#include <DHTesp.h>
#include <WiFi.h>
#include <ThingSpeak.h>
WiFiClient client;
long myChannelNumber =  2616859;
const char * myWriteAPIKey = "TFZLKXQ2DKEF8MJL";
int statusCode;


DHTesp rs;
TempAndHumidity data;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
int trig=27;
int echo=25;
float d;

 
  void setup() {
    
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, pass);
 rs.setup(18,DHTesp::DHT22);
  pinMode(23, OUTPUT);
  pinMode(17, OUTPUT);
  pinMode(trig, OUTPUT);
  pinMode(echo, OUTPUT);
  ThingSpeak.begin(client);
  
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

  

int ultrasonic(){

digitalWrite(trig,LOW);
delay(10);

digitalWrite(trig, HIGH);
delay(100);
digitalWrite(trig, LOW);
d=pulseIn(echo,HIGH);
return(d*0.034/2)+1;
delay(1000);
d=pulseIn(echo,LOW);
tone(23,2000);
}


  

void loop()
 {


  if(WiFi.status() != WL_CONNECTED)
  
  {
    Serial.print("Attempting to connect");
    while(WiFi.status() != WL_CONNECTED)
   {
     Serial.print(".");
     WiFi.begin(ssid,pass);
    delay(5000);
   }

    data=rs.getTempAndHumidity();
  Serial.println("Humi:  "+String(data.humidity));
  Serial.println("Temp:  "+String(data.temperature));
  Serial.println("----------------");
  Serial.println("dist:  "+String(ultrasonic()));
   Serial.println("\nConnected.");


   
   if(ultrasonic()>200 && ultrasonic()<500)

  if((data.humidity>20 && data.humidity<70)&&(data.temperature>30 && data.temperature<70))
   
    digitalWrite(17, HIGH);
  d=pulseIn(echo,HIGH);
   tone(23,2000);
   delay(5000);
    noTone(23);
   digitalWrite(17, LOW);


   
  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));
}
  delay(10); 
}
 }