In this section, we will see the testing of humidity inside a plant and the soil using a sensor:

I will now go through the main parts of this first piece of code. Then we set up the serial communication: 

int value;   
 
void setup() { 
Serial.begin(9600); 
}  

In the main loop, we will read the analog signal from the sensor:

void loop(){   
Serial.print("Humidity sensor value:"); 
Value = analogRead(0);   
Serial.print(value);   

We compare the value of the sensor and display the result on the serial interface:

if (Value<= 300)   
Serial.println(" Very wet");   
if ((Value > 300) and (Value<= 700))   
Serial.println(" Wet, do not water");    
if (Value> 700)   
Serial.println(" Dry, you need to water");  
delay(1000);  
} 

Here, the screenshot shows the results of the readings:

The following screenshot shows that the plant doesn't require water;  because it has enough...