//LCD
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

#define BACKLIGHT_PIN 3

LiquidCrystal_I2C lcd(0x20, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); 

//Activation
int turnonPin = 11;
int turnon = 0;
unsigned int a = 0;

//Program
int programPin = 10;
int program = 0;
unsigned int b = 0;

//Decrement
int upPin = 9;
int up = 0;

//Increment
int downPin = 8;
int down = 0;

unsigned int y = 1000;
unsigned int DELAY = 1;

int led = 13;
#define SensorINPUT  3  
unsigned char state = 0;

void setup() {

  lcd.begin (20,4); //  
  // LCD Backlight ON
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
  lcd.setBacklight(HIGH);
  lcd.home ();
  
  pinMode(turnon, INPUT);
  pinMode(up, INPUT);
  pinMode(down, INPUT);
  pinMode(led, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(SensorINPUT, INPUT);

  attachInterrupt(1, blink, FALLING);
  
  Serial.begin(9600);
}

void loop() {
 
 Activation();
 Delay();

 
}

//Activation alarma
void Activation(){

 delay(1000);
 turnon = digitalRead(turnonPin);
 
if(turnon == HIGH){
  a=a+1;
  }
  
if(a > 1){
   a=0;
  }

if(a < 0){
   a=0;
  }

if(a == 1){
  lcd.setCursor(0,0);
  lcd.print("  ALARM ACTIVATED  ");
  digitalWrite(2, LOW);
  digitalWrite(4, HIGH);
  digitalWrite(5, LOW);
}
else{
  digitalWrite(5, HIGH);
  digitalWrite(4, LOW);
  digitalWrite(2, HIGH);
  lcd.setCursor(0,0);
  lcd.print("*");
  lcd.setCursor(1,0);
  lcd.print("ALARM DEACTIVATED");
  lcd.setCursor(18,0);
  lcd.print("*");
  
 }
}

void Delay() {

 up = digitalRead(upPin);
 down = digitalRead(downPin);
 program = digitalRead(programPin);

 
if(up == HIGH){
  y = y + 1000; 
 }
  if(down == HIGH){
   y = y - 1000;
   }

if(y > 15000){
  y = 15000;
  }
if(y < 1000){
  y = 15000;
  }


if(program == HIGH){
  b = b + 1;
}
 if(b > 3){
  b = 1;
}
if(b < 1){
  b=1;
}

DELAY = y/1000;
if(DELAY < 10){
  lcd.setCursor(19,1);
  lcd.print(" ");
  }
if(DELAY < 10){
  lcd.setCursor(19,2);
  lcd.print(" ");
}

switch(b){
  case 1:
  if(state != 0&&a == HIGH){
    state = 0;
    for(int x = 0;x<=5;x++){
    digitalWrite(led, HIGH);
    lcd.clear();
    lcd.setCursor(7,1);
    lcd.print("BREAK IN");
    delay(y);
    digitalWrite(led,LOW);
     lcd.clear();
    delay(200);
    }
  }
else
{
  digitalWrite(led,LOW);
}
  Serial.println(y);
if(a == 0){ 
lcd.setCursor(0,2);
lcd.print("ALARM DURATION:");
lcd.print(" ");
lcd.print(DELAY);
lcd.print(" ");
lcd.print("s");

lcd.setCursor(0,3);
lcd.print("Program:");
lcd.print(" ");
lcd.print("Sound    ");
}
else{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("  ALARM ACTIVATED  ");
}
break;

 case 2:
 if(state != 0&&a == HIGH){
  state = 0;
    for(int x = 0;x<=5;x++){
    digitalWrite(led, HIGH);
    lcd.clear();
    lcd.setCursor(7,1);
    lcd.print("BREAK IN");
    digitalWrite(12, HIGH);
    delay(y);
    digitalWrite(led,LOW);
    digitalWrite(12, LOW);
     lcd.clear();
    delay(200);
    }
  }
else
{
  digitalWrite(12, LOW);
  digitalWrite(led,LOW);
}

if(a == 0){
 lcd.setCursor(0,2);
lcd.print("ALARM DURATION:");
lcd.print(" ");
lcd.print(DELAY);
lcd.print(" ");
lcd.print("s");

lcd.setCursor(0,3);
lcd.print("Program:");
lcd.print(" ");
lcd.print("Sound+LED  ");
}
else{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("  ALARM ACTIVATED  ");
}
break;

case 3:
if(state != 0&&a == HIGH){
  state = 0;
    for(int x = 0;x<=5;x++){
    digitalWrite(12, HIGH);
    lcd.clear();
    lcd.setCursor(7,1);
    lcd.print("BREAK IN");
    delay(y);
    digitalWrite(12,LOW);
     lcd.clear();
    delay(200);
    }
  }
else
{
  digitalWrite(led,LOW);
}

if(a == 0){
lcd.setCursor(0,2);
lcd.print("ALARM DURATION:");
lcd.print(" ");
lcd.print(DELAY);
lcd.print(" ");
lcd.print("s");

lcd.setCursor(0,3);
lcd.print("Program:");
lcd.print(" ");
lcd.print("Quiet    ");
}
else{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("  ALARM ACTIVATED  ");
}
break;
}

}
void blink() {
    state++;
}