#include <WiFi.h>
#include "ThingSpeak.h"
const int trig = 14;
const int echo = 12;
float distance ;
float duration;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient Client;
unsigned long mychannel_number = 2641269;
const char* WriteKey = "Y32C416CAECFKOON";
int statusCode;
void setup() 
{
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(Client);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
}
void getwifi()
{
  if(WiFi.status()!= WL_CONNECTED)
  {
    Serial.println("attemping to connect");
    while(WiFi.status()!= WL_CONNECTED)
    {
      WiFi.begin(ssid,pass);
      Serial.println(".");
      delay(6000);
    }
  }
  Serial.println("\n connected");
}
float getdistance() 
{
  digitalWrite(trig, LOW);
  delayMicroseconds(4);
  digitalWrite(trig, HIGH);
  delayMicroseconds(100);
  digitalWrite(trig, LOW);
  duration = pulseIn(echo,HIGH);
  return(duration*0.034/2);
}
void loop()
{ 
  getwifi();
  ThingSpeak.setField(1,distance);
  statusCode = ThingSpeak.writeFields(mychannel_number,WriteKey);
  if(statusCode == 200)
  {
    Serial.println("the channel updated");
  }
  else
  {
    Serial.println("error"+String(statusCode));
  }
  distance = getdistance();
  Serial.println("distance "+String(distance));
  delay(15000);
}