#include <WiFi.h>
//wifi connection
const char *ssid = "Wokwi-GUEST";
const char *pass = "";


//wifi declaration
WiFiClient espClient;


//pin cofiguration
const int rxpin = 26; //echopin
const int txpin = 25;//trig



//wifi conn
void wificonn(){
  //connecting to wifi network
  WiFi.begin(ssid, pass);
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("connecting to WiFi..");
  }
  Serial.println("connected to WiFi");
}

void setup(){
  //initialize serial communication
  Serial.begin(9600);
  

  //configure pin modes
  pinMode(txpin, OUTPUT);
  pinMode(rxpin, INPUT);
  

}


void loop(){
  // send a 10 microseconds pulse to trigger pin
  digitalWrite(txpin, LOW);
  delayMicroseconds(2);
  digitalWrite(txpin, HIGH);
  delayMicroseconds(10);
  digitalWrite(txpin, LOW);

  //measure the duration of the echo pulse
  long duration = pulseIn(rxpin, HIGH);
  /*Introduction to C++ long. In C++, 
  long is a data type for a constant or variable which has the capability 
  of storing the variable or constant values with 64-bits storage 
  and is signed integer data type which is used for storing variable or 
  constants with larger values larger than standard integer 32-bit data type*/

  // Calculate distance (speed of sound = 340 m/s or 0.034 cm/µs)
  // Divided by 2 because the signal travels to the object and back

  float distance = (duration * 0.034) / 2;

  //diplay in serial monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(1000);


}