#define BLYNK_TEMPLATE_ID "TMPL6PanQTJbt"
#define BLYNK_TEMPLATE_NAME "esp32"
#define BLYNK_AUTH_TOKEN "bnNHxu7_0lBp_gPvXXzLngyP_9m1Z7gk"

#include <BlynkSimpleEsp32.h>
#include "DHTesp.h"

#define BLYNK_PRINT Serial

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

#define DHT_PIN 15
#define trigPin 27
#define echoPin 26
#define ldrPin 32

DHTesp dhtSensor;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  Blynk.begin(auth, ssid, pass);

  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ldrPin, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int humidity, temperature;
  tempNhum(humidity,temperature);
  Serial.println(humidity);
  Serial.println(temperature);

  int distance;
  dist(distance);
  Serial.println(distance);

  int lux;
  light(lux);
  Serial.println(lux);

  Blynk.virtualWrite(V0, humidity);
  Blynk.virtualWrite(V1, temperature);
  Blynk.virtualWrite(V2, distance);
  Blynk.virtualWrite(V3, lux);
  
  delay(1000); 

}

void tempNhum(int &humidity, int &temperature){
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();

  if(isnan(data.humidity)||isnan(data.temperature)){
    Serial.println("Failed to read from DHT22!!");
    humidity =-1;
    temperature =-1;
  }else{
    humidity = data.humidity;
    temperature = data.temperature;
  }
}

void dist(int &distance){
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echo pulse duration
  int duration = pulseIn(echoPin, HIGH);

  // Calculate the distance in centimeters
  distance = duration / 58;
}

void light(int &lux){
  // These constants should match the photoresistor's "gamma" and "rl10" attributes
  const float GAMMA = 0.7;
  const float RL10 = 50;

  // Convert the analog value into lux value:
  int analogValue = analogRead(ldrPin);
  float voltage = analogValue / 4095. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
}