#include <Keypad.h>
//#include <LiquidCrystal.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);  //0x27 is the i2c address, while 16 = columns, and 2 = rows. 

#include<stdio.h>
const byte ROWS = 4; //four rows
const byte COLS = 3; //three columns
char keys[ROWS][COLS] = {
  {'1','2','3'},
  {'4','5','6'},
  {'7','8','9'},
  {'*','0','#'}
};
byte rowPins[ROWS] = {4, 5, 6, 7}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {8, 9, 10}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );





int relay = 13;

int counter = 0; 
int attempts = 0; 
int max_attempts = 3; 

String mymints;
int minutes = 0; 

String mysecs; 
int seconds = 0; 
long int total_seconds = 0; 
int secflag = 0; 
int timer_started_flag = 0; 


// Tracks the time since last event fired
unsigned long previousMillis=0;
unsigned long int previoussecs = 0; 
unsigned long int currentsecs = 0; 
 unsigned long currentMillis = 0;
  int interval= 1 ; // updated every 1 second
int tsecs = 0; 
 
void setup(){
  Serial.begin(9600);
  lcd.init();                 //Init the LCD
  lcd.backlight();            //Activate backlight 
  

  pinMode(relay, OUTPUT);
  digitalWrite(relay, LOW);
  
  Serial.println("enter password");
    lcd.print("Countdown Timer");

    delay(2000); 
    lcd.clear();
     lcd.print("Enter Minutes:");
}
  
void loop()
{
  
 keypadfunction();
 
}

void keypadfunction()
{ 
 char key = keypad.getKey();
  
  if (key){
    Serial.println(key);
    counter = counter + 1; 
    lcd.setCursor(counter, 1);
    lcd.print(key);
  }
  
  if (key == '1')
  {

    mymints = mymints + 1;   
  }
  
    if (key == '2')
  {

    mymints = mymints + 2;  
  }
  
  if (key == '3')
  {
 
    mymints = mymints + 3; 
  }
  
   if (key == '4')
  {
  
    mymints = mymints + 4;  
  }
  
  if (key == '5')
  {
  
    mymints = mymints + 5;
  }
  
   if (key == '6')
  {
   
    mymints = mymints + 6; 
  }
  
   if (key == '7')
  {

    mymints = mymints + 7; 
  }

   if (key == '8')
  {

    mymints = mymints + 8; 
  }
  
  if (key == '9')
  {

    mymints = mymints + 9;
  }
             
                 if (key == '0')
  {

    mymints = mymints + 0; 
  }

                    if (key == '#')
  {

    counter = 0;
    mymints = ""; 
    minutes = 0;  
    mysecs = ""; 
    seconds = 0; 
    secflag = 0;  

    lcd.clear(); 
    lcd.setCursor(0,0); 
    lcd.print("Enter Minutes:"); 
  }
  
  
        if (key == '*')
  {
lcd.clear();     
minutes = mymints.toInt();
Serial.println(minutes);
lcd.clear(); 
lcd.print("Minutes: "); 
lcd.setCursor(0,1); 
lcd.print(minutes); 
mymints = ""; // empty the string
delay(2000); 
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Enter Seconds:");
counter = 0; 
secflag = 1; 

while(secflag == 1)
{
forSeconds(); 
}    
  }  
   
}

void forSeconds()
{ 
 char key = keypad.getKey();
  
  if (key){
    Serial.println(key);
    counter = counter + 1; 
    lcd.setCursor(counter, 1);
    lcd.print(key);
  }
  
  if (key == '1')
  {

   mysecs = mysecs + 1;   
  }
  
    if (key == '2')
  {

   mysecs = mysecs + 2;  
  }
  
  if (key == '3')
  {
 
    mysecs = mysecs + 3; 
  }
  
   if (key == '4')
  {
  
    mysecs = mysecs + 4;  
  }
  
  if (key == '5')
  {
  
    mysecs = mysecs + 5;
  }
  
   if (key == '6')
  {
   
    mysecs = mysecs + 6; 
  }
  
   if (key == '7')
  {

    mysecs = mysecs + 7; 
  }

   if (key == '8')
  {

    mysecs = mysecs + 8; 
  }
  
  if (key == '9')
  {

    mysecs = mysecs + 9;
  }
             
                 if (key == '0')
  {

    mysecs = mysecs + 0; 
  }

                   if (key == '#')
  {

    counter = 0;
    mymints = ""; 
    minutes = 0;  
    mysecs = ""; 
    seconds = 0; 
    secflag = 0;  

    lcd.clear(); 
    lcd.setCursor(0,0); 
    lcd.print("Enter Minutes:"); 
  }
  
  
  
        if (key == '*')
  {

lcd.clear();     
seconds = mysecs.toInt();
Serial.println(seconds);
lcd.clear();
lcd.setCursor(0,0); 
lcd.print("Seconds: "); 
lcd.setCursor(0,1); 
lcd.print(seconds); 
mysecs = ""; // empty the string
delay(2000); 
lcd.clear();
lcd.setCursor(0,0);
 
lcd.print("Mins      Secs"); 
lcd.setCursor(1,1); 
lcd.print(minutes); 
lcd.setCursor(10,1); 
lcd.print(seconds); 
total_seconds = (minutes * 60) + seconds ;
counter = 0;
secflag = 0; 
timer_started_flag = 1;

lcd.clear();
lcd.print("T Seconds:");
lcd.setCursor(11,0);
lcd.print( total_seconds );
delay(3000); 
while( timer_started_flag == 1)
{
   char key = keypad.getKey();
  
  if (key){
    Serial.println(key);
    counter = counter + 1; 
    lcd.setCursor(counter, 1);

  }

   if (key == '#')
  {

    counter = 0;
    mymints = ""; 
    minutes = 0;  
    mysecs = ""; 
    seconds = 0; 
    secflag = 0;  
    total_seconds = 0; 
     timer_started_flag = 0;
    lcd.clear(); 
    lcd.setCursor(0,0); 
    lcd.print("Enter Minutes:"); 
  }

         //  lcd.clear(); 
  lcd.setCursor(0,0); 
  lcd.print("T Seconds:");
  lcd.setCursor(11,0); 
  lcd.print( total_seconds );
  lcd.setCursor(0,1);
  if( total_seconds > 0)
  {
    digitalWrite(relay, HIGH); 
  lcd.print("load ON "); 
  }

    if( total_seconds <= 0)
  {
    total_seconds = 0; 
    digitalWrite(relay, LOW); 
  lcd.print("load OFF"); 
  }

     currentMillis = millis();
   currentsecs = currentMillis / 1000; 
    if ((unsigned long)(currentsecs - previoussecs) >= interval) {
      total_seconds = total_seconds - 1;
      lcd.clear(); 
      previoussecs = currentsecs;
    }
}
 
  }  
  
  
}