/*This software is provided in an “AS IS” condition,NO WARRANTIES in any form apply to this software.
 picmicrolab.com 10.12.2017
***************************************************************************************************************
Arduino Electronic Lock

*/
// include the library code:
#include <LiquidCrystal.h>

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int NewKeyPadVal = 0;
//***************************Default Code Digits Settings******************
int CodeDigit1 =  3;
int CodeDigit2 =  6;
int CodeDigit3 =  9;
int CodeDigit4 =  6;
//**************************************************************************
//----Input Code Digits--
int InputDigit1 =  0;
int InputDigit2 =  0;
int InputDigit3 =  0;
int InputDigit4 =  0;
int InputDigit5 =  0;
//----------------------

void setup() 
{
  // initialize I/O pins.
   pinMode(A0, OUTPUT); //Relay to Elock
//--------------------------4x3 Keypad------------------  
  //------3 columns-----
  pinMode(A3, OUTPUT);
  pinMode(A2, OUTPUT);
  pinMode(A1, OUTPUT);
 
  digitalWrite(A3, HIGH);
  digitalWrite(A2, HIGH);
  digitalWrite(A1, HIGH);
  //-------4 rows-----------
  pinMode(6, INPUT_PULLUP);
  pinMode(7, INPUT_PULLUP);
  pinMode(8, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  //------------------------ 
  //----------------------------------------------------
 
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
}

void loop() 
{
  lcd.display();
  lcd.setCursor(0, 0); // top left
  lcd.print("Code ");
//--------------------------------------------------- 
  delay(400);
  while(Scan_4x3_keypad() == 15)
  delay(1);
  NewKeyPadVal = Scan_4x3_keypad();
  InputDigit1 = NewKeyPadVal;
  lcd.print("*");
//----------------------------------------------------
delay(400);
  while(Scan_4x3_keypad() == 15)
  delay(1);
  NewKeyPadVal = Scan_4x3_keypad();
  InputDigit2 = NewKeyPadVal;
  lcd.print("*");
//----------------------------------------------------
delay(400);
  while(Scan_4x3_keypad() == 15)
  delay(1);
  NewKeyPadVal = Scan_4x3_keypad();
  InputDigit3 = NewKeyPadVal;
   lcd.print("*");
  
//----------------------------------------------------
delay(400);
  while(Scan_4x3_keypad() == 15)
  delay(1);
  NewKeyPadVal = Scan_4x3_keypad();
  InputDigit4 = NewKeyPadVal;
   lcd.print("*");
//----------------------------------------------------
  CompareCodeToInputDigits();
}
 






 void CompareCodeToInputDigits()
 {
 if(CodeDigit1 == InputDigit1 && CodeDigit2 == InputDigit2 && CodeDigit3 == InputDigit3 && CodeDigit4 == InputDigit4 )
 {
   digitalWrite(A0, HIGH); 
   delay(5000);
   digitalWrite(A0, LOW); 
   delay(100);
 }
 
 }

  int Scan_4x3_keypad()
{
  int keypadVal = 15;
  //----------Find 3,6,9,* ----
  digitalWrite(A3, LOW);
  digitalWrite(A2, HIGH);
  digitalWrite(A1, HIGH); 
  if(digitalRead(9) == LOW)  
  keypadVal = 3;
  if(digitalRead(8) == LOW)
  keypadVal = 6;  
  if(digitalRead(7) == LOW)
  keypadVal = 9;
  if(digitalRead(6) == LOW)
  keypadVal = 10;// 10 = #
  //---------------------------

  //----------Find 2,5,8,0 ----
  digitalWrite(A3, HIGH);
  digitalWrite(A2, LOW);
  digitalWrite(A1, HIGH); 
  if(digitalRead(9) == LOW)
  keypadVal = 2;
  if(digitalRead(8) == LOW)
  keypadVal = 5;
  if(digitalRead(7) == LOW)
  keypadVal = 8;
  if(digitalRead(6) == LOW)
  keypadVal = 0;
  //---------------------------

  //----------Find 1,4,7,* ----
  digitalWrite(A3, HIGH);
  digitalWrite(A2, HIGH);
  digitalWrite(A1, LOW); 
  if(digitalRead(9) == LOW)
  keypadVal = 1;
  if(digitalRead(8) == LOW)
  keypadVal = 4;
  if(digitalRead(7) == LOW)
  keypadVal = 7;
  if(digitalRead(6) == LOW)
  keypadVal = 11;// * = 11

  return keypadVal;
  //---------------------------
}