#include <WiFi.h>
#include <ThingSpeak.h>
//wifi setup line
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber = 2446519;
const char * myWriteAPIKey = "93K504N5N6PQMICH";
int statusCode;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  //
  //wifi mode setup
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

  pinMode(2, OUTPUT);
  pinMode(4, INPUT);
}

void loop() {
  //wifi connection setup
   if(WiFi.status() != WL_CONNECTED)
  {
  Serial.print("Attempting to connect");
    while(WiFi.status() != WL_CONNECTED)
    {
    WiFi.begin(ssid, pass); 
    Serial.print(".");
    delay(2000);
    }
  Serial.println("\nConnected.");
  }
  digitalWrite(2, HIGH);
  delay(1000);
  digitalWrite(2, LOW); 
  float a=pulseIn(4,HIGH);
  long distance=(a*0.034)/2;
  Serial.println("Object distance is "+ String(distance));
   ThingSpeak.setField(1,distance);
  statusCode = ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);
  if(statusCode == 200) { //successful writing code
Serial.println("Channel update successful.");
}
else {
Serial.println("Problem Writing data. HTTP error code :" +
String(statusCode));
}
  delay(2000);

}