Arduino door lock code

/*  keypad_alnum sketch
*
*  Difficulty:  Intermediate
*
*  ******* THE KEYPAD REQUIRES PULL-UP RESISTORS ON THE ROW PINS. *******
*
*  Description:
*    This is a demonstration of using keypadEvents to switch between keymaps
*    while using only one keypad.  The main concepts being demonstrated are:
*
*        Using the keypad events, PRESSED, HOLD and RELEASED to simplify coding.
*        How to use setHoldTime() and why.
*        Making more than one thing happen with the same key.
*        Assigning and changing keymaps on the fly.
*
*    Another useful feature is also included with this demonstration although
*    it’s not really one of the concepts that I wanted to show you.  If you look
*    at the code in the PRESSED event you will see that the first section of that
*    code is used to scroll through three different letters on each key.  For
*    example, pressing the ‘2’ key will step through the letters ‘d’, ‘e’ and ‘f’.
*
*
*  Using the keypad events, PRESSED, HOLD and RELEASED to simplify coding
*    Very simply, the PRESSED event occurs imediately upon detecting a pressed
*    key and will not happen again until after a RELEASED event.  When the HOLD
*    event fires it always falls between PRESSED and RELEASED.  However, it will
*    only occur if a key has been pressed for longer than the setHoldTime() interval.
*
*  How to use setHoldTime() and why
*    Take a look at keypad.setHoldTime(500) in the code.  It is used to set the
*    time delay between a PRESSED event and the start of a HOLD event.  The value
*    500 is in milliseconds (mS) and is equivalent to half a second.  After pressing
*    a key for 500mS the HOLD event will fire and any code contained therein will be
*    executed.  This event will stay active for as long as you hold the key except
*    in the case of bug #1 listed above.
*
*  Making more than one thing happen with the same key.
*    If you look under the PRESSED event (case PRESSED:) you will see that the ‘#’
*    is used to print a new line, Serial.println().  But take a look at the first
*    half of the HOLD event and you will see the same key being used to switch back
*    and forth between the letter and number keymaps that were created with alphaKeys[4][5]
*    and numberKeys[4][5] respectively.
*
*  Assigning and changing keymaps on the fly
*    You will see that the ‘#’ key has been designated to perform two different functions
*    depending on how long you hold it down.  If you press the ‘#’ key for less than the
*    setHoldTime() then it will print a new line.  However, if you hold if for longer
*    than that it will switch back and forth between numbers and letters.  You can see the
*    keymap changes in the HOLD event.
*
*
*  In addition…
*      You might notice a couple of things that you won’t find in the Arduino language
*    reference.  The first would be #include <ctype.h>.  This is a standard library from
*    the C programming language and though I don’t normally demonstrate these types of
*    things from outside the Arduino language reference I felt that its use here was
*    justified by the simplicity that it brings to this sketch.
*      That simplicity is provided by the two calls to isalpha(key) and isdigit(key).
*    The first one is used to decide if the key that was pressed is any letter from a-z
*    or A-Z and the second one decides if the key was any number from 0-9.  The return
*    value from these two functions is  either a zero or some positive number greater
*    than zero.  This makes it very simple to test a key and see if it is a number or
*    a letter.  So when you see the following:
*
*    if (isalpha(key))    // this is a letter key
*
*    then just remember that it is equivalent to:
*
*    if (isalpha(key) != 0)    // this is a letter key
*
*  And Finally…
*    To better understand how the event handler affects your code you will need to remember
*    that it only gets called when you press, release or hold a key.  And once you do then
*    the event handler runs at the full speed of the loop().
*
*
*  ******* THE KEYPAD REQUIRES PULL-UP RESISTORS ON THE ROW PINS. *******
*
*/

#include <Keypad.h>
#include <ctype.h>

// Define the keymaps.  The blank spot (lower left) is the space character.
char alphaKeys[4][3] = {
{ ‘a’,’d’,’g’ },
{ ‘j’,’m’,’p’ },
{ ‘s’,’v’,’y’ },
{ ‘ ‘,’.’,’#’ }
};

char numberKeys[4][3] = {
{ ‘1’,’2′,’3′ },
{ ‘4’,’5′,’6′ },
{ ‘7’,’8′,’9′ },
{ ‘ ‘,’0′,’#’ }
};
char buf[5];
char open[5]={‘1′,’2′,’3′,’4′,’5’};
char close[5]={‘5′,’4′,’3′,’2′,’1’};
boolean o=false;
boolean c=false;
boolean alpha = false;   // Start with the numeric keypad.

int i=0;
char* keypadMap = (alpha == true) ? makeKeymap(alphaKeys) : makeKeymap(numberKeys);

// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these pins, eg. ROW0 = Arduino pin2.
byte rowPins[] = { 5, 4, 3, 2 };

// Connect keypad COL0, COL1 and COL2 to these pins, eg. COL0 = Arduino pin6.
byte colPins[] = { 8, 7, 6 };

//create a new Keypad
Keypad keypad = Keypad(keypadMap, rowPins, colPins, sizeof(rowPins), sizeof(colPins));

const byte ledPin = 13;                                                     // Use the LED on pin 13.

void setup() {
Serial.begin(9600);
digitalWrite(ledPin, HIGH);                                                // Turns the LED on.
keypad.addEventListener(keypadEvent);                                      // Add an event listener.
keypad.setHoldTime(500);                                                   // Default is 1000mS
keypad.setDebounceTime(250);
// Default is 50mS
pinMode(ledPin,OUTPUT);
}

void loop() {
char key = keypad.getKey();

if (alpha) {                      // Flash the LED if we are using the letter keymap.
digitalWrite(ledPin,!digitalRead(ledPin));
delay(100);
}
}

// Take care of some special events.
void keypadEvent(KeypadEvent key) {
static char virtKey = NO_KEY;      // Stores the last virtual key press. (Alpha keys only)
static char physKey = NO_KEY;      // Stores the last physical key press. (Alpha keys only)
static char buildStr[12];
static byte buildCount;
static byte pressCount;

switch (keypad.getState())
{
case PRESSED:
if (isalpha(key)) {              // This is a letter key so we’re using the letter keymap.
if (physKey != key) {        // New key so start with the first of 3 characters.
pressCount = 0;
virtKey = key;
physKey = key;
}
else {                       // Pressed the same key again…
virtKey++;               // so select the next character on that key.
pressCount++;            // Tracks how many times we press the same key.
}
if (pressCount > 2) {        // Last character reached so cycle back to start.
pressCount = 0;
virtKey = key;
}
Serial.print(virtKey);       // Used for testing.
}
if (isdigit(key) || key == ‘ ‘ || key == ‘.’) {

//Serial.print(key);
buf[i]=key;
i++;

}
if (key == ‘#’) {

//Serial.println();
i=0;
Serial.println(buf);
for(int j=0;j<5;j++){
if(buf[j]==open[j]){o=true;}
else{o=false; break;}
}
for(int j=0;j<5;j++){
if(buf[j]==close[j]){c=true;}
else{c=false;break;}
}
if(o){digitalWrite(12,HIGH);digitalWrite(11,LOW);}
if(c){digitalWrite(12,LOW);digitalWrite(11,HIGH);}

}
break;

case HOLD:
if (key == ‘#’)  {                   // Toggle between keymaps.
if (alpha == true)  {            // We are currently using a keymap with letters
keypad.begin(*numberKeys);   // and want to change to numbers.
alpha = false;
}
else  {                          // Or, we are currently using a keymap with numbers
keypad.begin(*alphaKeys);    // and want to change to letters.
alpha = true;
}
}
else  {                             // Some key other than ‘#’ was pressed.
buildStr[buildCount++] = (isalpha(key)) ? virtKey : key;
buildStr[buildCount] = ”;
Serial.println();
Serial.println(buildStr);
}
break;

case RELEASED:
if (buildCount >= sizeof(buildStr))  buildCount = 0;    // Our string is full. Start fresh.
break;

}  // end switch-case
}  // end keypad events