#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// OLED reset pin (tidak digunakan, -1)
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Pin setup
#define DHTPIN 2      // DHT22 data pin
#define PIRPIN 3      // PIR sensor pin
#define RELAY_AC 4    // Relay pin for AC
#define BUTTON_UP 6   // Button to increase target temperature
#define BUTTON_DOWN 7 // Button to decrease target temperature

// DHT Sensor setup
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Variables
float temperature = 0.0;
float humidity = 0.0;
int targetTemperature = 25;  // Default target temperature
bool motionDetected = false;
unsigned long lastMotionTime = 0;
const unsigned long motionTimeout = 300000;  // 5 minutes (300,000 ms)

void setup() {
  // Initialize serial monitor
  Serial.begin(9600);
  
  // Initialize DHT22 sensor
  dht.begin();
  
  // Initialize OLED display
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.display();
  delay(2000);  // Pause for 2 seconds
  
  // Initialize PIR sensor
  pinMode(PIRPIN, INPUT);
  
  // Initialize relay pins
  pinMode(RELAY_AC, OUTPUT);
  
  // Initialize button pins
  pinMode(BUTTON_UP, INPUT_PULLUP);
  pinMode(BUTTON_DOWN, INPUT_PULLUP);
  
  // Set initial states
  digitalWrite(RELAY_AC, LOW);     // AC off
  
  // Clear the display
  display.clearDisplay();
}

void loop() {
  // Read temperature and humidity from DHT22
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();
  
  // Check for PIR motion detection
  motionDetected = digitalRead(PIRPIN);
  
  if (motionDetected) {
    lastMotionTime = millis(); // Reset motion timer
  }

  // If no motion for the timeout period, turn off AC/Heater
  if (millis() - lastMotionTime > motionTimeout) {
    digitalWrite(RELAY_AC, LOW);
  } else {
    // Control AC/Heater based on temperature
    if (temperature > targetTemperature) {
      digitalWrite(RELAY_AC, HIGH);  // Turn on AC
    } else if (temperature < targetTemperature) {
      digitalWrite(RELAY_AC, LOW);   // Turn off ACr
    } else {
      digitalWrite(RELAY_AC, LOW);
    }
  }

  // Check buttons for manual temperature adjustment
  if (digitalRead(BUTTON_UP) == LOW) {
    targetTemperature++;
    delay(200);  // Debounce delay
  } else if (digitalRead(BUTTON_DOWN) == LOW) {
    targetTemperature--;
    delay(200);  // Debounce delay
  }
  
  // Display data on OLED
  display.clearDisplay();

  // Draw section for Temperature
  display.drawRect(0, 0, SCREEN_WIDTH / 2, SCREEN_HEIGHT, WHITE);
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(5, 20);
  display.print(temperature, 1);
  display.println("C");

  // Draw section for Humidity
  display.drawRect(SCREEN_WIDTH / 2, 0, SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, WHITE);
  display.setCursor(SCREEN_WIDTH / 2 + 5, 10);
  display.setTextSize(1);
  display.print("H: ");
  display.setCursor(SCREEN_WIDTH / 2 + 30, 10);  // Geser angka kelembapan lebih ke kanan
  display.setTextSize(2);
  display.print(humidity, 1);

  // Draw section for Motion Detection
  display.drawRect(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, WHITE);
  display.setCursor(SCREEN_WIDTH / 2 + 5, SCREEN_HEIGHT / 2 + 10);
  display.setTextSize(1);
  if (motionDetected) {
    display.print("M: Yes");
  } else {
    display.print("M: No");
  }

  // Display everything
  display.display();
  
  delay(1000); // Delay for 1 second before updating
}