#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <MQ135.h>
#include <Adafruit_Sensor.h>
//#include <U8g2lib.h>
#include<DHT.h>
#include <Wire.h>
//U8G2_SSD1306_128X64_NONAME_2_HW_I2C u8g2(U8G2_R0);
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH,SCREEN_HEIGHT,&Wire,-1);
#define DHTTYPE DHT22
#define DHTPIN 2
DHT dht(DHTPIN, DHTTYPE);
//MQ135 gasSensor(A0);
const float GAMMA = 0.7;
const float RL10 = 50;

void setup() {
  Serial.begin(9600);
  Wire.begin();
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);}
    delay(2000);
    display.clearDisplay();
    display.setTextColor(WHITE);
      
 // u8g2.begin();
  //u8g2.clearBuffer();
  //u8g2.setFont(u8g2_font_ncenB14_tr);
 // u8g2.setFont(u8g2_font_8x13_mf);
  dht.begin();

}



float getLightingMeter() {
  int analogValue = analogRead(A1);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  return lux ;  // Replace with your actual air quality calculation
}

void displayTemperaturePage(float temperature) {
  //u8g2.clearBuffer();
  //u8g2.setCursor(0, 10);
  //u8g2.drawStr(0,10,"Temperature:");
  //u8g2.setCursor(0, 20);
  //u8g2.println(temperature);
  //u8g2.drawStr(0,20,"Can you see this!");
  //u8g2.sendBuffer();

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print("*C\t");
  
  display.clearDisplay();
  display.setTextSize(1);
  display.setCursor(0,0);
  display.print("Temp: ");
  display.setTextSize(1);
  display.setCursor(70,0);
  display.print(temperature);
  //display.print(" ");
  display.setTextSize(1);
  display.cp437(true);
  display.write(167);
  display.setTextSize(0.5);
  display.print("C");
  display.display();
}

void displayHumidityPage(float humidity) {
  //u8g2.clearBuffer();
  //u8g2.setCursor(0, 10);
  //u8g2.print("Humidity:");
  //u8g2.setCursor(0, 20);
  //u8g2.println(humidity);
  //u8g2.sendBuffer();
  Serial.println("Humidity: ");
  Serial.print(humidity);
  Serial.print("%\t");
  display.clearDisplay();
  display.setTextSize(1);
  display.setCursor(0, 10);
  display.print("Humidity: ");
  display.setTextSize(1);
  display.setCursor(70, 10);
  display.print(humidity);
  display.print("%");
  display.display();
}

//void displayAirQualityPage(float airQuality) {
 // u8g2.clearBuffer();
  //u8g2.setCursor(0, 10);
  //u8g2.println("Air Quality:");
  //u8g2.setCursor(0, 20);
  //u8g2.println(airQuality);
  //u8g2.sendBuffer();
//}

void displayLightlevel(float lux){
  //u8g2.clearBuffer();
  //u8g2.setCursor(0, 10);
  //u8g2.print("Light:");
  //u8g2.setCursor(0, 20);
  //.println(lux);
  //u8g2.sendBuffer();
  Serial.println("Lighting: ");
  Serial.print(lux);
  Serial.print("lx\t");
  display.clearDisplay();
  display.setTextSize(1);
  display.setCursor(0, 20);
  display.print("Light: ");
  display.setTextSize(1);
  display.setCursor(70, 20);
  display.print(lux);
  display.print("lx");
  display.display();
}
void loop() {
  // Read sensor data
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  //float airQuality = getAirQuality();
  float lux = getLightingMeter();

  
  // Display data on different pages
  displayTemperaturePage(temperature);
  delay(5000);
  displayHumidityPage(humidity);
  delay(5000);

 
  //displayAirQualityPage(airQuality);
  //delay(5000);
  displayLightlevel(lux);
  delay(5000);
  display.display();
}