#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4); // Set the LCD I2C address to 0x27 for a 20x4 display
int soilMoisturePin = 12; // Soil moisture sensor pin
int vibrationPin = 27; // Vibration sensor pin
int buzzerPin = 2; // Buzzer pin
int greenLEDPin = 17; // Green LED pin
int yellowLEDPin = 16; // Yellow LED pin
int redLEDPin = 4; // Red LED pin
int t_p = 5;
int e_p = 18;
float ss = 0.034;
long durn;
float dist_cm;

void setup() {
  Serial.begin(115200);
  lcd.init(); // Initialize the LCD
  lcd.backlight(); // Turn on the backlight of the LCD
  pinMode(soilMoisturePin, INPUT);
  pinMode(vibrationPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(greenLEDPin, OUTPUT);
  pinMode(yellowLEDPin, OUTPUT);
  pinMode(redLEDPin, OUTPUT);
  pinMode(t_p, OUTPUT);
  pinMode(e_p, INPUT);
  lcd.setCursor(3,0);
  lcd.print("DEVELOPMENT OF");
  lcd.setCursor(3,1);
  lcd.print("LANDSLIDE EARLY");
  lcd.setCursor(3,2);
  lcd.print("WARNING SYSTEM");
  lcd.setCursor(6,3);
  lcd.print("WITH IOT");
  delay(3000);
  lcd.clear();
  lcd.setCursor(0, 0); // Set cursor to the first position of the first line
  lcd.print("Status   : "); // Print initial status on LCD
  lcd.setCursor(0, 1);
  lcd.print("Moisture: ");
  lcd.setCursor(0, 2);
  lcd.print("Distance: ");
  lcd.setCursor(0, 3);
  lcd.print("Vibration: ");
}

void loop() {// Ultrasonic distance measurement
  digitalWrite(t_p, LOW);
  delayMicroseconds(2);
  digitalWrite(t_p, HIGH);
  delayMicroseconds(10);
  digitalWrite(t_p, LOW);
  durn = pulseIn(e_p, HIGH);
  dist_cm = durn * ss / 2;

  // Display distance on Serial Monitor
  Serial.print("Distance: ");
  Serial.print(dist_cm);
  Serial.println(" cm");

  // Display distance on LCD
  lcd.setCursor(0, 2);
  lcd.print("Distance : ");
  lcd.print(dist_cm);
  lcd.print(" cm");
  
  int soilMoisture = analogRead(soilMoisturePin);
  int mappedMoisture = map(soilMoisture, 0, 4095, 0, 100); // Map soil moisture to 0-100 range
  int vibration = digitalRead(vibrationPin);
  lcd.setCursor(0, 1); // Set cursor to the first position of the second line
  lcd.print("Moisture : ");
  lcd.print(mappedMoisture);
  lcd.print("%   "); // Print percentage and spaces to clear previous data
  lcd.setCursor(0, 3); // Set cursor to the first position of the third line
  lcd.print("Vibration: ");
  lcd.print(vibration == 1 ? "Detected " : "None     ");

  // Display soil moisture and vibration on Serial Monitor
  Serial.print("Moisture : ");
  Serial.print(mappedMoisture);
  Serial.print("%   Vibration: ");
  Serial.println(vibration == 1 ? "Detected" : "None");

  if (mappedMoisture >= 80 && vibration == 1 || dist_cm <= 100 && vibration == 1) {
    digitalWrite(greenLEDPin, LOW);
    digitalWrite(yellowLEDPin, LOW);
    lcd.setCursor(11, 0);
    lcd.print("Unsafe ");

        for (int i = 0; i < 5; i++){  // Blink the LED 5 times
        digitalWrite(redLEDPin, HIGH); // Turn on the LED
        tone(buzzerPin, 1000); // Activate the buzzer
        delay(500); // LED and buzzer ON for 200 milliseconds
        digitalWrite(redLEDPin, LOW); // Turn off the LED
        noTone(buzzerPin); // Turn off the buzzer
        delay(100); // LED and buzzer OFF for 200 milliseconds
        } 

  }else if (mappedMoisture >= 80 && vibration == 0 || dist_cm <= 100 && vibration == 0){
    digitalWrite(greenLEDPin, LOW);
    digitalWrite(yellowLEDPin, LOW);
    digitalWrite(redLEDPin, HIGH);
    lcd.setCursor(11, 0);
    lcd.print("Danger ");
    }

  if (mappedMoisture > 50 && mappedMoisture < 80 && vibration == 1 || dist_cm > 100 && dist_cm < 200 && vibration == 1) {
    digitalWrite(greenLEDPin, LOW);
    digitalWrite(redLEDPin, LOW);
    lcd.setCursor(11, 0);
    lcd.print("Danger ");

        for (int i = 0; i < 5; i++) { // Blink the LED 5 times
        digitalWrite(yellowLEDPin, HIGH); // Turn on the LED
        tone(buzzerPin, 1000); // Activate the buzzer
        delay(500); // LED and buzzer ON for 200 milliseconds
        digitalWrite(yellowLEDPin, LOW); // Turn off the LED
        noTone(buzzerPin); // Turn off the buzzer
        delay(500); // LED and buzzer OFF for 200 milliseconds
        }
  
  }else if (mappedMoisture > 50 && mappedMoisture < 80 && vibration == 0 || dist_cm > 100 && dist_cm < 200 && vibration == 0){
    digitalWrite(greenLEDPin, LOW); // Turn off the green LED
    digitalWrite(yellowLEDPin, HIGH); // Turn on the yellow LED
    digitalWrite(redLEDPin, LOW); // Turn off the red LED
    lcd.setCursor(11, 0);
    lcd.print("Alert ");
  }

  if (mappedMoisture > 20 && mappedMoisture < 50 && vibration == 1 || dist_cm > 200 && dist_cm < 300 && vibration == 1){
    digitalWrite(greenLEDPin, HIGH);
    digitalWrite(yellowLEDPin, LOW);
    digitalWrite(redLEDPin, LOW);
    lcd.setCursor(11, 0);
    lcd.print("Alert ");

        for (int i = 0; i < 5; i++){   // Blink the LED 5 times
        digitalWrite(greenLEDPin, HIGH); // Turn on the LED
        tone(buzzerPin, 1000); // Activate the buzzer
        delay(1000); // LED and buzzer ON for 200 milliseconds
        digitalWrite(greenLEDPin, LOW); // Turn off the LED
        noTone(buzzerPin); // Turn off the buzzer
        delay(1000); // LED and buzzer OFF for 200 milliseconds
        }
        
  }else if (mappedMoisture > 20 && mappedMoisture < 50 && vibration == 0 || dist_cm > 200 && dist_cm < 300 && vibration == 0){
    digitalWrite(greenLEDPin, HIGH); // Keep the green LED constantly 0
    digitalWrite(yellowLEDPin, LOW);
    digitalWrite(redLEDPin, LOW);
    lcd.setCursor(11, 0);
    lcd.print("Stable ");
  }

  if (mappedMoisture <= 20 && dist_cm >= 300){
    digitalWrite(greenLEDPin, HIGH);
    digitalWrite(yellowLEDPin, LOW);
    digitalWrite(redLEDPin, LOW);
    lcd.setCursor(11, 0);
    lcd.print("Safe ");
  }
}