#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
#include <DHT.h>

// การตั้งค่าขาเชื่อมต่อ
#define DHTPIN 19
#define DHTTYPE DHT22
#define TRIG_PIN 5
#define ECHO_PIN 4
#define PIR_PIN 15
#define LED_PIN 27    // เพิ่มขา LED
#define RELAY1 12
#define RELAY2 13
#define RELAY3 14

LiquidCrystal_I2C lcd(0x27, 20, 4);
RTC_DS1307 rtc;
DHT dht(DHTPIN, DHTTYPE);

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

  pinMode(RELAY1, OUTPUT);
  pinMode(RELAY2, OUTPUT);
  pinMode(RELAY3, OUTPUT);
  pinMode(LED_PIN, OUTPUT); // ตั้งค่าขา LED เป็น Output
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(PIR_PIN, INPUT);

  lcd.init();
  lcd.backlight();

  if (!rtc.begin()) {
    while (1);
  }
  dht.begin();
}

void loop() {
  // --- 1. อ่านค่าจาก Sensor ต่างๆ ---
  DateTime now = rtc.now();
  
  // วัดระยะทาง HC-SR04
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  long duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;

  // อ่านค่า DHT22
  float hum = dht.readHumidity();
  float temp = dht.readTemperature();

  // อ่านค่า PIR (Motion)
  int motion = digitalRead(PIR_PIN);

  // --- 2. ตรรกะการควบคุม ---
  
  // LED: Motion Control (ตรวจจับความเคลื่อนไหว)
  if (motion == HIGH) {
    digitalWrite(LED_PIN, HIGH); // LED ติด
  } else {
    digitalWrite(LED_PIN, LOW);  // LED ดับ
  }

  // Relay 1 & 2: Temp/Hum Control
  if (temp > 30.0) digitalWrite(RELAY1, HIGH);
  else if (temp < 30.0) digitalWrite(RELAY1, LOW);

  if (hum < 50.0) digitalWrite(RELAY2, HIGH);
  else if (hum > 50.0) digitalWrite(RELAY2, LOW);

  // Relay 3: Distance Control (<= 30cm)
  if (distance <= 30.0 && distance > 0) digitalWrite(RELAY3, HIGH);
  else digitalWrite(RELAY3, LOW);

  // --- 3. การแสดงผลบน LCD 2004 ---
  
  // Line 1: Time
  lcd.setCursor(0, 0);
  char timeStr[20];
  sprintf(timeStr, "Time: %02d:%02d:%02d", now.hour(), now.minute(), now.second());
  lcd.print(timeStr);

  // Line 2: Distance
  lcd.setCursor(0, 1);
  lcd.print("Dist: ");
  lcd.print(distance, 1);
  lcd.print(" cm    ");

  // Line 3: Temp & Hum
  lcd.setCursor(0, 2);
  lcd.print("T:"); lcd.print(temp, 1);
  lcd.print("C H:"); lcd.print(hum, 1);
  lcd.print("%   ");

  // Line 4: Status (เพิ่มแสดงสถานะ PIR/LED)
  lcd.setCursor(0, 3);
  lcd.print("R1:"); lcd.print(digitalRead(RELAY1) ? "O" : "X");
  lcd.print(" R2:"); lcd.print(digitalRead(RELAY2) ? "O" : "X");
  lcd.print(" R3:"); lcd.print(digitalRead(RELAY3) ? "O" : "X");
  lcd.print(" M:"); lcd.print(motion ? "ON " : "OFF");

  delay(500);
}