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

// Pin definitions
const int dhtPin = 15;   // Pin DHT22
const int ledPin = 2;    // LED untuk menandakan relay
const int tempThreshold = 30;  // Threshold suhu
const int humThreshold = 60;   // Threshold kelembaban

// DHT setup
#define DHTTYPE DHT22   // Mengganti dari DHT11 ke DHT22
DHT dht(dhtPin, DHTTYPE);

// OLED setup
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Variables
float temperature = 0.0;
float humidity = 0.0;

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

  // Initialize OLED
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("SSD1306 allocation failed");
    for (;;);
  }
  display.clearDisplay();
  display.display();

  // Initialize DHT sensor
  dht.begin();

  // Set LED pin as output
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // Read temperature and humidity from DHT22
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();

  // Display system information on OLED
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println("BMS Monitoring");

  // Display temperature
  display.setCursor(0, 20);
  display.print("Temp: ");
  display.print(temperature);
  display.print(" C");

  // Display humidity
  display.setCursor(0, 30);
  display.print("Hum: ");
  display.print(humidity);
  display.print(" %");

  // Control LED based on temperature and humidity
  if (temperature > tempThreshold || humidity > humThreshold) {
    digitalWrite(ledPin, HIGH);  // Relay ON (LED ON)
    display.setCursor(0, 50);
    display.println("Status: Alarm!");
  } else {
    digitalWrite(ledPin, LOW);   // Relay OFF (LED OFF)
    display.setCursor(0, 50);
    display.println("Status: Normal");
  }

  // Update OLED display
  display.display();

  // Delay before next loop
  delay(1000);
}