisture content (to it is inversely proportional). In the example we will use a simple program code that on a regular basis will show on the serial monitor the values read from A0 and D0.

 

int sensor_A0 = A0; // A0 for connection from the sensor to A0 on Arduino 
sensor_D0 int = 2; // connect D0 on the sensor to pin 2 of Arduino 
wartosc_A0 int; // variable for the value of A0 
wartosc_D0 int; // variable for the value of A0 

void setup() { 
 Serial.begin(9600); // start the monitor serial port 
 pinMode(2, INPUT); // set pin 2 as input 

} 

void loop() { 

 wartosc_A0 = analogRead(sensor_A0); // load the values for A0 
 wartosc_D0 = digitalRead(sensor_D0); // load values D0 

 Serial.print("D0: "); // display on serial monitor 
 Serial.print(wartosc_D0); 
 Serial.print(" -- A0: "); 
 Serial.println(wartosc_A0); 
 delay(200); // delay between consecutive readings 
 } 

 

The results of the program you can see in the following screenshot.

 

A screenshot of the serial monitor.

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