#include <ArduinoJson.h>
#include <DHT.h>
#include <ESP32Servo.h>

#define DHTPIN 21            // For temperature and humidity sensor
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

const int TRIG_PIN_L = 26;   // for ultrasonic sensor on left side
const int ECHO_PIN_L = 34; 

const int TRIG_PIN_R = 17;   // for ultrasonic sensor on left side
const int ECHO_PIN_R = 18; 

float duration_us_L, dist_L;
float duration_us_R, dist_R;
float t;

int ldr_data;
int led = 27;
int fan = 16;
Servo s;                   //for servo


void setup() {
  Serial.begin(9600);
  dht.begin();
  pinMode(TRIG_PIN_R, OUTPUT); 
  pinMode(ECHO_PIN_R, INPUT);  
  pinMode(TRIG_PIN_L, OUTPUT); 
  pinMode(ECHO_PIN_L, INPUT);   
  pinMode(19, INPUT);
  pinMode(led, OUTPUT);
  pinMode(fan, OUTPUT);

  s.attach(12);
  
}

void loop() {
  ultrasonic_R();         
  ultrasonic_L();
  Servo();
  
  if (dist_R < 300 || dist_L < 300) {
    temp();
    if (t > 22) {
      LDR();
      if (ldr_data == 1) {
        digitalWrite(led, LOW);
        digitalWrite(fan, HIGH);
      } else if (ldr_data == 0) {
        digitalWrite(led, HIGH);
        digitalWrite(fan, HIGH);
      }
    } else if (t <= 22) {
      LDR();
      if (ldr_data == 1) {
        digitalWrite(led, LOW);
        digitalWrite(fan, LOW);
      } else if (ldr_data == 0) {
        digitalWrite(led, HIGH);
        digitalWrite(fan, LOW);
      }
    }
  } else {
    digitalWrite(led, LOW);
    digitalWrite(fan, LOW);
  }
}

void ultrasonic_R() {
  digitalWrite(TRIG_PIN_R, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN_R, LOW);
  duration_us_R = pulseIn(ECHO_PIN_R, HIGH);
  dist_R = 0.017 * duration_us_R;
  Serial.print("OBJECT DETECTED_R : ");
  Serial.print(dist_R);
  Serial.println(" cm");
}

void ultrasonic_L() {
  digitalWrite(TRIG_PIN_L, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN_L, LOW);
  duration_us_L = pulseIn(ECHO_PIN_L, HIGH);
  dist_L = 0.017 * duration_us_L;
  Serial.print("OBJECT DETECTED_L : ");
  Serial.print(dist_L);
  Serial.println(" cm");
}

void Servo() {
  for (int i = 0; i <= 90; i++) {
    s.write(i);
    delay(10);
  }
  for (int j = 90; j >= 0; j--) {
    s.write(j);
    delay(10);
  }
}

void LDR() {
  ldr_data = digitalRead(19);
  Serial.println(ldr_data);
}

void temp() {
  float h = dht.readHumidity();
  t = dht.readTemperature();
  Serial.print("HUMIDITY = ");
  Serial.print(h);
  Serial.print("%\tTEMPERATURE = ");
  Serial.print(t);
  Serial.println(" °C");
}