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

// DHT settings
#define DHTPIN 12  // DHT22 data pin connected to GPIO 12
#define DHTTYPE DHT22 // Change to DHT11 if you're using DHT11
DHT dht(DHTPIN, DHTTYPE);

// Soil moisture sensor pin
#define SOIL_MOISTURE_PIN 13

// Ultrasonic sensor pins
#define TRIG_PIN 4 // D2
#define ECHO_PIN 5 // D1

// Relay pin
#define RELAY_PIN 26

// LDR sensor pin
#define LDR_PIN 34

// I2C LCD display settings
#define I2C_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_ROWS);

// Water level thresholds
#define WATER_LOW_THRESHOLD 25 // 25% water level
#define WATER_HIGH_THRESHOLD 98 // 98% water level

// Calibration values for LDR sensor
const float LDR_CALIBRATION_FACTOR = 1.0; // Adjust this based on your calibration
const float LDR_CALIBRATION_INTERCEPT = 0.0; // Adjust this based on your calibration

void setup() {
  Serial.begin(115200);

  // Setup DHT sensor
  dht.begin();

  // Setup relay pin
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW); // Turn off relay initially

  // Setup ultrasonic sensor pins
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  // Initialize LCD display
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("GreenhouseSystem");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Read temperature and humidity
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  // Read soil moisture
  int soilMoistureValue = analogRead(SOIL_MOISTURE_PIN);
  float soilMoisturePercent = map(soilMoistureValue, 0, 4095, 0, 100);

  // Read water level
  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) / 29.1;

  // Calculate water level percentage based on distance
  int waterLevelPercent = 0;
  if (distance <= 20) {
    waterLevelPercent = 100;
  } else if (distance <= 60) {
    waterLevelPercent = 75;
  } else if (distance <= 200) {
    waterLevelPercent = 50;
  } else if (distance <= 300) {
    waterLevelPercent = 25;
  } else {
    waterLevelPercent = 0;
  }

  // Control relay based on water level
  if (waterLevelPercent < WATER_LOW_THRESHOLD) { // If water level is below 25%
    digitalWrite(RELAY_PIN, HIGH); // Turn on pump
  } else if (waterLevelPercent >= WATER_HIGH_THRESHOLD) { // If water level is 98% or more
    digitalWrite(RELAY_PIN, LOW); // Turn off pump
  }

  // Read LDR sensor value
  int ldrValue = analogRead(LDR_PIN);
  // Convert LDR value to lux based on calibration
  float lux = ldrValue * LDR_CALIBRATION_FACTOR + LDR_CALIBRATION_INTERCEPT;

  // Display sensor values on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(t, 1);
  lcd.print("C ");
  lcd.print("H:");
  lcd.print(h, 1);
  lcd.print("%");

  lcd.setCursor(0, 1);
  lcd.print("S:");
  lcd.print(soilMoisturePercent, 1);
  
  lcd.print("% W:");
  lcd.print(waterLevelPercent);
  lcd.print("%");

  // Wait 5 seconds before switching to the next display
  delay(5000);

  // Display light intensity (lux) on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Light Intensity:");
  lcd.setCursor(0, 1);
  lcd.print(lux);
  lcd.print(" lux");

  // Wait 5 seconds before switching to the next display
  delay(3000);

  // Display pump status on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Pump Status:");
  lcd.setCursor(0, 1);
  if (digitalRead(RELAY_PIN) == HIGH) {
    lcd.print("ON ");
  } else {
    lcd.print("OFF");
  }

  // Wait 5 seconds before updating the readings again
  delay(3000);
}