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

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

WiFiClient client;

unsigned long mychannelnumber= 2247874;
const char * myWriteAPIKey = "FXKRZIE1BT1CAFS6";

const int trig = 13;
const int echo = 12;
int statusCode;

long duration;

long distance;

DHTesp dhtSensor; // Creating a structure object of DHTesp

TempAndHumidity data; // Creating a struct of TempandHumidity

const int DHT_PIN = 15; // In the ESP32 the DHT22 can be connected in only certain pins such as 15,13
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  dhtSensor.setup(DHT_PIN,DHTesp::DHT22); // where second argument is the type of sensor used 

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

}

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("\n Connected...");
  }

  


  Serial.println("-------------------");
  // put your main code here, to run repeatedly:
  data = dhtSensor.getTempAndHumidity(); // returns 2 values which are stored in data structure

  Serial.println("Temperature: " + String(data.temperature,2) +  " °C");
  Serial.println("Humidity: " + String(data.humidity,1)+" %");
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  
  digitalWrite(trig,HIGH);
  delayMicroseconds(10);

  digitalWrite(trig,LOW);

  duration = pulseIn(echo,HIGH);

  //Serial.println("The duration is: " + duration) ;

  distance = (duration *0.034/2)+1;

  Serial.println("Distance is " + String(distance));
  Serial.println("---------------");

  delay(15000);
  
  ThingSpeak.setField(1,data.humidity);
  ThingSpeak.setField(2,data.temperature);
  ThingSpeak.setField(3,distance); 
  statusCode = ThingSpeak.writeFields(mychannelnumber,myWriteAPIKey);
  if(statusCode == 200){
    Serial.println("Channel update successful...");
  }
  else{
    Serial.println("There is a problem .." + String(statusCode));
  }




}