#include<DHTesp.h>
#include <WiFi.h>
#include <ThingSpeak.h>
WiFiClient client;
long myChannelNumber =   2618739;
const char * myWriteAPIKey = "VW5RYCR560UBQL36";
 int statusCode;
 int trig=13;
 int echo=12;
 float d;

 char ssid[] = "Wokwi-GUEST";
char pass[] = "";
   
  DHTesp hari;
  TempAndHumidity data;


 void setup() {
  // put your setup code here, to run once:
  ThingSpeak.begin(client);
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);

  hari.setup(18,DHTesp::DHT22);
  Serial.println("Hello, ESP32!");
  pinMode(echo, INPUT);
  pinMode(trig, OUTPUT);
  pinMode(27, OUTPUT);
  pinMode(14, OUTPUT);
  pinMode(17, OUTPUT);
}
 int ultrasonic(){
  digitalWrite(trig, LOW);
  delay(10);
  digitalWrite(trig, HIGH);
  delay(100);
  digitalWrite(trig, LOW);
  d=pulseIn(echo,HIGH);
  return(d*0.034/2);
  delay(1000);
   
   }

void loop() {

  data = hari.getTempAndHumidity();

  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.");
  }
  Serial.println("humi :" + String(data.humidity));
  Serial.println(("temp :" + String(data.humidity)));
  Serial.print("-------------");
  delay(1000);
  
 int distance=ultrasonic();
 Serial.println(String(ultrasonic()));
 Serial.println("distance:" + String(distance));
 Serial.println("--------------");
 delay(1000);

 if(distance<200){
  digitalWrite(14, HIGH);
  digitalWrite(27, LOW);
  tone(17,7000);
 }
 else
  {
 digitalWrite(27, HIGH);
 digitalWrite(14, LOW);
 tone(17,5000);
  }
  ThingSpeak.setField(1, data.temperature);
   ThingSpeak.setField(2, data.humidity);
    ThingSpeak.setField(3, ultrasonic());

  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));
}
  
}