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

char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber = 2236553;
const char * myWriteAPIKey = "Y8ST265ZG0GGZVTN";
int statusCode;

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

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);


  pinMode(12, OUTPUT);
  pinMode(14, INPUT);
  pinMode(27, OUTPUT);
}
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(12, HIGH);
  delay(100); // this speeds up the simulation
  digitalWrite(12, LOW);
  float a=pulseIn(14,HIGH);
  long d = (a*0.034) / 2;
  Serial.println(d);// put your main code here, to run repeatedly:
 ThingSpeak.setField(1, d);
  if(d<200)
  {
    digitalWrite(27, HIGH);
    ThingSpeak.setField(1, d);
  }
  else
  {
    digitalWrite(27, LOW);
    ThingSpeak.setField(2, 0);
  }
  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);
}