#include <WiFi.h>
#include <ThingSpeak.h>

char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber =2581062;
const char * myWriteAPIKey = "SDT2ITZADGY41Q4J";
int statusCode;

void setup() {
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  pinMode(14, OUTPUT);
  pinMode(13, INPUT);
}
  void loop() {
   
   if(WiFi.status() != WL_CONNECTED)
  {
  Serial.print("Attempting to WiFi connect");
    while(WiFi.status() != WL_CONNECTED)
    {
    WiFi.begin(ssid, pass); 
    Serial.print(".");
    delay(5000);
    }
  Serial.println("\nWiFiConnected.");
  }

  digitalWrite(14, HIGH);
  delay(100);
  digitalWrite(14, LOW);
  float duration = pulseIn(13, HIGH);
  long d=(duration*0.034/2);
  Serial.println(d);
  delay(10); 
  
  ThingSpeak.setField(2, d);
  
  statusCode = ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);
  if(statusCode == 200) { 
Serial.println("Channel update successful.");
}
else {
Serial.println("Problem Writing data. HTTP error code :" +
String(statusCode));
}
  delay(15000);
}