#include <DHT.h>
#include <ESP32Servo.h>
#include <WiFi.h>
#include <ThingSpeak.h>

#define DHT_SENSOR_PIN 2
#define DHT_SENSOR_TYPE DHT22
#define LDR_SENSOR_PIN 35
DHT dht_sensor(2, DHT22);
const float gama = 0.7;
const float rl10 = 50;
Servo myservo;
const int servoPin = 32;
int position=0;
int piezo=33;

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* server="api.thingspeak.com";

WiFiClient client;

unsigned long myChannelNumber = 1;
const char * myWriteAPIKey = "T02ZNNXGSW9MH8TV";

void setup() {
 
  Serial.begin(115200);
  Serial.println(F("DHTxx test!"));
  dht_sensor.begin();
  myservo.attach(32);
  pinMode(piezo,OUTPUT);
  
  WiFi.mode(WIFI_STA);   
  
  ThingSpeak.begin(client);
}

void loop() {
  if(WiFi.status() !=WL_CONNECTED){
    Serial.print("Attempting to connect");
    while(WiFi.status() !=WL_CONNECTED){
      WiFi.begin(ssid,password);
      delay(5000);
    }
    Serial.println("\nConnected");
  }

  float h=dht_sensor.readHumidity(); 
  float t=dht_sensor.readTemperature();

  int LDR = analogRead(LDR_SENSOR_PIN);
  LDR = map(LDR, 4095, 0, 1024, 0); 
  float voltage = LDR / 1024.*5;
  float resistance = 2000 * voltage / (1-voltage/5);
  float lux = pow(rl10*1e3*pow(10,gama)/resistance,(1/gama));
  Serial.print("Luminesensce = ");
  Serial.println(lux);

  if (isnan(h) || isnan(t)) {
    Serial.println(F("No reading from DHT sensor!!!"));
  }
  else{
    Serial.print("Humidity: ");
    Serial.print(h);
    Serial.print("%");

    Serial.print("  |  ");

    Serial.print("Temperature: ");
    Serial.print(t);
    Serial.print("°C    \n");
  }

  ThingSpeak.setField(1,t);
  ThingSpeak.setField(2,h);
  ThingSpeak.setField(3,lux);

  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  if ((t>25)||(h<90)){
    myservo.write(0);
    delay(1000);
  }
  else if (lux>600){
    myservo.write(0);
    delay(1000);
   }
  else if ((t<25)||(h>90)){
    myservo.write(90);
    digitalWrite(piezo, HIGH);
    delay(1000);
    digitalWrite(piezo, LOW);
    delay(1000);
  }
  else if (lux<600){
    myservo.write(90);
    digitalWrite(piezo, HIGH);
    delay(1000);
    digitalWrite(piezo, LOW);
    delay(1000);
  }
 
}