Update ReadMe.txt.

v1.0

ReadMe.txt

@@ -8,10 +8,10 @@ http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to Creative
 Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA.
 
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-Documentation is a work in progress.
-Please check back around mid-April.
-Thanks! ... jc
-25Mar2012
+Arduino library for debouncing and reading momentary contact switches like
+tactile button switches.  "Long presses" of arbitrary length can be detected.
+Works well in state machine constructs.  Use the read() function to read each
+button in the main loop, which should execute as fast as possible.
 
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 To use the library:
@@ -22,4 +22,88 @@ location on your PC.
 the files for the library, that has a name similar to "JChristensen-
 Button-42e98a7".
 (3) Rename the folder to just "Button".
-(4) Copy the renamed folder to the Arduino sketchbook\libraries folder.
+(4) Copy the renamed folder to the Arduino sketchbook\libraries folder.
+
+--------------------------------------------------------------------------------
+The following example sketches are included with the Timezone library:
+
+SimpleOnOff: Just turns the Arduino's pin 13 LED on and off.
+
+LongPress: Demonstrates detecting long and short button presses.
+
+UpDown: Counts up or down, one number at a time or rapidly by holding the button
+down.
+
+--------------------------------------------------------------------------------
+Declare button objects as follows.
+
+Button(pin, puEnable, invert, dbTime) instantiates a button object.
+
+Where:
+pin -- Is the Arduino pin the button is connected to,
+
+puEnable -- Enables the AVR internal pullup resistor if != 0 (can also use true
+or false),
+
+invert -- If invert == 0, a high state is interpreted as pressed, low as
+released. If invert != 0, a high state is interpreted as released, low as
+pressed (can also use true or false), and
+
+dbTime   Is the debounce time in milliseconds.
+
+Example. Wire a normally-open tactile button switch between Arduino pin 2 and
+ground.  We will use the internal pullup resistor, so the pin will be high when
+the button is not pressed, and low when the button is pressed.  Therefore we
+should use invert == true to invert the logic:
+
+Button myButton = Button(2, true, true, 25);
+
+--------------------------------------------------------------------------------
+The read() method reads the button and returns a boolean value (true or false)
+to indicate whether the button is pressed.  The read() function needs to execute
+very frequently in order for the sketch to be responsive.  A good place for
+read() is at the top of loop().  I don't normally use the return value from
+read(), because I use the other functions.
+
+Example:    myButton.read();
+
+--------------------------------------------------------------------------------
+The isPressed() and isReleased() functions check the button state when it was
+last read, and return false or true accordingly.  These functions DO NOT cause
+the button to be read.
+
+Example:    if ( myButton.isPressed ) {
+                //do some stuff
+            }
+            else {
+                //do some different stuff
+            }
+
+--------------------------------------------------------------------------------
+The wasPressed() and wasReleased() functions check the button state to see if it
+changed between the last two reads and return false or true accordingly.  These
+functions DO NOT cause the button to be read.  Note that these functions may be
+more useful than isPressed() and isReleased() since they actually detect a
+CHANGE in the state of the button, which is usually what we want in order to
+cause some action.
+
+Example:    if ( myButton.wasPressed() ) { ...
+
+--------------------------------------------------------------------------------
+The pressedFor(ms) and releasedFor(ms) functions check to see if the button is
+pressed (or released), and has been in that state for the specified time in
+milliseconds.  Returns false or true accordingly.  These functions are useful to
+detect "long presses".  Note that these functions DO NOT cause the button to be
+read.
+
+Example:    if (myButton.pressedFor(1000) {     //has button been pressed
+                                                //for one second?
+
+--------------------------------------------------------------------------------
+Under certain circumstances, it may be useful to know when a button last changed
+state.  lastChange() returns the time the button last changed state, in
+mlliseconds (the value is from the Arduino millis() function).
+
+Example:    unsigned long lastChange = myButton.lastChange();
+
+--------------------------------------------------------------------------------