Init commit with many years of arduino sketches and projects. I dont know if the esp8266 includes much, but there are also libraries. I hope they dont have crazy automatic versioning through the Arduino IDE.

Projects/libraries/Installed_libs/Keypad/examples/CustomKeypad/CustomKeypad.ino

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+/* @file CustomKeypad.pde
+|| @version 1.0
+|| @author Alexander Brevig
+|| @contact alexanderbrevig@gmail.com
+||
+|| @description
+|| | Demonstrates changing the keypad size and key values.
+|| #
+*/
+#include <Keypad.h>
+
+const byte ROWS = 4; //four rows
+const byte COLS = 4; //four columns
+//define the cymbols on the buttons of the keypads
+char hexaKeys[ROWS][COLS] = {
+  {'0','1','2','3'},
+  {'4','5','6','7'},
+  {'8','9','A','B'},
+  {'C','D','E','F'}
+};
+byte rowPins[ROWS] = {3, 2, 1, 0}; //connect to the row pinouts of the keypad
+byte colPins[COLS] = {7, 6, 5, 4}; //connect to the column pinouts of the keypad
+
+//initialize an instance of class NewKeypad
+Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 
+
+void setup(){
+  Serial.begin(9600);
+}
+  
+void loop(){
+  char customKey = customKeypad.getKey();
+  
+  if (customKey){
+    Serial.println(customKey);
+  }
+}

Projects/libraries/Installed_libs/Keypad/examples/DynamicKeypad/DynamicKeypad.ino

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+/* @file   DynamicKeypad.pde
+|| @version 1.2
+|| @author Mark Stanley
+|| @contact mstanley@technologist.com
+||
+||  07/11/12 - Re-modified (from DynamicKeypadJoe2) to use direct-connect kpds
+||  02/28/12 - Modified to use I2C i/o G. D. (Joe) Young
+||
+||
+|| @dificulty:  Intermediate
+||
+|| @description
+|| |    This is a demonstration of keypadEvents. It's used 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 is 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 tests to see if your key was a letter
+|| |
+|| |    And the following may be more familiar to some but it is equivalent:
+|| |
+|| |    if (isalpha(key) != 0)   // this tests to see if your key was a letter
+|| |
+|| |  And Finally...
+|| |    To better understand how the event handler affects your code you will need to remember
+|| |    that it gets called only when you press, hold or release a key.  However, once a key
+|| |    is pressed or held then the event handler gets called at the full speed of the loop().
+|| |
+|| #
+*/
+#include <Keypad.h>
+#include <ctype.h>
+
+const byte ROWS = 4; //four rows
+const byte COLS = 3; //three columns
+// Define the keymaps.  The blank spot (lower left) is the space character.
+char alphaKeys[ROWS][COLS] = {
+    { 'a','d','g' },
+    { 'j','m','p' },
+    { 's','v','y' },
+    { ' ','.','#' }
+};
+
+char numberKeys[ROWS][COLS] = {
+    { '1','2','3' },
+    { '4','5','6' },
+    { '7','8','9' },
+    { ' ','0','#' }
+};
+
+boolean alpha = false;   // Start with the numeric keypad.
+
+byte rowPins[ROWS] = {5, 4, 3, 2}; //connect to the row pinouts of the keypad
+byte colPins[COLS] = {8, 7, 6}; //connect to the column pinouts of the keypad
+
+// Create two new keypads, one is a number pad and the other is a letter pad.
+Keypad numpad( makeKeymap(numberKeys), rowPins, colPins, sizeof(rowPins), sizeof(colPins) );
+Keypad ltrpad( makeKeymap(alphaKeys), rowPins, colPins, sizeof(rowPins), sizeof(colPins) );
+
+
+unsigned long startTime;
+const byte ledPin = 13;                            // Use the LED on pin 13.
+
+void setup() {
+    Serial.begin(9600);
+    pinMode(ledPin, OUTPUT);
+    digitalWrite(ledPin, LOW);                 // Turns the LED on.
+    ltrpad.begin( makeKeymap(alphaKeys) );
+    numpad.begin( makeKeymap(numberKeys) );
+    ltrpad.addEventListener(keypadEvent_ltr);  // Add an event listener.
+    ltrpad.setHoldTime(500);                   // Default is 1000mS
+    numpad.addEventListener(keypadEvent_num);  // Add an event listener.
+    numpad.setHoldTime(500);                   // Default is 1000mS
+}
+
+char key;
+
+void loop() {
+
+    if( alpha )
+        key = ltrpad.getKey( );
+    else
+        key = numpad.getKey( );
+
+    if (alpha && millis()-startTime>100) {           // Flash the LED if we are using the letter keymap.
+        digitalWrite(ledPin,!digitalRead(ledPin));
+        startTime = millis();
+    }
+}
+
+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;
+
+static byte kpadState;
+
+// Take care of some special events.
+
+void keypadEvent_ltr(KeypadEvent key) {
+    // in here when in alpha mode.
+    kpadState = ltrpad.getState( );
+    swOnState( key );
+} // end ltrs keypad events
+
+void keypadEvent_num( KeypadEvent key ) {
+    // in here when using number keypad
+    kpadState = numpad.getState( );
+    swOnState( key );
+} // end numbers keypad events
+
+void swOnState( char key ) {
+    switch( kpadState ) {
+        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);
+                if (key == '#')
+                    Serial.println();
+                break;
+
+        case HOLD:
+            if (key == '#')  {               // Toggle between keymaps.
+                if (alpha == true)  {        // We are currently using a keymap with letters
+                    alpha = false;           // Now we want a keymap with numbers.
+                    digitalWrite(ledPin, LOW);
+                }
+                else  {                      // We are currently using a keymap with numbers
+                    alpha = true;            // Now we want a keymap with letters.
+                }
+            }
+            else  {                          // Some key other than '#' was pressed.
+                buildStr[buildCount++] = (isalpha(key)) ? virtKey : key;
+                buildStr[buildCount] = '\0';
+                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 switch on state function
+

Projects/libraries/Installed_libs/Keypad/examples/EventKeypad/EventKeypad.ino

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+/* @file EventSerialKeypad.pde
+ || @version 1.0
+ || @author Alexander Brevig
+ || @contact alexanderbrevig@gmail.com
+ ||
+ || @description
+ || | Demonstrates using the KeypadEvent.
+ || #
+ */
+#include <Keypad.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] = {5, 4, 3, 2}; //connect to the row pinouts of the keypad
+byte colPins[COLS] = {8, 7, 6}; //connect to the column pinouts of the keypad
+
+Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
+byte ledPin = 13; 
+
+boolean blink = false;
+boolean ledPin_state;
+
+void setup(){
+    Serial.begin(9600);
+    pinMode(ledPin, OUTPUT);              // Sets the digital pin as output.
+    digitalWrite(ledPin, HIGH);           // Turn the LED on.
+    ledPin_state = digitalRead(ledPin);   // Store initial LED state. HIGH when LED is on.
+    keypad.addEventListener(keypadEvent); // Add an event listener for this keypad
+}
+
+void loop(){
+    char key = keypad.getKey();
+
+    if (key) {
+        Serial.println(key);
+    }
+    if (blink){
+        digitalWrite(ledPin,!digitalRead(ledPin));    // Change the ledPin from Hi2Lo or Lo2Hi.
+        delay(100);
+    }
+}
+
+// Taking care of some special events.
+void keypadEvent(KeypadEvent key){
+    switch (keypad.getState()){
+    case PRESSED:
+        if (key == '#') {
+            digitalWrite(ledPin,!digitalRead(ledPin));
+            ledPin_state = digitalRead(ledPin);        // Remember LED state, lit or unlit.
+        }
+        break;
+
+    case RELEASED:
+        if (key == '*') {
+            digitalWrite(ledPin,ledPin_state);    // Restore LED state from before it started blinking.
+            blink = false;
+        }
+        break;
+
+    case HOLD:
+        if (key == '*') {
+            blink = true;    // Blink the LED when holding the * key.
+        }
+        break;
+    }
+}

Projects/libraries/Installed_libs/Keypad/examples/HelloKeypad/HelloKeypad.ino

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+/* @file HelloKeypad.pde
+|| @version 1.0
+|| @author Alexander Brevig
+|| @contact alexanderbrevig@gmail.com
+||
+|| @description
+|| | Demonstrates the simplest use of the matrix Keypad library.
+|| #
+*/
+#include <Keypad.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] = {5, 4, 3, 2}; //connect to the row pinouts of the keypad
+byte colPins[COLS] = {8, 7, 6}; //connect to the column pinouts of the keypad
+
+Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
+
+void setup(){
+  Serial.begin(9600);
+}
+  
+void loop(){
+  char key = keypad.getKey();
+  
+  if (key){
+    Serial.println(key);
+  }
+}

Projects/libraries/Installed_libs/Keypad/examples/HelloKeypad3/HelloKeypad3.ino

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+#include <Keypad.h>
+
+
+const byte ROWS = 2; // use 4X4 keypad for both instances
+const byte COLS = 2;
+char keys[ROWS][COLS] = {
+  {'1','2'},
+  {'3','4'}
+};
+byte rowPins[ROWS] = {5, 4}; //connect to the row pinouts of the keypad
+byte colPins[COLS] = {7, 6}; //connect to the column pinouts of the keypad
+Keypad kpd( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
+
+
+const byte ROWSR = 2;
+const byte COLSR = 2;
+char keysR[ROWSR][COLSR] = {
+  {'a','b'},
+  {'c','d'}
+};
+byte rowPinsR[ROWSR] = {3, 2}; //connect to the row pinouts of the keypad
+byte colPinsR[COLSR] = {7, 6}; //connect to the column pinouts of the keypad
+Keypad kpdR( makeKeymap(keysR), rowPinsR, colPinsR, ROWSR, COLSR );
+
+
+const byte ROWSUR = 4;
+const byte COLSUR = 1;
+char keysUR[ROWSUR][COLSUR] = {
+  {'M'},
+  {'A'},
+  {'R'},
+  {'K'}
+};
+// Digitran keypad, bit numbers of PCF8574 i/o port
+byte rowPinsUR[ROWSUR] = {5, 4, 3, 2}; //connect to the row pinouts of the keypad
+byte colPinsUR[COLSUR] = {8}; //connect to the column pinouts of the keypad
+
+Keypad kpdUR( makeKeymap(keysUR), rowPinsUR, colPinsUR, ROWSUR, COLSUR );
+
+
+void setup(){
+//  Wire.begin( );
+  kpdUR.begin( makeKeymap(keysUR) );
+  kpdR.begin( makeKeymap(keysR) );
+  kpd.begin( makeKeymap(keys) );
+  Serial.begin(9600);
+  Serial.println( "start" );
+}
+
+//byte alternate = false;
+char key, keyR, keyUR;
+void loop(){
+
+//  alternate = !alternate;
+  key = kpd.getKey( );
+  keyUR = kpdUR.getKey( );
+  keyR = kpdR.getKey( );
+
+  if (key){
+    Serial.println(key);
+  }
+  if( keyR ) {
+    Serial.println( keyR );
+  }
+  if( keyUR ) {
+    Serial.println( keyUR );
+  }
+}

Projects/libraries/Installed_libs/Keypad/examples/MultiKey/MultiKey.ino

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+/* @file MultiKey.ino
+|| @version 1.0
+|| @author Mark Stanley
+|| @contact mstanley@technologist.com
+||
+|| @description
+|| | The latest version, 3.0, of the keypad library supports up to 10
+|| | active keys all being pressed at the same time. This sketch is an
+|| | example of how you can get multiple key presses from a keypad or
+|| | keyboard.
+|| #
+*/
+
+#include <Keypad.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] = {5, 4, 3, 2}; //connect to the row pinouts of the kpd
+byte colPins[COLS] = {8, 7, 6}; //connect to the column pinouts of the kpd
+
+Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
+
+unsigned long loopCount;
+unsigned long startTime;
+String msg;
+
+
+void setup() {
+    Serial.begin(9600);
+    loopCount = 0;
+    startTime = millis();
+    msg = "";
+}
+
+
+void loop() {
+    loopCount++;
+    if ( (millis()-startTime)>5000 ) {
+        Serial.print("Average loops per second = ");
+        Serial.println(loopCount/5);
+        startTime = millis();
+        loopCount = 0;
+    }
+
+    // Fills kpd.key[ ] array with up-to 10 active keys.
+    // Returns true if there are ANY active keys.
+    if (kpd.getKeys())
+    {
+        for (int i=0; i<LIST_MAX; i++)   // Scan the whole key list.
+        {
+            if ( kpd.key[i].stateChanged )   // Only find keys that have changed state.
+            {
+                switch (kpd.key[i].kstate) {  // Report active key state : IDLE, PRESSED, HOLD, or RELEASED
+                    case PRESSED:
+                    msg = " PRESSED.";
+                break;
+                    case HOLD:
+                    msg = " HOLD.";
+                break;
+                    case RELEASED:
+                    msg = " RELEASED.";
+                break;
+                    case IDLE:
+                    msg = " IDLE.";
+                }
+                Serial.print("Key ");
+                Serial.print(kpd.key[i].kchar);
+                Serial.println(msg);
+            }
+        }
+    }
+}  // End loop

Projects/libraries/Installed_libs/Keypad/examples/loopCounter/loopCounter.ino

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+#include <Keypad.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] = {5, 4, 3, 2}; //connect to the row pinouts of the keypad
+byte colPins[COLS] = {8, 7, 6}; //connect to the column pinouts of the keypad
+
+Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
+
+unsigned long loopCount = 0;
+unsigned long timer_t = 0;
+
+void setup(){
+	Serial.begin(9600);
+	
+	// Try playing with different debounceTime settings to see how it affects
+	// the number of times per second your loop will run. The library prevents
+	// setting it to anything below 1 millisecond.
+	kpd.setDebounceTime(10);	// setDebounceTime(mS)
+}
+
+void loop(){
+	char key = kpd.getKey();
+	
+	// Report the number of times through the loop in 1 second. This will give
+	// you a relative idea of just how much the debounceTime has changed the
+	// speed of your code. If you set a high debounceTime your loopCount will
+	// look good but your keypresses will start to feel sluggish.
+	if ((millis() - timer_t) > 1000) {
+		Serial.print("Your loop code ran ");
+		Serial.print(loopCount);
+		Serial.println(" times over the last second");
+		loopCount = 0;
+		timer_t = millis();
+	}
+	loopCount++;
+	if(key)
+		Serial.println(key);
+}