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

// Pin Definitions
#define DHT_PIN 21            // GPIO21 for DHT22 sensor data pin
#define RELAY_PIN 5           // GPIO5 for relay control
#define SOIL_MOISTURE_PIN1 34 // GPIO34 for Joystick (X-axis)
#define SOIL_MOISTURE_PIN2 35 // GPIO35 for Potentiometer (SIG)

// DHT Sensor Configuration
#define DHT_TYPE DHT22
DHT dht(DHT_PIN, DHT_TYPE);

// LCD Display
LiquidCrystal lcd(17, 16, 5, 18, 19, 23); // RS, E, D4, D5, D6, D7 pins

// Moisture threshold
int moistureThreshold = 40; // Adjust this threshold as needed

void setup() {
  // Start Serial Monitor
  Serial.begin(115200);

  // Initialize DHT sensor
  dht.begin();
  delay(1000); // Allow DHT sensor to stabilize

  // Initialize LCD
  lcd.begin(16, 2); // Initialize the 16x2 LCD
  lcd.print("Smart Plant Care System");
  delay(2000); // Hold the message for 2 seconds

  // Initialize Relay Pin
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW); // Initially off
}

void loop() {
  // Read soil moisture from Joystick (X-axis) and Potentiometer (SIG)
  int joystickMoisture = analogRead(SOIL_MOISTURE_PIN1); // Joystick
  int potMoisture = analogRead(SOIL_MOISTURE_PIN2);      // Potentiometer

  // Map the readings to a percentage (0-100%)
  int soilMoisture = map(joystickMoisture, 0, 4095, 0, 100);
  int potMoistureVal = map(potMoisture, 0, 4095, 0, 100);

  // Read DHT22 data (Temperature and Humidity)
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

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

  // Log data to the Serial Monitor
  Serial.print(F("Temperature: "));
  Serial.print(temperature);
  Serial.println(F("°C"));
  Serial.print(F("Humidity: "));
  Serial.print(humidity);
  Serial.println(F("%"));
  Serial.print(F("Soil Moisture (Joystick): "));
  Serial.print(soilMoisture);
  Serial.println(F("%"));
  Serial.print(F("Soil Moisture (Potentiometer): "));
  Serial.print(potMoistureVal);
  Serial.println(F("%"));

  // Control Relay based on soil moisture level
  if (soilMoisture < moistureThreshold || potMoistureVal < moistureThreshold) {
    digitalWrite(RELAY_PIN, HIGH); // Turn on water pump
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Watering Plants...");
    delay(1000);
  } else {
    digitalWrite(RELAY_PIN, LOW); 
    // Turn off water pump
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Soil Moisture OK");
    delay(1000);
  }

  // Display Temperature, Humidity, and Soil Moisture on LCD
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("Temp: " + String(temperature) + "C");
  lcd.setCursor(0, 0);
  lcd.print("Soil Moist: " + String(soilMoisture) + "%");

  delay(1000); // Wait for 2 seconds before the next update
}