#include <WiFi.h>
#include <ThingSpeak.h>
#include "DHTesp.h"
int trigger_pin=13;
int echo_pin=12;
DHTesp dhtSensor;
TempAndHumidity data;

const int DHT_PIN = 15; //always use 15
char ssid[] = "Wokwi-GUEST";  //used to access the internet(wifi)- username
char pass[] = "";      //used to access the internet(wifi)- password
WiFiClient client;
unsigned long myChannelNumber =   2416181; // ThingSpeak Channel ID
const char * myWriteAPIKey = "13EDEQFI8HN0AJGK"; //ThingSpeak my write API key

int statusCode;
long wdistance(){     //long is an alternative word for int. used for safety purpose
 digitalWrite(13,LOW);
 delay(10);
 digitalWrite(13,HIGH);
 delay(100);
 digitalWrite(13,LOW);
 float d=pulseIn(12,HIGH);     //d used for calculating a distance
 return(d*0.034/2)+1;    //'+1' used to calculate the accurate data

 delay(1000);
}
void setup() 
{
Serial.begin(115200);
  pinMode(12, INPUT);
  pinMode(13, OUTPUT);
  pinMode(4, OUTPUT);
WiFi.mode(WIFI_STA); 
ThingSpeak.begin(client);
dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
}

void loop() 
{
  int c=wdistance();
  Serial.println(String(c));
  if(c>=200){
  digitalWrite(4, HIGH);
  Serial.println("detected");
  }
  else{
  digitalWrite(4,LOW);
 Serial.println("not Detected");
  }

data = dhtSensor.getTempAndHumidity();
Serial.println("Humi: " + String(data.humidity, 1));
Serial.println("Temp: " + String(data.temperature, 2));

Serial.println("-----------");


 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.");
  }     

//Below three lines for ThingSpeak
ThingSpeak.setField(1, data.humidity);
ThingSpeak.setField(2, data.temperature);
ThingSpeak.setField(3, c);
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));
}
 
//sendDataToScript(data.humidity, data.temperature);
delay(15000);
}