diff options
author | Marti Bolivar <mbolivar@mit.edu> | 2010-10-20 06:46:52 -0400 |
---|---|---|
committer | Marti Bolivar <mbolivar@mit.edu> | 2010-10-20 06:46:52 -0400 |
commit | 85c1c72db022bba891868afd3375e39dbe245701 (patch) | |
tree | 9d86a3db825667362a8c89a98a205586015aec94 /source/arduino/delay.rst | |
parent | abcfcc62cc62dfc088d30d5a6b6c36d6c89f7b07 (diff) | |
download | librambutan-85c1c72db022bba891868afd3375e39dbe245701.tar.gz librambutan-85c1c72db022bba891868afd3375e39dbe245701.zip |
initial check-in of arduino docs in RST format (converted using wget+pandoc)
Diffstat (limited to 'source/arduino/delay.rst')
-rw-r--r-- | source/arduino/delay.rst | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/source/arduino/delay.rst b/source/arduino/delay.rst new file mode 100644 index 0000000..973c75b --- /dev/null +++ b/source/arduino/delay.rst @@ -0,0 +1,94 @@ +.. _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 + |