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

DHTesp dhtSensor;
TempAndHumidity  data;
const int DHT_PIN = 15;

char ssid[] = "Wokwi-GUEST";   // your network SSID (name) 
char pass[] = "";   // your network password          // your network key Index number (needed only for WEP)
WiFiClient  client;
unsigned long myChannelNumber = 1877623;
const char * myWriteAPIKey = "421WKSTNF3THGVPB";

const int trig = 32;
const int echo = 33;

long duration;
float distance;

int statusCode;
const int RELAY_PIN = 4;

void setup()
 {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(RELAY_PIN,OUTPUT);
  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);

if(distance < 50)
{
 digitalWrite(RELAY_PIN, HIGH);
 Serial.println("Needed");
}
 else
 {
 digitalWrite(RELAY_PIN, LOW);
 Serial.println("Not Needed");
 }

if(WiFi.status() != WL_CONNECTED)
  {
    Serial.print("Attempting to connect");
    while(WiFi.status() != WL_CONNECTED)
    {
      WiFi.begin(ssid, pass); // Connect to WPA/WPA2 network. Change this  line if using open or WEP network
      Serial.print(".");
      delay(5000);     
    } 
    Serial.println("\nConnected.");
  }

  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  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); 

}