Simple Soil Moisture Sensor

1int greenLight = 0; //Defining pins
2int yellowLight = 1;
3int redLight   = 2;
4int piezoBuzzer = 3;
5int maximumMoistureLevel; //The max moisture level   and current moisture levels will be needed for percentage calculations
6int currentMoistureLevel;//Like   so: current/max*100 = Moisture level as a percentage
7
8void moistureDetection(){   //Create a function for all the long code, to keep the loop free
9  if(currentMoistureLevel/maximumMoistureLevel   <= 0.1){ //If the moisture is below 10%
10    digitalWrite(greenLight, LOW);
11     digitalWrite(yellowLight, LOW);
12    digitalWrite(redLight, HIGH); //Switch   on red light, and sound the buzzer
13    tone(piezoBuzzer, 5000, 500);
14    delay(2000);
15   }else if (currentMoistureLevel/maximumMoistureLevel <= 0.3 && currentMoistureLevel/maximumMoistureLevel   > 0.1)
16  {//if the moisture level is in between 10 and 30%
17    digitalWrite(greenLight,   LOW);
18    digitalWrite(yellowLight, LOW);
19    digitalWrite(redLight, HIGH);   //Switch red light on, but don't sound the buzzer
20  }else if (currentMoistureLevel/maximumMoistureLevel   <= 0.6 && currentMoistureLevel/maximumMoistureLevel > 0.3)
21  {//if the moisture   level is in between 30 and 60%
22    digitalWrite(greenLight, LOW);
23    digitalWrite(yellowLight,   HIGH);//Just switch yellow light on
24    digitalWrite(redLight, LOW);
25  } else   //Otherwise the moisture level is above 60%, and therefore it's good enough
26   {
27    digitalWrite(greenLight, HIGH);//Switch green light on
28    digitalWrite(yellowLight,   LOW);
29    digitalWrite(redLight, LOW);
30  }
31}
32
33void setup() {
34   for (int i = 0; i < 4; i++)//Use a for loop, to not have to initiate all the pins   by hand
35  {
36    pinMode(i, OUTPUT);
37  }
38  pinMode (A0, INPUT); //A0   is the pin used for the Soil Moisture Sensor
39  maximumMoistureLevel = analogRead(A0);
40   tone(piezoBuzzer, 5000, 500);
41  delay(200);
42  tone(piezoBuzzer, 6000, 500);//Make   a sound to show that the program has been initiated.
43  delay(600);
44}
45
46void   loop() {
47  currentMoistureLevel = analogRead(A0); //Keep renewing the readings   for the current moisture level
48  moistureDetection();
49  delay(100); //Short   delay to not overload the program
50  Serial.println(currentMoistureLevel);//Just   so you can see the moisture level as a reading between 0-1023
51  
52  
53}

1int greenLight = 0; //Defining pins
2int yellowLight = 1;
3int redLight  = 2;
4int piezoBuzzer = 3;
5int maximumMoistureLevel; //The max moisture level  and current moisture levels will be needed for percentage calculations
6int currentMoistureLevel;//Like  so: current/max*100 = Moisture level as a percentage
7
8void moistureDetection(){  //Create a function for all the long code, to keep the loop free
9  if(currentMoistureLevel/maximumMoistureLevel  <= 0.1){ //If the moisture is below 10%
10    digitalWrite(greenLight, LOW);
11    digitalWrite(yellowLight, LOW);
12    digitalWrite(redLight, HIGH); //Switch  on red light, and sound the buzzer
13    tone(piezoBuzzer, 5000, 500);
14    delay(2000);
15  }else if (currentMoistureLevel/maximumMoistureLevel <= 0.3 && currentMoistureLevel/maximumMoistureLevel  > 0.1)
16  {//if the moisture level is in between 10 and 30%
17    digitalWrite(greenLight,  LOW);
18    digitalWrite(yellowLight, LOW);
19    digitalWrite(redLight, HIGH);  //Switch red light on, but don't sound the buzzer
20  }else if (currentMoistureLevel/maximumMoistureLevel  <= 0.6 && currentMoistureLevel/maximumMoistureLevel > 0.3)
21  {//if the moisture  level is in between 30 and 60%
22    digitalWrite(greenLight, LOW);
23    digitalWrite(yellowLight,  HIGH);//Just switch yellow light on
24    digitalWrite(redLight, LOW);
25  } else  //Otherwise the moisture level is above 60%, and therefore it's good enough
26  {
27    digitalWrite(greenLight, HIGH);//Switch green light on
28    digitalWrite(yellowLight,  LOW);
29    digitalWrite(redLight, LOW);
30  }
31}
32
33void setup() {
34  for (int i = 0; i < 4; i++)//Use a for loop, to not have to initiate all the pins  by hand
35  {
36    pinMode(i, OUTPUT);
37  }
38  pinMode (A0, INPUT); //A0  is the pin used for the Soil Moisture Sensor
39  maximumMoistureLevel = analogRead(A0);
40  tone(piezoBuzzer, 5000, 500);
41  delay(200);
42  tone(piezoBuzzer, 6000, 500);//Make  a sound to show that the program has been initiated.
43  delay(600);
44}
45
46void  loop() {
47  currentMoistureLevel = analogRead(A0); //Keep renewing the readings  for the current moisture level
48  moistureDetection();
49  delay(100); //Short  delay to not overload the program
50  Serial.println(currentMoistureLevel);//Just  so you can see the moisture level as a reading between 0-1023
51  
52  
53}