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

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

// create an OLED display object connected to I2C
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

//Pins Where Input and Output is Connected
int Butane = 12;
int LPG = 13;
int Kerosene = 14;
int WaterPump = 2;
int ExhaustFan = 4;

void setup() {
  Serial.begin(9600); // Begins Serial Monitor

  //Declares INPUT Pins
  pinMode(LPG,INPUT);
  pinMode(Butane,INPUT);
  pinMode(Kerosene,INPUT);
  //Declares OUTPUT Pins
  pinMode(WaterPump,OUTPUT);
  pinMode(ExhaustFan,OUTPUT);

    // initialize OLED display with I2C address 0x3C
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  delay(2000);         // wait two seconds for initializing
  oled.setTextSize(1);         // set text size
  oled.setTextColor(WHITE);    // set text color

}

void loop() {
  oled.display(); //starts oled display
  delay(1000);    //Time delay
  oled.clearDisplay(); //Clears oled display 

  //Reads Sensor/Input Values
  int LPGSensor = analogRead(LPG);
  int ButaneSensor = analogRead(Butane);
  int KeroseneSensor = analogRead(Kerosene);

  //Used For Debuging
  //oled.setCursor(0,0);
  //oled.print(LPGSensor);

  //oled.setCursor(0,20);
  //oled.print(ButaneSensor);

  //oled.setCursor(0,40);
  //oled.print(KeroseneSensor);
  //oled.display();

  //Displays Sensor Readings
  oled.setCursor(0,0);
  if (LPGSensor<300){ oled.print("No LPG Leak");}
  else if (LPGSensor>300 && LPGSensor<600){oled.print("LPG Leak");}
  else{oled.print("Critical LPG Leak");}

  oled.setCursor(0,20);
  if (ButaneSensor<300){ oled.print("No Butane Leak");}
  else if (ButaneSensor>300 && ButaneSensor<600){oled.print("Butane Leak");}
  else{oled.print("Critical Butane Leak");}

  oled.setCursor(0,40);
  if (KeroseneSensor<300){ oled.print("No Kerosene Leak");}
  else if (KeroseneSensor>300 && KeroseneSensor<600){ oled.print("Kerosene Leak");}
  else{oled.print("Critical Kerosene Leak");}

//Outputs Exhaust Fan and Water Pump Depending on Sensor Level
if (LPGSensor>300 || ButaneSensor>300 || KeroseneSensor>300)
{digitalWrite(ExhaustFan,HIGH);}
else{digitalWrite(ExhaustFan,LOW);}

if (LPGSensor>600 || ButaneSensor>600 || KeroseneSensor>600)
{digitalWrite(WaterPump,HIGH);}
else {digitalWrite(WaterPump,LOW);}
}