#define BLYNK_TEMPLATE_ID "TMPL650TKoGCD"
#define BLYNK_TEMPLATE_NAME "Wokwi Blynk"
#define BLYNK_AUTH_TOKEN "yt-dQA1Id9a4RJmWS4hiSyqSyfHiDejc"

#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701
#define PIN        5  // Pin connected to the WS2812 data line
#define NUMPIXELS 16  // Number of WS2812 LEDs in the strip
#define DHTPIN 12    // DHT 22
#define DHTTYPE DHT22

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <Adafruit_NeoPixel.h>
#include <DHT.h>
#include <DHT_U.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;

long duration;
float distanceCm;
float distanceInch;

// BlynkTimer initialize 
BlynkTimer timer;

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
DHT dht(DHTPIN, DHTTYPE);

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

  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);

  pixels.begin();
  pixels.setBrightness(100);  // reduce brightness to 50%

// Initialize the DHT sensor
  dht.begin();
  // Setup a function to be called every second
  timer.setInterval(1000L, sendSensor);
}

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);
}


// Fill the dots one after the other with a color
void colorWipe(uint32_t color, int wait) {
  for(int i=0; i<NUMPIXELS; i++) {
    pixels.setPixelColor(i, color);
    pixels.show();
    delay(wait);
  }
}

// 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);
}



BLYNK_WRITE(V2) {
  int pinValue = param.asInt(); // Get the value of the virtual pin V2
  if (pinValue == 1) {
   while(1){
    // Turn on WS2812 LEDs (example: set to red color)
    colorWipe((255, 0, 0), 100);  // Red color, 50ms delay
    delay(100);  
    colorWipe(pixels.Color(0, 0, 255), 100);
    delay(100);  
    colorWipe(pixels.Color(0, 255, 0), 100);
    delay(100);  
    colorWipe(pixels.Color(255, 255, 0),100);
    }
  } else {
    // Turn off WS2812 LEDs
    colorWipe(pixels.Color(0, 0, 0), 50);  // Off (black) color, 50ms delay
  }
}

// Function to send DHT22 data to Blynk
void sendSensor() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();

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

  // Print the results to the Serial Monitor
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.println(" *C ");

  // Send the data to Blynk
  Blynk.virtualWrite(V4, t); // Virtual Pin V4 for temperature
  Blynk.virtualWrite(V3, h); // Virtual Pin V3 for humidity
}

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