#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 voltageSensorPin = 36;   // Analog pin untuk sensor tegangan
const float voltageDividerFactor = 3.9; // Faktor pembagi tegangan untuk kalibrasi
const int humThreshold = 60;       // Threshold kelembaban
const int tempThreshold = 30;      // Threshold suhu tetap

// DHT setup
#define DHTTYPE DHT22   // Menggunakan 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;
float voltage = 0.0;     // Variabel untuk menyimpan nilai tegangan

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() {
  // Baca suhu dan kelembaban dari DHT22
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();

  // Baca nilai dari sensor tegangan
  int sensorValue = analogRead(voltageSensorPin);
  voltage = sensorValue * (3.3 / 4095) * voltageDividerFactor; // Kalibrasi tegangan

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

  // Tampilkan nilai suhu
  display.setCursor(0, 15);
  display.print("Temp: ");
  display.print(temperature);
  display.print(" C");

  // Tampilkan nilai kelembaban
  display.setCursor(0, 25);
  display.print("Hum: ");
  display.print(humidity);
  display.print(" %");

  // Tampilkan nilai tegangan
  display.setCursor(0, 35);
  display.print("Voltage: ");
  display.print(voltage);
  display.print(" V");

  // Control LED berdasarkan suhu dan kelembaban
  if (temperature > tempThreshold || humidity > humThreshold) {
    digitalWrite(ledPin, HIGH);  // Relay ON (LED ON)
    display.setCursor(0, 55);
    display.println("Status: Alarm!");
  } else {
    digitalWrite(ledPin, LOW);   // Relay OFF (LED OFF)
    display.setCursor(0, 55);
    display.println("Status: Normal");
  }

  // Update OLED display
  display.display();

  // Print the voltage value to the serial monitor
  Serial.print("Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");

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