#include <WiFi.h>
#include <ThingSpeak.h>
const int ledPin= 15;
const int trig = 5;
const int echo = 18;
float distance;
long duration;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber = 2112978;
const char * myWriteAPIKey = "RAH1H6ZWEN2YY4MJ";
int statusCode;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  delay(1500);
  pinMode(ledPin, OUTPUT);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
}
long getdistance(){
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  duration = pulseIn(echo, HIGH);
  return(duration*0.034/2);
  Serial.println(duration);
}
void loop() {
   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.");
  }
  if(getdistance()>200)
  {
    analogWrite(ledPin,50);
    ThingSpeak.setField(2, 0);
    Serial.println(0);
  }
  else
  {
    analogWrite(ledPin,255);
    ThingSpeak.setField(2, 1);
    Serial.println(1);
  }
  delay(10); // this speeds up the simulation
  Serial.println(getdistance());
  ThingSpeak.setField(1, getdistance());
  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);
}