/**in Blynk work with Distance device to  turn on 
and of LED and Distance sensor **/

//#define BLYNK_TEMPLATE_NAME "FirstLEDBlink"
//#define BLYNK_AUTH_TOKEN "85exgL7mVAscFviHlqQ5xTpfZpGWLFtJ"

//blynk code
#define BLYNK_TEMPLATE_ID "TMPL6Kgj2cRz2"
//#define BLYNK_TEMPLATE_NAME "FirstLEDBlink"
//#define BLYNK_AUTH_TOKEN "uznx4kiaXI2wlma9RwER0ZYhKYm1nU22"
#define BLYNK_TEMPLATE_NAME "FirstLEDBlink"
#define BLYNK_AUTH_TOKEN "85exgL7mVAscFviHlqQ5xTpfZpGWLFtJ"

#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 = 16;
const int echoPin = 17;

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