#define BLYNK_TEMPLATE_ID "TMPL3GT5K5MBx"
#define BLYNK_TEMPLATE_NAME "project"
#define BLYNK_AUTH_TOKEN "8aaaJNMbX6PprvJooIcBv-ImCNIe2K9S"
// Libraries
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>

// WiFi Credentials
char ssid[] = "onkar";
char pass[] = "onkar123";

// DHT Settings
#define DHTPIN 4
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

// Pins
const int ledPin = 2;
const int relayPin = 5;
const int ldrPin = 34;
const int potPin = 35;
const int trigPin = 18;
const int echoPin = 19;
const int buzzerPin = 15;

// Variables
float temperature;
float humidity;

long duration;
float distance;

int ldrValue;
int potValue;

int ldrGauge;
int potGauge;

// Blynk Timer
BlynkTimer timer;

// Function to Read All Sensors
void sendSensorData()
{
  // =========================
  // DHT11 Sensor
  // =========================

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

  // Temperature Control
  if (temperature > 34)
  {
    digitalWrite(ledPin, HIGH);
  }
  else
  {
    digitalWrite(ledPin, LOW);
  }

  // Humidity Control
  if (humidity > 50)
  {
    digitalWrite(relayPin, HIGH);
  }
  else
  {
    digitalWrite(relayPin, LOW);
  }

  // =========================
  // LDR Sensor
  // =========================

  ldrValue = analogRead(ldrPin);

  // Light increases → Gauge increases
  ldrGauge = map(ldrValue, 0, 4095, 0, 100);

  // =========================
  // Potentiometer
  // =========================

  potValue = analogRead(potPin);

  // Pot increases → Gauge decreases
  potGauge = map(potValue, 0, 4095, 100, 0);

  // =========================
  // Ultrasonic Sensor
  // =========================

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);

  distance = duration * 0.034 / 2;

  // =========================
  // Buzzer Control
  // =========================

  if (distance > 300)
  {
    digitalWrite(buzzerPin, HIGH);
  }
  else
  {
    digitalWrite(buzzerPin, LOW);
  }

  // =========================
  // Send Data to Blynk
  // =========================

  Blynk.virtualWrite(V0, temperature);
  Blynk.virtualWrite(V1, humidity);
  Blynk.virtualWrite(V2, ldrGauge);
  Blynk.virtualWrite(V3, potGauge);
  Blynk.virtualWrite(V4, distance);

  // Device Status LEDs
  Blynk.virtualWrite(V5, digitalRead(ledPin));
  Blynk.virtualWrite(V6, digitalRead(relayPin));
  Blynk.virtualWrite(V7, digitalRead(buzzerPin));

  // =========================
  // Serial Monitor
  // =========================

  Serial.println("========== SENSOR DATA ==========");

  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("LDR Gauge: ");
  Serial.print(ldrGauge);
  Serial.println(" %");

  Serial.print("Potentiometer Value: ");
  Serial.println(potValue);

  Serial.print("Pot Gauge: ");
  Serial.print(potGauge);
  Serial.println(" %");

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  Serial.println("=================================");
}

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

  // Start DHT
  dht.begin();

  // Pin Modes
  pinMode(ledPin, OUTPUT);
  pinMode(relayPin, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);

  // Initial States
  digitalWrite(ledPin, LOW);
  digitalWrite(relayPin, LOW);
  digitalWrite(buzzerPin, LOW);

  // Connect to Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  // Send data every 2 seconds
  timer.setInterval(2000L, sendSensorData);
}

void loop()
{
  Blynk.run();
  timer.run();
}