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

DHTesp dhtSensor;
TempAndHumidity data;
const int DHT_PIN = 13;

char ssid[] = "Wokwi-GUEST";
char pass[] ="";
WiFiClient client;
unsigned long myChannelNumber =2517094 ;
const char * myWriteAPIkey = "C11FYVGJBPJOBHZE";

const int trig = 27;
const int echo = 25;

long duration;
float distance;

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);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
}

void loop()
{

digitalWrite(trig, LOW);
delayMicroseconds(2);
digitalWrite(trig, HIGH);
delayMicroseconds(10);
digitalWrite(trig,LOW);

duration = pulseIn(echo,HIGH);
//Serial.println(duration);
distance = (duration * 0.034/2);
//Serial.println(distance);

data = dhtSensor.getTempAndHumidity();

if(WiFi.status() != WL_CONNECTED)
  {
    Serial.println("Attempting to connect");
    while(WiFi.status() != WL_CONNECTED)
    {
      WiFi.begin(ssid, pass);
      Serial.print(".");
      delay(5000);
    }
    Serial.println("\nConnected.");
    }
  ThingSpeak.setField(1,data.humidity);
  ThingSpeak.setField(2,data.temperature);
  ThingSpeak.setField(3, distance);
  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);

}