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

// Dht declaration
#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// ultrasonic declaration
const int echo=4;
const int trig=2;
float distance;
float duration;

// wifi declaration 
char ssid[]="Wokwi-GUEST";
char pass[]="";
WiFiClient client;

//Thingspeak declaration
unsigned long myChannelNumber=1982637;
const char* myWriteAPIKey="M05B738RKO2XOPZA";
int statusCode;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  // US
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  // DHT
  dht.begin();

  //WIFI
  WiFi.mode(WIFI_STA);

  //Thingspeak
  ThingSpeak.begin(client);
  delay(1000);
}

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

}

// wifi connecting function 
void getwifi()
{
  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");
}


void loop() 
{
  getwifi();
  distance=getdistance();
   Serial.print("distance = ");
 Serial.println(distance);


float h = dht.readHumidity();
float t = dht.readTemperature();
float f = dht.readTemperature(false);

if(isnan(h)  || isnan(t) || isnan(f))
{Serial.println("failed");
return;
}

else
{
Serial.print("temp= ");
Serial.print(t);
 Serial.println(" degree C ");
 Serial.print("humidity = ");
 Serial.print(h);
 Serial.println(" % ");
 Serial.println(" ");
 delay(2000);
}

  // Data uploading
  ThingSpeak.setField(1,h);
  ThingSpeak.setField(2,t);
  ThingSpeak.setField(3,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(15000);
}