#include <DHT.h>
#include <Servo.h>
#include <TimeLib.h>
#include <Wire.h>
#include <RTClib.h>

#define buttonPin 10
#define dhtPin 9
#define dhtType DHT22
#define ldrPin A2
#define trigPin 8
#define echoPin 7

DHT dht(dhtPin, dhtType);
RTC_DS1307 rtc; //khai bao rtc

//khai bao khoa
Servo servo;
int pos = 0;

bool buttonState = false;

void setup() {
  Serial.begin(9600);
  //khoi dong rtc
  if (!rtc.begin()) {
    Serial.println("Không tìm thấy RTC");
  }
  if (!rtc.isrunning()) {
    Serial.println("RTC không chạy, khởi tạo thời gian ...");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  dht.begin();
  servo.attach(3);
  servo.write(0); //khoá đóng
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  int ldrValue = analogRead(ldrPin);
  float temperature = dht.readTemperature();
  buttonState = digitalRead(buttonPin);

  //doc khoang cach
  long distance = readDistance();

  DateTime now = rtc.now();
  Serial.print("Thời gian: ");
  getTime();

  Serial.print("Ánh sáng: ");
  Serial.println(ldrValue);
  Serial.print("Nhiệt độ: ");
  Serial.println(temperature);
  Serial.print("Khoảng cách: ");
  Serial.println(distance);

  if (buttonState == LOW) {
    // Serial.println(buttonState);
    openLock();
    delay(200);//tránh mở khoá liên tiếp
  }
  //khi du dieu kien anh sang, nhiet do va khoang cach => cua mo
  if (now.hour() >= 8 && now.hour() <= 18) {
    if (ldrValue > 300 && temperature > 25 && distance < 20) {
      openLock();
    }
  }
  delay(3000);
}

void openLock(){
  Serial.print("Khoá mở lúc: ");
  getTime();

  for (pos = 0; pos <= 90; pos +=1) {
    servo.write(pos);
    delay(15);
  }
  delay(5000);// open 5s
  for (pos = 90; pos >= 0; pos -= 1) {
    servo.write(pos);
    delay(15);
  }
}

void getTime() {
  DateTime now = rtc.now();
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.println(now.second(), DEC);
}

long readDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  long duration = pulseIn(echoPin, HIGH);
  long distance = (duration/2)*0.0343;
  
  return distance; //tra ve khoang cach tinh theo cm
}