// definicja LCD Display
#include <LiquidCrystal_I2C.h>
#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

// koniec definicji

const float BETA = 3950;
int sensor1counter = 0;
int sensor2counter = 0;
const int relay = 10;
int suspendbuzzer = 0;
int suspendbutton = 0; // determine if a suspend button is pressed

// user defined parameters
const int sensor1_possitive_max = 5;
const int sensor2_possitive_max = 5;
const int time_to_turn_off_pump = -14;
const int alarm_suspend_time = 6;


void setup() {
// incjacja LCD Display
lcd.init();
//lcd.backlight();

//koniec inicjacji LCD

pinMode(11, INPUT_PULLUP );
pinMode(10, OUTPUT);
Serial.begin(9600);
digitalWrite(2, LOW); // sensor 1 ready
digitalWrite(3, LOW); // sensor 1 triggered
digitalWrite(relay, LOW); // relay

// display user parameters and wait 2 seconds before this shit will go on
Serial.println("Declared Parameters / Variables: ");
Serial.print("Sensor 1 threshold: "); Serial.println(sensor1_possitive_max);
Serial.print("Sensor 2 threshold: "); Serial.println(sensor2_possitive_max);
Serial.print("Alarm snooze [s]: "); Serial.println(alarm_suspend_time);
Serial.print("Time to shut down the pump [s]: "); Serial.println(time_to_turn_off_pump);
Serial.println("...monitoring will start in 2 secs...");


//powitalna wiadomosc
//lcd.print("System initiating...");
lcd.setCursor(0, 0);
lcd.println("CO:    OK");
lcd.setCursor(0, 1);
lcd.println("Smoke: No");
delay (2000);
lcd.clear();

}
void loop() {
 
 //first sensor reading and calculation
 int sensor1_analogValue = analogRead(A2);
   float sensor1_value = 1 / (log(1 / (1023. / sensor1_analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
 
 // second senor reading and calculation
 int sensor2_analogValue = analogRead(A3);
   float sensor2_value = 1 / (log(1 / (1023. / sensor2_analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;




  Serial.print("Temperature: "); Serial.print(sensor1_value);  Serial.println(" ℃");
  Serial.print("Temperature: "); Serial.print(sensor2_value);  Serial.println(" ℃");
  Serial.print("Sensor 1 counter: ");  Serial.println(sensor1counter);
  Serial.print("Sensor 2 counter: ");  Serial.println(sensor2counter);
  Serial.print("suspendbutton: ");  Serial.println(suspendbutton);
  Serial.print("suspendbuzzer: ");  Serial.println(suspendbuzzer);
  Serial.println("----------");
  

  // sensor 1 triggered
    if(sensor1_value>50){
      sensor1counter = sensor1counter+1 ; 
        }  
    else {
      if (sensor1counter == 0) {}
      
      else{
        sensor1counter = sensor1counter-1;
      }
   
    }
  if (sensor1counter >= sensor1_possitive_max) {
    digitalWrite(3, HIGH);
    if (suspendbuzzer <=0) {tone(12, 262, 125);}
    suspendbutton = digitalRead(11);
          if (suspendbutton == HIGH){
          suspendbuzzer = alarm_suspend_time;}
          //LCD Notification
         // lcd.clear();
          //lcd.setCursor(0, 0);
          //lcd.print("S1 Alarm Suspended");
         // lcd.setCursor(0, 1);
         // lcd.print(suspendbuzzer);
         // lcd.print (" sec left");

        suspendbuzzer = suspendbuzzer-1;
       if (suspendbuzzer>0) {digitalWrite(3, LOW);}  
  }

// sensor 2 triggered
    if(sensor2_value>50){
      sensor2counter = sensor2counter+1 ; 
        }  
    else {
      if (sensor2counter == 0) {}
      
      else{
        sensor2counter = sensor2counter-1;
      }
   
    }
  if (sensor2counter >= sensor2_possitive_max) {
    digitalWrite(4, HIGH);
    if (suspendbuzzer <=0) {tone(12, 262, 125);}
    suspendbutton = digitalRead(11);
          if (suspendbutton == HIGH){
          suspendbuzzer = alarm_suspend_time;}
        suspendbuzzer = suspendbuzzer-1;
       if (suspendbuzzer>0) {digitalWrite(4, LOW);}} 


// display sensor status on LCD

if (sensor1counter >= sensor1_possitive_max) {
  //lcd.clear();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.println("CO:    HIGH");
} else {
  lcd.noBacklight();
  lcd.setCursor(0, 0);
  lcd.println("CO:    OK");
}

if (sensor2counter >= sensor2_possitive_max) {
  //lcd.clear();
  lcd.backlight();
  lcd.setCursor(0, 1);
  lcd.println("SMOKE: HIGH");
} else {
  lcd.noBacklight();
  lcd.setCursor(0, 1);
  lcd.println("SMOKE: No");
}


// prepare pump or relay to stop
if (suspendbuzzer < time_to_turn_off_pump) {
    digitalWrite(relay, HIGH);
    Serial.println("the Fuel Pump Has Been Stopped");
    
    lcd.clear();
    lcd.print("Pump shut-off");

    delay (100000);
}
  delay (1000); 
}