#include <DHTesp.h>
#include <WiFi.h>
#include <ThingSpeak.h>
WiFiClient client;
long myChannelNumber =   2618743;
const char * myWriteAPIKey = "P8OXWSOFAZB9AR2F";
int statusCode;
int trig=25;
int echo=26;
float d;

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

DHTesp srk;
TempAndHumidity data;

void setup() {
 
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);

  srk.setup(18, DHTesp::DHT22);
  Serial.println("Hello, ESP32!");
  pinMode(echo, INPUT);
  pinMode(trig, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(14, OUTPUT);
  pinMode(15, OUTPUT);
  ThingSpeak.begin(client);

}

int ultrasonic(){
  digitalWrite(trig, LOW);
  delay(100);
  digitalWrite(trig, HIGH);
  delay(100);
  digitalWrite(trig, LOW);
  d=pulseIn(echo,HIGH);
  return(d*0.034/2);
  delay(1000);
}
void loop() {
  // put your main code here, to run repeatedly:
  // this speeds up the simulation
  data = srk.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.print("------------");
   delay(1000);
   
   if(distance<200) {
    digitalWrite(12, HIGH);
    digitalWrite(14, LOW);
    tone(23,3000);
  } 
  else
  {
   digitalWrite(14, HIGH);
   digitalWrite(12, LOW);
   tone(23,6000);
   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));
}
  }

}