#define BLYNK_TEMPLATE_ID "TMPL61WVWeKzb"
#define BLYNK_TEMPLATE_NAME "IoT Assesment"
#define BLYNK_AUTH_TOKEN "CW6_vPbSnanNFlEvVF5jYHtEuMUiY-aG"
#define BLYNK_PRINT Serial

#include "DHT.h"
#include <BlynkSimpleEsp32.h>
#include <WiFi.h>
#include <WiFiClient.h>

#define DHTPIN 33     
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);
BlynkTimer Timer;

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

float temperature;
float humidity;

int enable_system;

int buzzer = 25;
int enable_led = 26;
int alert_led = 27;

BLYNK_WRITE(V2){
  int i = param.asInt();
  enable_system = i;
}

void system_function(){
  //Constantly read DHT value for 1 seconds
  for(int i = 0; i < 1000; i++){

    //Read temperature from DHT sensor
    temperature = dht.readTemperature();
    humidity = dht.readHumidity();

    //If enable system switch in Blynk is turned on
    if(enable_system == 1){

      //Turned green LED on
      digitalWrite(enable_led, HIGH);
      
      //If temperature is more than 50 and humidity is less than 40 (HOT AND DRY)
      if(temperature > 50 && humidity < 40){
        //Trigger red LED and buzzer
        digitalWrite(alert_led, HIGH);
        tone(buzzer, 1000);
      }else{
        //If not, reset red LED and buzzer
        digitalWrite(alert_led, LOW);
        tone(buzzer, 0);
      }
    }else{
      //If enable system switch in Blynk is not enabled, disable all LED and buzzer
      digitalWrite(enable_led, LOW);
      digitalWrite(alert_led, LOW);
      tone(buzzer, 0);
    }
    delay(1);
  }

  //Update temperature and humidity value after 1 second to prevent heavy load on Blynk server
  Blynk.virtualWrite(V0, temperature);
  Blynk.virtualWrite(V1, humidity);
}

void setup() {
  Serial.begin(115200);

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  pinMode(enable_led, OUTPUT);
  pinMode(alert_led, OUTPUT);
  
  digitalWrite(alert_led, LOW);

  pinMode(buzzer, OUTPUT);
  tone(buzzer, 0);

  Blynk.virtualWrite(V2, 0);

  dht.begin();
  Timer.setInterval(1L, system_function);
}

void loop() {
  Blynk.run();
  Timer.run();
  delay(10);
}