/*******************************
  IOT MINI PROJECT CODE
  PG50 Ayush Sharma
**********************************/

// Include the necessary libraries
#include <OneWire.h>
#include <DallasTemperature.h>
#include <Wire.h>
#include <WiFi.h>
#include <DHT.h>
#include <Adafruit_NeoPixel.h>
#include <LiquidCrystal_I2C.h> // Library for LCD 2004 I2C

const char* ssid = "Wokwi-GUEST";
const char* password = "";

/******************____PH Sensor___*****************/
const int sensorPin = 36;  // Analog pin for pH sensor
float voltage, pH;

/******************____LDR___*****************/
const int ldrPin = 34; // Define the analog input pin for the LDR sensor

/******************____LED___*****************/
const int LED_PIN = 13; // Pin no.
#define NUM_LEDS 35 // No of LEDs
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);

/******************____DHT11___*****************/
#define DHTPIN 5
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE); // Initialize DHT sensor

/******************____Relay___*****************/
#define RELAY_PIN 2 // GPIO pin connected to the relay
#define ON_TIME 10000 // Relay ON duration in ms
#define OFF_TIME 10000 // Relay OFF duration in ms

/******************____LCD___*****************/
LiquidCrystal_I2C lcd(0x27, 20, 4); // LCD I2C address 0x27, 20 columns, 4 rows

/******************____DS18B20___*****************/
#define ONE_WIRE_BUS 4 // GPIO pin connected to DS18B20 sensor
OneWire oneWire(ONE_WIRE_BUS); // OneWire instance
DallasTemperature sensors(&oneWire); // DallasTemperature instance

/******************____HC-SR04___*****************/
#define TRIG_PIN 18 // Trig pin
#define ECHO_PIN 19 // Echo pin
long duration; // Pulse duration
float distanceCm; // Distance in cm

TaskHandle_t Task1; // Task handle for the second core

void loop2(void *parameter) { // Second loop working parallel to the main loop
  for (;;) {
    digitalWrite(RELAY_PIN, HIGH); // Turn on relay
    delay(ON_TIME);
    digitalWrite(RELAY_PIN, LOW); // Turn off relay
    delay(OFF_TIME);
  }
}

// Setup function
void setup() {
  xTaskCreatePinnedToCore(
    loop2,
    "buttonCheck",
    1000,
    NULL,
    1,
    &Task1,
    0
  );

  Serial.begin(115200); // Start serial communication
  WiFi.begin(ssid, password);
  int retry_count = 0;
  while (WiFi.status() != WL_CONNECTED && retry_count < 20) {
    delay(1000);
    Serial.println("Attempting to connect to WiFi...");
    retry_count++;
  }
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("WiFi connected successfully!");
  } else {
    Serial.println("Failed to connect to WiFi.");
  }

  /******************____LED___*****************/
  strip.begin();
  strip.setBrightness(255);
  strip.show();

  /******************____DHT11___*****************/
  dht.begin();

  /******************____Relay___*****************/
  pinMode(RELAY_PIN, OUTPUT);

  /******************____DS18B20___*****************/
  sensors.begin();

  /******************____HC-SR04___*****************/
  pinMode(TRIG_PIN, OUTPUT); // Set Trig as OUTPUT
  pinMode(ECHO_PIN, INPUT);  // Set Echo as INPUT

  /******************____LCD___*****************/
  lcd.init();
  lcd.backlight(); // Turn on LCD backlight
  lcd.setCursor(0, 0);
  lcd.print("System Initialized");
  delay(2000);
}

// Main loop
void loop() {
  delay(1000);

  /******************____HC-SR04___*****************/
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distanceCm = duration / 58.2;

  /******************____PH Sensor___*****************/
  voltage = analogRead(sensorPin) * 5.0 / 1024.0;
  pH = 7 - (voltage - 2.5) / 0.18;

  /******************____LDR___*****************/
  int rawValue = analogRead(ldrPin);
  int percentage = map(rawValue, 0, 4095, 0, 100);
  int brightness = map(percentage, 0, 100, 255, 0);

  /******************____LED___*****************/
  strip.setBrightness(brightness);
  for (int i = 0; i < NUM_LEDS; i++) {
    strip.setPixelColor(i, 75, 0, 130);
  }
  strip.show();

  /******************____DHT11___*****************/
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  /******************____DS18B20___*****************/
  sensors.requestTemperatures();
  float temperatureC = sensors.getTempCByIndex(0);

  /******************____SerialPrint___*****************/
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(" LightIntensity: ");
  Serial.print(percentage);
  Serial.print(" Water Level Distance: ");
  Serial.print(distanceCm);
  Serial.print(" cm");
  Serial.print("pH: ");
  Serial.print(pH);

  /******************____LCD Display___*****************/
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(t);
  lcd.print("°C");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(h);
  lcd.print("%");

  lcd.setCursor(0, 2);
  lcd.print("pH: ");
  lcd.print(pH);

  lcd.setCursor(0, 3);
  lcd.print(" WL: ");
  lcd.print(distanceCm);
  lcd.print("cm");
}