//Viral Science www.viralsciencecreativity.com www.youtube.com/c/viralscience
//Arduino Timer Relay - Triger relay for specific time
/*#include <LiquidCrystal_I2C.h>
#include <Wire.h> 
LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display*/
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

#include "Countimer.h" //https://github.com/inflop/Countimer
Countimer tdown;
#include <EEPROM.h>

#define bt_set    A0
#define bt_up     A1
#define bt_down   A2
#define bt_start  A3

int screenOffMsg =0;
String password="1234";
String tempPassword;
boolean activated = false; // State of the alarm
boolean isActivated;
boolean activateAlarm = false;
boolean alarmActivated = false;
boolean enteredPassword; // State of the entered password to stop the alarm
boolean passChangeMode = false;
boolean passChanged = false;

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char keypressed;
//define the cymbols on the buttons of the keypads
char keyMap[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {5, 4, 3, 2}; //Row pinouts of the keypad
byte colPins[COLS] = {9, 8, 7, 6}; //Column pinouts of the keypad

Keypad myKeypad = Keypad( makeKeymap(keyMap), rowPins, colPins, ROWS, COLS);

int time_s = 0;
int time_m = 0;
int time_h = 0;

int set = 0;
int flag1=0, flag2=0;

int relay = 10;
int buzzer = 6;

void setup() {
Serial.begin (9600);

pinMode(bt_set,   INPUT_PULLUP);
pinMode(bt_up,    INPUT_PULLUP);
pinMode(bt_down,  INPUT_PULLUP);
pinMode(bt_start, INPUT_PULLUP);

pinMode(relay, OUTPUT);
pinMode(buzzer, OUTPUT);
  lcd.init();                      // initialize the lcd 
  lcd.init();
  // Print a message to the LCD.
  lcd.backlight();
lcd.setCursor(0,0);
lcd.print("   Welcome To   ");
lcd.setCursor(0,1);
lcd.print("Countdown  Timer");
tdown.setInterval(print_time, 999);
eeprom_read();
delay(1000);
lcd.clear();
}

void print_time(){
time_s = time_s-1;
if(time_s<0){time_s=59; time_m = time_m-1;}
if(time_m<0){time_m=59; time_h = time_h-1;}
}

void tdownComplete(){Serial.print("ok");}

//tdown.stop(); 

void loop(){
tdown.run();

if(digitalRead (bt_set) == 0){
if(flag1==0 && flag2==0){flag1=1;
set = set+1;
if(set>3){set=0;}
delay(100); 
}
}else{flag1=0;}

if(digitalRead (bt_up) == 0){
if(set==0){tdown.start(); flag2=1;}
if(set==1){time_s++;}
if(set==2){time_m++;}
if(set==3){time_h++;}
if(time_s>59){time_s=0;}
if(time_m>59){time_m=0;}
if(time_h>99){time_h=0;}
if(set>0){eeprom_write();}
delay(200); 
}

if(digitalRead (bt_down) == 0){
if(set==0){tdown.stop(); flag2=0;}
if(set==1){time_s--;}
if(set==2){time_m--;}
if(set==3){time_h--;}
if(time_s<0){time_s=59;}
if(time_m<0){time_m=59;}
if(time_h<0){time_h=99;}
if(set>0){eeprom_write();}
delay(200); 
}

if (activateAlarm) {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Alarm Activated!");
    //initialDistance = getDistance();
    activateAlarm = false;
    alarmActivated = true;
  }

    if (alarmActivated == true){flag2=1;
        tone(buzzer, 1000); // Send 1KHz sound signal 
        lcd.clear();
        enterPassword();
      }
  if (!alarmActivated) {
     if(digitalRead (bt_start) == 0){  
      lcd.clear();
      lcd.setCursor(0,2);
      lcd.print("A - Activate");
      lcd.setCursor(0,3);
      lcd.print("B - Change Pass");
      screenOffMsg = 1;
    }
    keypressed = myKeypad.getKey();
     if (keypressed =='A'){        //If A is pressed, activate the alarm
      tone(buzzer, 1000, 200);
      activateAlarm = true;            
    }
    else if (keypressed =='B') {
      lcd.clear();
      int i=1;
      tone(buzzer, 2000, 100);
      tempPassword = "";
      lcd.setCursor(0,0);
      lcd.print("Current Password");
      lcd.setCursor(0,1);
      lcd.print(">");
      passChangeMode = true;
      passChanged = true;   
      while(passChanged) {      
      keypressed = myKeypad.getKey();
      if (keypressed != NO_KEY){
        if (keypressed == '0' || keypressed == '1' || keypressed == '2' || keypressed == '3' ||
            keypressed == '4' || keypressed == '5' || keypressed == '6' || keypressed == '7' ||
            keypressed == '8' || keypressed == '9' ) {
         tempPassword += keypressed;
         lcd.setCursor(i,1);
         lcd.print("*");
         i++;
         tone(buzzer, 2000, 100);
        }
      }
      if (i > 5 || keypressed == '#') {
        tempPassword = "";
        i=1;
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("Current Password");
        lcd.setCursor(0,1);
        lcd.print(">"); 
      }
      if ( keypressed == '*') {
        i=1;
        tone(buzzer, 2000, 100);
        if (password == tempPassword) {
          tempPassword="";
          lcd.clear();
          lcd.setCursor(0,0);
          lcd.print("Set New Password");
          lcd.setCursor(0,1);
          lcd.print(">");
          while(passChangeMode) {
            keypressed = myKeypad.getKey();
            if (keypressed != NO_KEY){
              if (keypressed == '0' || keypressed == '1' || keypressed == '2' || keypressed == '3' ||
                  keypressed == '4' || keypressed == '5' || keypressed == '6' || keypressed == '7' ||
                  keypressed == '8' || keypressed == '9' ) {
                tempPassword += keypressed;
                lcd.setCursor(i,1);
                lcd.print("*");
                i++;
                tone(buzzer, 2000, 100);
              }
            }
            if (i > 5 || keypressed == '#') {
              tempPassword = "";
              i=1;
              tone(buzzer, 2000, 100);
              lcd.clear();
              lcd.setCursor(0,0);
              lcd.print("Set New Password");
              lcd.setCursor(0,1);
              lcd.print(">");
            }
            if ( keypressed == '*') {
              i=1;
              tone(buzzer, 2000, 100);
              password = tempPassword;
              passChangeMode = false;
              passChanged = false;
              screenOffMsg = 0;
            }            
          }
        }
      }
    }
   }
 }
lcd.setCursor(0,0);
if(set==0){lcd.print("      Timer     ");}
if(set==1){lcd.print("  Set Timer SS  ");}
if(set==2){lcd.print("  Set Timer MM  ");}
if(set==3){lcd.print("  Set Timer HH  ");}

lcd.setCursor(4,1);
if(time_h<=9){lcd.print("0");}
lcd.print(time_h);
lcd.print(":");
if(time_m<=9){lcd.print("0");}
lcd.print(time_m);
lcd.print(":");
if(time_s<=9){lcd.print("0");}
lcd.print(time_s);
lcd.print("   ");

if(time_s==0 && time_m==0 && time_h==0 && flag2==1){flag2=0;
tdown.stop(); 
digitalWrite(relay, LOW);
digitalWrite(buzzer, HIGH);
delay(300);
digitalWrite(buzzer, LOW);
delay(200);
digitalWrite(buzzer, HIGH);
delay(300);
digitalWrite(buzzer, LOW);
delay(200);
digitalWrite(buzzer, HIGH);
delay(300);
digitalWrite(buzzer, LOW);
}

if(flag2==1){digitalWrite(relay, HIGH);}
else{digitalWrite(relay, LOW);}

delay(1);
}
void enterPassword() {
  int k=5;
  tempPassword = "";
  activated = true;
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(" *** ALARM *** ");
  lcd.setCursor(0,1);
  lcd.print("Pass>");
      while(activated) {
      keypressed = myKeypad.getKey();
      if (keypressed != NO_KEY){
        if (keypressed == '0' || keypressed == '1' || keypressed == '2' || keypressed == '3' ||
            keypressed == '4' || keypressed == '5' || keypressed == '6' || keypressed == '7' ||
            keypressed == '8' || keypressed == '9' ) {
          tempPassword += keypressed;
          lcd.setCursor(k,1);
          lcd.print("*");
          k++;
        }
      }
      if (k > 9 || keypressed == '#') {
        tempPassword = "";
        k=5;
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print(" *** ALARM *** ");
        lcd.setCursor(0,1);
        lcd.print("Pass>");
      }
      if ( keypressed == '*') {
        if ( tempPassword == password ) {
               eeprom_read(); 
                digitalWrite(relay, HIGH); 
                 tdown.restart(); 
                 tdown.start();
          activated = false;
          alarmActivated = false;
          noTone(buzzer);
          screenOffMsg = 0; 
        }
        else if (tempPassword != password) {
          lcd.setCursor(0,1);
          lcd.print("Wrong! Try Again");
          delay(2000);
          lcd.clear();
          lcd.setCursor(0,0);
          lcd.print(" *** ALARM *** ");
          lcd.setCursor(0,1);
          lcd.print("Pass>");
        }
      }    
    }
}

void eeprom_write(){
EEPROM.write(1, time_s);  
EEPROM.write(2, time_m);  
EEPROM.write(3, time_h);  
}

void eeprom_read(){
time_s =  EEPROM.read(1);
time_m =  EEPROM.read(2);
time_h =  EEPROM.read(3);
}