#include<WiFi.h>
#include<ThingSpeak.h>
char ssid[]="Wokwi-GUEST";// default user name for wifi
char pass[]="";
WiFiClient client;
unsigned long myChannelNumber = 2231178;
const char * myWriteAPIKey = "44G9HY60Q65XRSWC";
int statuscode;
const int TRIG_PIN = 5; // Trigger Pin of Ultrasonic Sensor
const int ECHO_PIN = 18; // Echo Pin of Ultrasonic Sensor
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  WiFi.mode(WIFI_STA); //connect to wifi simulator
  ThingSpeak.begin(client);  // connect to thingspeak
}

void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration=pulseIn(ECHO_PIN, HIGH);
  float distance=duration*0.0343/2;

  Serial.print("DISTANCE:  ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(500);
if(WiFi.status() != WL_CONNECTED)
    {
      Serial.println("Attempting to Connect");
      while(WiFi.status() != WL_CONNECTED)
      {
        WiFi.begin(ssid,pass);
        Serial.print(".");
        delay(5000);
      }
      Serial.println("\nConnected");
    }
  ThingSpeak.setField(1, distance);
  statuscode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if(statuscode == 200) //200 indicates success update
  {
     Serial.println("Channel Update Successful");
  }
  else
  {
    Serial.println("Problem in writing Data:" + String(statuscode));
  }
  delay(15000);
}