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

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

#define DHTPIN 7     // Digital pin connected to the DHT sensor
#define DHTTYPE    DHT22     // DHT 22 (AM2302)

DHT dht(DHTPIN, DHTTYPE);

unsigned long previousMillis = 0; // stores the last time the display was updated
const long interval = 5000; // interval at which to update (5 seconds)

float lux = 65.00; // Initialize lux value

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

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();
  display.setTextColor(WHITE);
}

void loop() {
  unsigned long currentMillis = millis();

  // Check if 5 seconds have passed
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis; // save the last time the display was updated

    float h = dht.readHumidity(); 
    float t = dht.readTemperature(); 

    Serial.print("Humidity: "); 
    Serial.println(h); 
    Serial.print("Temperature: "); 
    Serial.print(t); 
    Serial.println("°C ");
    
    display.clearDisplay(); 

    display.setTextSize(2); 
    display.setTextColor(WHITE); 
    display.setCursor(20, 0);  //(0,0)แสดงความอุณหภูมิ
    display.print("DHT&ALS"); //ย่อมาจาก Digital Temperature and Humidity & Ambient Light Sensor 

    display.setTextSize(1); 
    display.setTextColor(WHITE); 
    display.setCursor(0, 25); //(0,10)แสดงความอุณหภูมิ
    display.print("Temperature: "); 
    display.print(t); 
    display.print(" C"); 

    display.setTextSize(1); 
    display.setTextColor(WHITE); 
    display.setCursor(0, 35); //(0,10)แสดงความชื้น
    display.print("Humidity   : "); 
    display.print(h); 
    display.print(" %"); 

    display.setTextSize(1); 
    display.setTextColor(WHITE); 
    display.setCursor(0, 45); //(0,10)แสดงความชื้น
    display.print("Light      : "); 
    display.print(lux); // แสดงค่า lux ที่คุณตั้งไว้
    display.print(" LX");

    display.display(); // Update the display
  }
}