#include <WiFi.h>
#include<ThingSpeak.h>
const int echo=4;
const int trig=2;
float distance;
float duration;
char ssid[]="Wokwi-GUEST";
char pass[]="";
WiFiClient client;
unsigned long myChannelNumber = 2607320;
const char* myWriteAPIKey="QAP296G05XUOSPSB";
int statusCode;
void setup() 
{
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  delay(1000);
}

float getdistance()
{
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  duration=pulseIn(echo,HIGH);
  return {duration*0.034/2};
}


void getwifi()
{
  if(WiFi.status()!=WL_CONNECTED)
  {
     Serial.print("Attempting to connect");
     while(WiFi.status()!=WL_CONNECTED)
    {
      WiFi.begin(ssid,pass);
      Serial.print(".");
      delay(500);
    }
  }
  Serial.println("\nConnected");
}
void loop() 
{
  getwifi();

  distance=getdistance();
  Serial.println("distance:"+String(distance));
  Serial.println("<-------------------->"); 
  
  // this speeds up the simulation
  ThingSpeak.setField(1,distance);
  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(1000);
}