#include <LiquidCrystal.h>
#include <DHT.h>

int rs = D2;
int en = D3;
int d4 = D4;
int d5 = D5;
int d6 = D6;
int d7 = D7;

int soilMoisturePin = A0;
int ledPin = D8;
int moistureValue = 0;

#define DHTPIN D10
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

#define PIR_PIN D9
#define BUZZER_PIN D11

#define TRIG_PIN D12
#define ECHO_PIN D13

int ldrPin = A1;

int nitrogenPin = A2;
int phosphorousPin = A3;
int potassiumPin = A4;

LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

unsigned long previousMillis = 0;
const long buzzerDuration = 20000;
bool buzzerActive = false;

// Separate LED pins
#define RED_LED_PIN D14
#define GREEN_LED_PIN D15

void setup() {
  lcd.begin(16, 2);
  lcd.print("Soil Moisture:");
  Serial.begin(9600);
  dht.begin();
  pinMode(ledPin, OUTPUT);
  pinMode(PIR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  
  // Set LED pins as output
  pinMode(RED_LED_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);
}

void loop() {
  moistureValue = analogRead(soilMoisturePin);

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  int ldrValue = analogRead(ldrPin);

  int nitrogenValue = analogRead(nitrogenPin);
  int phosphorousValue = analogRead(phosphorousPin);
  int potassiumValue = analogRead(potassiumPin);

  long duration, distance;
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = (duration / 2) * 0.0343;

  Serial.print("Soil Moisture: ");
  Serial.println(moistureValue);
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");
  Serial.print("LDR Value: ");
  Serial.println(ldrValue);
  Serial.print("Nitrogen: ");
  Serial.println(nitrogenValue);
  Serial.print("Phosphorous: ");
  Serial.println(phosphorousValue);
  Serial.print("Potassium: ");
  Serial.println(potassiumValue);
  Serial.print("Distance: ");
  Serial.println(distance);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("SM: ");
  lcd.print(moistureValue);

  lcd.setCursor(0, 1);
  lcd.print("T: ");
  lcd.print(temperature, 1);
  lcd.print("C D: ");
  lcd.print(distance);

  if (moistureValue < 130) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  }

  int pirState = digitalRead(PIR_PIN);

  if (pirState == HIGH && !buzzerActive) {
    Serial.println("Motion detected!");
    digitalWrite(BUZZER_PIN, HIGH);
    Serial.println("Buzzer ON");
    buzzerActive = true;
    previousMillis = millis();
  }

  if (buzzerActive && (millis() - previousMillis >= buzzerDuration)) {
    digitalWrite(BUZZER_PIN, LOW);
    Serial.println("Buzzer OFF");
    buzzerActive = false;
  }

  
  int npkCombined = nitrogenValue + phosphorousValue + potassiumValue;
  if (npkCombined < 500) {
    digitalWrite(RED_LED_PIN, HIGH);  
  } else {
    digitalWrite(RED_LED_PIN, LOW);   
  }

  
  if (ldrValue + npkCombined + moistureValue > 150 && distance < 100 ) {
    digitalWrite(GREEN_LED_PIN, HIGH);  
  } else {
    digitalWrite(GREEN_LED_PIN, LOW);  
  }

  delay(2000);
}