#include <WiFi.h>
#include <ThingSpeak.h>
const int trigPin=5;
const int echoPin =18;
const int ledPin =15;
char ssid[]="Wokwi-GUEST";
char pass[] ="";
WiFiClient client;
unsigned long myChannelNumber=3019486;
const char* myWriteAPIKey="Y5P86V8DGIE4HH3K";
void setup() {
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
}
void loop() {
  if(WiFi.status()!=WL_CONNECTED){
    Serial.print("attemmpting to coonect to Wi-fi");
    while(WiFi.status()!=WL_CONNECTED)
    {
      WiFi.begin(ssid,pass);
      delay(500);
    }
    Serial.println("Connected.");
  }
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  long duration=pulseIn(echoPin,HIGH);
  float distance=duration*0.034/2;
  if(distance<100)
  {
    digitalWrite(ledPin, HIGH);
  }
  else
  {
    digitalWrite(ledPin, LOW);
  }
  ThingSpeak.setField(1,distance);
  int statusCode=ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);
  if(statusCode==200)
  {
    Serial.print("Channel update successful.");
  }
else
{
  Serial.println("Problem updated channel.HTTP error code"+ String(statusCode));
  }
delay(500);
}