#include <WiFi.h>
char  ssid[]="Wokwi-GUEST";
char pass[]="";
WiFiClient client;
#include <ThingSpeak.h>
unsigned long myChannelNumber= 2633377;
const char * myWriteAPIKey="4I7Y7ZL9Z1RTIQBC";
int statusCode;
int trig = 12;
int echo = 13;
int distance;

void setup()
 {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
   WiFi.mode(WIFI_STA);
   ThingSpeak.begin(client);
}
void loop()
 {
  if (WiFi.status()!=WL_CONNECTED)
  {
   
    Serial.print("Attempting to connect");
    while(WiFi.status ()!=WL_CONNECTED)
    {
      WiFi.begin(ssid,pass);
      Serial.print(".");
      delay(3000);
    }
    Serial.println("\n connected");

       
     
  {    
   Serial.println("\n connected");
  digitalWrite(trig, HIGH);
  delay(100);
  digitalWrite(trig, LOW);
  int reading =(pulseIn(echo,HIGH));
  distance = (reading*0.034/2);
  Serial.println(distance);
  Serial.println("ok. recived");
  delay(1000);
  ThingSpeak.setField(1,distance);
  statusCode=ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);
  if(statusCode == 200)
    {
    Serial.println("channel updated success");
  }
  else
  {
    Serial.println("Problem writing data http error code :"+
    String(statusCode));

 delay(1000);
  }
  }}}