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authorPerry Hung <iperry@gmail.com>2011-01-24 23:23:29 -0500
committerPerry Hung <iperry@gmail.com>2011-01-24 23:23:29 -0500
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-.. _arduino-delay:
-
-delay()
-=======
-
-Description
------------
-
-Pauses the program for the amount of time (in miliseconds)
-specified as parameter. (There are 1000 milliseconds in a second.)
-
-
-
-Syntax
-------
-
-delay(ms)
-
-
-
-Parameters
-----------
-
-ms: the number of milliseconds to pause (*unsigned long*)
-
-
-
-Returns
--------
-
-nothing
-
-
-
-Example
--------
-
-::
-
- int ledPin = 13; // LED connected to digital pin 13
-
- void setup()
- {
- pinMode(ledPin, OUTPUT); // sets the digital pin as output
- }
-
- void loop()
- {
- digitalWrite(ledPin, HIGH); // sets the LED on
- delay(1000); // waits for a second
- digitalWrite(ledPin, LOW); // sets the LED off
- delay(1000); // waits for a second
- }
-
-
-
-Caveat
-------
-
-While it is easy to create a blinking LED with the delay()
-function, and many sketches use short delays for such tasks as
-switch debouncing, the use of delay() in a sketch has significant
-drawbacks. No other reading of sensors, mathematical calculations,
-or pin manipulation can go on during the delay function, so in
-effect, it brings most other activity to a halt. For alternative
-approaches to controlling timing see the
-`millis() <http://arduino.cc/en/Reference/Millis>`_ function and
-the sketch sited below. More knowledgeable programmers usually
-avoid the use of delay() for timing of events longer than 10's of
-milliseconds unless the Arduino sketch is very simple.
-
-
-
-Certain things *do* go on while the delay() function is controlling
-the Atmega chip however, because the delay function does not
-disable interrupts. Serial communication that appears at the RX pin
-is recorded, PWM
-(`analogWrite <http://arduino.cc/en/Reference/AnalogWrite>`_)
-values and pin states are maintained, and
-`interrupts <http://arduino.cc/en/Reference/AttachInterrupt>`_ will
-work as they should.
-
-
-
-See also
---------
-
-
-- `millis <http://arduino.cc/en/Reference/Millis>`_\ ()
-- `micros <http://arduino.cc/en/Reference/Micros>`_\ ()
-- `delayMicroseconds <http://arduino.cc/en/Reference/DelayMicroseconds>`_\ ()
-- `Blink Without Delay <http://arduino.cc/en/Tutorial/BlinkWithoutDelay>`_
- example
-