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

DHTesp dht;
TempAndHumidity data;

//Thingspeak connectivity variable Declaration
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber = 2621822;
const char * myWriteAPIKey = "X9AXTXZ8MJR1FC48";
int statusCode;

void setup() {
   //wifi and thingspeak mode setup
   WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

  Serial.begin(115200);
  dht.setup(27,DHTesp::DHT22);
  // for ultrasonic sensor
  pinMode(19, OUTPUT); //for trigger
  pinMode(18, INPUT); //for echo
}

void loop() {
  //wifi connection setup
   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.");
  }


  // For DHT Sensor
  data = dht.getTempAndHumidity();
  Serial.println("Temperature");
  Serial.println(data.temperature);
  Serial.println("Humidity");
  Serial.println(data.humidity);
  delay(3000); 

// For connecting ultrasonic
  //Connecting the TRIG PIN
  digitalWrite(19, HIGH);
  delay(100); 
  digitalWrite(19, LOW);

  //Connecting and reading the ECHO PIN
   float duration = pulseIn(18,HIGH);
   int distance = duration*0.034/2 ; //Formula for calculating the distance
   Serial.println(distance);//Printing the distance

    ThingSpeak.setField(1, data.temperature);
    ThingSpeak.setField(2, data.humidity);
    ThingSpeak.setField(3, distance);

  //Thingspeak response
  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);
}