#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

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

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 parameter - Token, ssid, password
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, password);
  
  //2 parameter- 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 parameter - 1.pin, 2.Value
  Blynk.virtualWrite(V1, distanceCm);
}

//From Blynk to Wokwi we need to write the LED status
//to write we always use this method
BLYNK_WRITE(V0){
  //get the status of the virtual switch V0
  int status = param.asInt();
  digitalWrite(led, status);

}

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

  
  //delay(1000);
}