/*
 Voltaat learn (https://www.voltaat.com)
 Link for full tutorial:
 Tutorial: know when your plant needs watering

 The function of this sketch is to obtain the reading from
 the soil moisture sensor output through the Arduino's input.
 The sensor reading is inversely proportional to the presence of water on its surface.
 We will rely on the signal it sends to the Arduino to determine whether
 or not the soil needs water.

 Connections from the soil moisture sensor:
 • Positive pin→ comparator op-amp module positive pin
 • Negative pin→ comparator op-amp module negative pin

 Connections from the comparator op-amp module:
 • VCC pin → Arduino VCC pin (5V)
 • GND pin → Arduino GND pin
 • A0 pin → Arduino pin A0

*/


//Define the variable soilMoistureSensor to Analog Input Pin A0
const int soilMoistureSensor = A0;

//Define the threshold value
const int threshold = 480;

//Commands inside void setup run once
void setup() {
 //Start the serial monitor at 9600 baud rate (9600 bits per second)
 Serial.begin(9600);
 //soilMoistureSensor is defined as an input
 pinMode(soilMoistureSensor, INPUT);


}

//Commands inside void loop run forever
void loop() {
 //Read the value of analog input from soilMoistureSensor and assign it in the variable value
 int value = analogRead(soilMoistureSensor);

 if (value < threshold)
 {
   //Print to serial monitor
   Serial.print("Sensor Read= ");
   Serial.println(value);
   Serial.println("There is enough water, no need to water your plants");
 }
 else
 {
   //Print to serial monitor
   Serial.print("Sensor Read= ");
   Serial.println(value);
   Serial.println("The soil is very dry, you need to water your plants!");
 }

 //wait for one second
 delay(1000);


}