#define BLYNK_TEMPLATE_ID "TMPL6mL6jxXFl"
#define BLYNK_TEMPLATE_NAME "WOKWI Blynk"
#define BLYNK_AUTH_TOKEN "EFdiwFYXWY4eHVPs_9syu4SORZ6ObR2p"

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>

// Name of the router and password
const char* ssid = "Wokwi-GUEST";
const char* password = "";

const int led = 14;

const int trigPin = 19;
const int echoPin = 18;

#define DHTPIN 4     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701

long duration;
float distanceCm;
float distanceInch;

DHT dht(DHTPIN, DHTTYPE);

// BlynkTimer initialize 
BlynkTimer timer;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  dht.begin();

  pinMode(led, OUTPUT);
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input

  // Start wifi - 2 parameters (ssid & password)
 WiFi.begin(ssid, password);
  Serial.println("Connecting to WiFi");

  // Connection status
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  // Connection Info
  Serial.println("");
  Serial.println("WiFi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  // 3 parameters - Token, ssid, password 
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, password);
  // 2 parameters - 1. time (L = ms) , 2. Method_Name
  timer.setInterval(1000L, DistanceData);
}
void DistanceData() {
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance
  distanceCm = duration * SOUND_SPEED/2;
  
  // Convert to inches
  distanceInch = distanceCm * CM_TO_INCH;
  
  // Prints the distance in the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);

  // Write Distance Data into Blynk 
  // 2 parameters - 1. pin #, 2. Value 
  Blynk.virtualWrite(V1, distanceCm);
}
 // From Blynk to Wowki we need to write the LED status
// to write we always use this method (Blynk method)
BLYNK_WRITE(V0) {
  // get the status of the virtual switch V0
  int status = param.asInt();
  digitalWrite(led, status);
}

void DHTData(){

// Wait a few seconds between measurements.
  delay(2000);

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));

  Blynk.virtualWrite(V2, h);

}


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