#include <WiFi.h>
#include <ThingSpeak.h>
#include <stdio.h>
const int trigPin = 12;   //D6
const int echoPin = 14;   //D5

#define SOUND_VELOCITY 0.034
#define CM_TO_INCH 0.393701

long duration;
float distanceCm;
float distanceInch;

char ssid[] = "Wokwi-GUEST";
char pass[] = ""; 
WiFiClient client;
unsigned long myChannelNumber =2775572;
const char * myWriteAPIKey = "NJ67JAQC3E7WNVP6";
int statusCode;
void setup()
{
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT); 
}

void loop()
{
  if (WiFi.status() != WL_CONNECTED)
  {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    while (WiFi.status() != WL_CONNECTED)
    {
      WiFi.begin(ssid, pass);
      Serial.print(".");
      delay(5000);
    }
    Serial.println("\nConnected.");
  } 
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distanceCm = duration * SOUND_VELOCITY/2;
  distanceInch = distanceCm * CM_TO_INCH;
  Serial.print("Distance = ");
  Serial.print(distanceCm);
  Serial.println(" cm");
  delay(10); 
}