#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 = 14; // Soil moisture sensor pin
int vibrationPin = 13; // Vibration sensor pin
int vibrationThreshold = 2000;
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 = 33; //
int e_p = 32; //

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(1000);
  lcd.clear();
  lcd.setCursor(0, 0); // Set cursor to the first position of the first line
  lcd.print("Condition: "); 
  lcd.setCursor(0, 1); // Set cursor to the first position of the second line
  lcd.print("Moisture : ");
  lcd.setCursor(0, 2); // Set cursor to the first position of the third line
  lcd.print("Distance : ");
  lcd.setCursor(0, 3); // Set cursor to the first position of the forth line
  lcd.print("Vibration: ");
}

void loop() {

  long duration; // Ultrasonic measurement
  float distance;
  digitalWrite(t_p, LOW);
  delayMicroseconds(2);
  digitalWrite(t_p, HIGH);
  delayMicroseconds(10);
  digitalWrite(t_p, LOW);
  duration = pulseIn(e_p, HIGH);
  distance = duration * 0.034 / 2;
  
  int soilMoisture = analogRead(soilMoisturePin); // soil moisture measurement
  int mappedMoisture = map(soilMoisture, 0, 4095, 0, 100); // Map soil moisture to 0-100 range
  
  int vibrationValue = analogRead(vibrationPin); // vibration measurement
  bool newVibrationStatus = (vibrationValue >= vibrationThreshold);

  lcd.setCursor(0, 1); // Display mositure on LCD
  lcd.print("Moisture : ");
  lcd.print(mappedMoisture);
  lcd.print(" %   "); 

  Serial.print("Moisture : ");// Display moisture on Serial Monitor
  Serial.print(mappedMoisture);
  Serial.println(" %");

  lcd.setCursor(0, 2); // Display distance on LCD
  lcd.print("Distance : ");
  lcd.print((int)distance);
  lcd.print(" cm   ");

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

  lcd.setCursor(0, 3); // Display vibration on LCD
  lcd.print("Vibration: ");
  lcd.print(vibrationValue);
  lcd.print(" g   "); 

  Serial.print("Vibration: "); // Display vibration on Serial Monitor
  Serial.print(vibrationValue);
  Serial.println(" g");

  // Danger condition which is moisture is more than or equal to 70% and distance is less than or equal to 100cm
  if (mappedMoisture >= 70 && vibrationValue >= vibrationThreshold ||
  distance <= 100 && vibrationValue >= vibrationThreshold) {
      Serial.println("Danger Condition Detected !!! ");
      digitalWrite(greenLEDPin, LOW);
      digitalWrite(yellowLEDPin, LOW);
      lcd.setCursor(11, 0);
      lcd.print("Danger ");
          for (int i = 0; i < 1; i++){  
          digitalWrite(redLEDPin, HIGH); 
          tone(buzzerPin, 1000); 
          delay(500); 
          digitalWrite(redLEDPin, LOW); 
          noTone(buzzerPin); 
          delay(500); 
          }

  // Danger condition which is moisture is more than or equal to 70% and distance is less than or equal to 100cm
  }else if (mappedMoisture >= 70 && vibrationValue <= vibrationThreshold ||
  distance <= 100 && vibrationValue <= vibrationThreshold){
      digitalWrite(greenLEDPin, LOW);
      digitalWrite(yellowLEDPin, LOW);
      digitalWrite(redLEDPin, HIGH);  
      lcd.setCursor(11, 0);
      lcd.print("Danger ");
  }

  // Alert condition which is moisture is between 30% and 70% and distance is between 100cm and 200cm
  if (mappedMoisture > 30 && mappedMoisture < 70 && vibrationValue >= vibrationThreshold ||
  distance > 100 && distance < 200 && vibrationValue >= vibrationThreshold) {
      Serial.println("Alert Condition Detected ! ");    
      digitalWrite(greenLEDPin, LOW);
      digitalWrite(redLEDPin, LOW);
      lcd.setCursor(11, 0);
      lcd.print("Alert  ");
          for (int i = 0; i < 1; i++) { 
          digitalWrite(yellowLEDPin, HIGH); 
          tone(buzzerPin, 1000); 
          delay(500); 
          digitalWrite(yellowLEDPin, LOW); 
          noTone(buzzerPin); 
          delay(500); 
          }

  // Alert condition which is moisture is between 30% and 70% and distance is between 100cm and 200cm
  }else if (mappedMoisture > 30 && mappedMoisture < 70 && vibrationValue <= vibrationThreshold ||
  distance > 100 && distance < 200 && vibrationValue <= vibrationThreshold){
      digitalWrite(greenLEDPin, LOW); 
      digitalWrite(yellowLEDPin, HIGH); 
      digitalWrite(redLEDPin, LOW); 
      lcd.setCursor(11, 0);
      lcd.print("Alert  ");
  }

  // Safe condition which is moisture is between 5% and 30% and distance is between 200cm and 300cm
  if (mappedMoisture > 5 && mappedMoisture < 30 && vibrationValue >= vibrationThreshold ||
  distance > 200 && distance < 300 && vibrationValue >= vibrationThreshold){
      digitalWrite(greenLEDPin, HIGH);
      digitalWrite(yellowLEDPin, LOW);
      digitalWrite(redLEDPin, LOW);
      lcd.setCursor(11, 0);
      lcd.print("Safe   ");
          for (int i = 0; i < 1; i++) { 
          digitalWrite(greenLEDPin, HIGH); 
          delay(500); 
          digitalWrite(greenLEDPin, LOW); 
          delay(500); 
          } 

  // Safe condition which is moisture is between 5% and 30% and distance is between 200cm and 300cm
  }else if (mappedMoisture > 5 && mappedMoisture < 30 && vibrationValue <= vibrationThreshold ||
  distance > 200 && distance < 300 && vibrationValue <= vibrationThreshold){
            digitalWrite(greenLEDPin, HIGH);
            digitalWrite(yellowLEDPin, LOW);
            digitalWrite(redLEDPin, LOW);
            lcd.setCursor(11, 0);
            lcd.print("Safe   ");
  }

  if (mappedMoisture <= 5 && distance >= 300){
    digitalWrite(greenLEDPin, HIGH);
    digitalWrite(yellowLEDPin, LOW);
    digitalWrite(redLEDPin, LOW);
    lcd.setCursor(11, 0);
    lcd.print("Safe   ");
  }  
}