//wifi and thingspeak library include
#include <WiFi.h>
#include <ThingSpeak.h>

// Thingspeak connectivity variable Declaration
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber =  2621747;
const char * myWriteAPIKey = "6AX1O3YSVVP558OT";
int statusCode;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  //wifi and thingspeak mode setup
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

  pinMode(14, OUTPUT);
  pinMode(26, 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(5000);
    }
  Serial.println("\nConnected.");
  }

  digitalWrite(14, HIGH);
  delay(100);
  digitalWrite(14, LOW);
  float duration = pulseIn(26,HIGH);
  int distance = duration*0.034/2;
  Serial.println(distance);


  ThingSpeak.setField(1, distance);

  //Thingspeak response
  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(15000);
}