#include <MQ135.h>
#include <dht.h>

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


#define dht_pin 11
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

const int buzzer = 7; 
const int ANALOGPIN = 0;
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

MQ135 gasSensor = MQ135(ANALOGPIN);
dht DHT;


void setup() {
 // Serial.begin(115200);
 Serial.begin(9600);
 pinMode(buzzer, OUTPUT);
    
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(1000);
  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 10);

  display.println("");
  display.println("[Ion Tudor Matei]");
  display.println("Initializing..");
  delay(1500);
  display.display();
  
}

void loop() {
  int sensorValue = analogRead(A0);
  DHT.read11(dht_pin);

  
  display.clearDisplay();
  display.setCursor(0, 10);

  display.println("");
  display.println("Temperature: ");
  display.print(DHT.temperature);
  display.print(" C");
  display.println("");
  display.println("Humidity: ");
  display.print(DHT.humidity);
  display.print("%");
  display.println("");
  display.println(sensorValue);
  display.display();
  
  Serial.print("Humidity: ");
    Serial.print(DHT.humidity);
    Serial.print("%  ");
    Serial.print("Temperature: ");
    Serial.print(DHT.temperature); 
    Serial.println("C  ");
    delay(1500);

  if(sensorValue > 80)
  {
    display.setCursor(0, 10);
    display.clearDisplay();
    display.println("");
    display.println("!! Gas Leakage !!");
    display.println("");
    display.println("Or CO2 levels are too high!");
    display.display();
    tone(buzzer, 2000);
    delay(3000);    
  }
  noTone(buzzer);
  
}