//blynk iot auth token , wifi ssid and password
#define BLYNK_TEMPLATE_ID "TMPL3l7hgvV0o"
#define BLYNK_TEMPLATE_NAME "Project"
#define BLYNK_AUTH_TOKEN "2eMU1aQ0T44yecj16aaqSEQN5iPrx8hH"
char ssid[]="Wokwi-GUEST";
char password[]="";

//header files
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>
#include <ESP32Servo.h>

//esp pins naming
#define DHTPIN 4
#define servopin 2
#define ledpin 5
#define tripin 27
#define echopin 26
//dht sensor type
#define DHTTYPE DHT22

//dht and servo sensor object creation 
DHT dht (DHTPIN, DHTTYPE);
Servo servo;

//variables for data store
float temperature;
float humidity;
int duration;
float distance;
void setup() {
  // put your setup code here, to run once:
  //serial communcation setup with 115200 baut  rate
  Serial.begin(115200);

  //blynk connection and wifi connection with auth , ssid, password 
  Blynk.begin(BLYNK_AUTH_TOKEN,ssid,password);

  //different pinmode configuration (defining which is input or output)
  pinMode(ledpin,OUTPUT);
  pinMode(tripin, OUTPUT);
  pinMode(echopin, INPUT);
  //begin dht
  servo.attach(servopin,500,2400);
  dht.begin();
}

void loop() {
  //reading temperature and humidity form dht sensor and displaying on serial monitor
  temperature=dht.readTemperature();
  humidity=dht.readHumidity();
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println("%");

  //finding time duration taked by sound to reach the object
  delayMicroseconds(2);
  digitalWrite(tripin, HIGH);
  delayMicroseconds(10);
  digitalWrite(tripin, LOW);
  duration=pulseIn(echopin,HIGH);
  //find distance of object based on time taken by sound and displaying
  distance=duration*0.034/2;
  Serial.print("distance:");
  Serial.print(distance);
  Serial.println(" cm");
    Serial.println("____________________________________________");
  //delay 1sec
  delay(1000);

  //sending temp , hum , dis into blynk iot app (v1,v2,v3) are virtural pin in blynk
  Blynk.virtualWrite(V1,temperature);
  Blynk.virtualWrite(V2,humidity);
  Blynk.virtualWrite(V4,distance);
  // Blynk server in sync and run background communication between esp and blynk
  Blynk.run();
}

// receiving servo motor position from blynk 
BLYNK_WRITE(V3){
  // received value store in pos variable
  int pos=param.asInt();
  //changing servo position based on pos varibale value
  servo.write(pos);
}
//receiving led state value from blynk
BLYNK_WRITE(V0){
  bool ledstate=param.asInt();
  digitalWrite(ledpin,ledstate);
}