Automated Irrigation System / Soil Moisture Monitoring System

1#define GREEN_LED 2
2#define YELLOW_LED 3
3#define RED_LED 4
4#define SoilSensor A5 // Connected the soil moistures reading through analog pin A5
5#define DRY_THRESHOLD 800
6#define WET_THRESHOLD 500
7#define Relay 7
8
9void setup () {
10 pinMode(GREEN_LED, OUTPUT);
11 pinMode(YELLOW_LED, OUTPUT);
12 pinMode(RED_LED, OUTPUT);
13 pinMode(Relay, OUTPUT);
14
15 digitalWrite(GREEN_LED, LOW);
16 digitalWrite(YELLOW_LED, LOW);
17 digitalWrite(RED_LED, LOW);
18 digitalWrite(Relay, LOW);
19
20 Serial.begin(9600);//Tells the arduino to read data at a certain speed 
21 //this need to be the same as the serial monitors speed to be able to translate the values
22 delay(1000); //To give the port a second to wake up
23 }
24
25 void loop(){
26 int SensorValue = analogRead(SoilSensor); 
27 //Analog unlike digital spits out a range of values, int converts analog values from (Soilsensor) to integers.
28 //This is written under SensorValue 
29 Serial.print("Soil Sensor Value: "); // This prints the Soil sensor analog values on the serial monitor 
30 Serial.println(SensorValue); // This makes the values being printed after "Soil Sensor Value:" the values from SensorValue
31
32 if(SensorValue > 0 && SensorValue<=WET_THRESHOLD) {
33    //At 0 its completely wet, which means between 0 and Wet Threshold the green LED should turn on
34    digitalWrite(GREEN_LED, HIGH);
35    digitalWrite(YELLOW_LED, LOW);
36    digitalWrite(RED_LED, LOW);
37    digitalWrite(Relay, LOW);
38  } 
39   else if (SensorValue > WET_THRESHOLD && SensorValue <= DRY_THRESHOLD) {
40    // Between the Wet thershold and dry threshold the yellow LED should will turn on
41    digitalWrite(GREEN_LED, LOW);
42    digitalWrite(YELLOW_LED, HIGH);
43    digitalWrite(RED_LED, LOW);
44    digitalWrite(Relay, LOW);
45  }
46   else if (SensorValue > DRY_THRESHOLD) {
47    // Anything greater than the Dry Threshold and red LED will turn on and the relay will turn on activating the water pump
48    digitalWrite(GREEN_LED, LOW);
49    digitalWrite(YELLOW_LED, LOW);
50    digitalWrite(RED_LED, HIGH);
51    digitalWrite(Relay, HIGH);
52   }
53}