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Change to reduce call to millis() by Paul Stoffregen

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This commit is contained in:
Tom Igoe 2010-02-09 03:48:57 +00:00
parent d72b7b5222
commit 3310d7c5aa
1 changed files with 10 additions and 7 deletions
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17
build/shared/examples/Digital/BlinkWithoutDelay/BlinkWithoutDelay.pde
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@ -4,7 +4,7 @@
pin, without using the delay() function. This means that other code
can run at the same time without being interrupted by the LED code.
The circuit:
The circuit:
* LED attached from pin 13 to ground.
* Note: on most Arduinos, there is already an LED on the board
that's attached to pin 13, so no hardware is needed for this example.
@ -12,8 +12,8 @@
created 2005
by David A. Mellis
modified 17 Jun 2009
by Tom Igoe
modified 8 Feb 2010
by Paul Stoffregen
http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
*/
@ -42,17 +42,20 @@ void loop()
// check to see if it's time to blink the LED; that is, is the difference
// between the current time and last time we blinked the LED bigger than
// the interval at which we want to blink the LED.
if (millis() - previousMillis > interval) {
unsigned long currentMillis = millis();
if(currentMillis - previousMillis > interval) {
// save the last time you blinked the LED
previousMillis = millis();
previousMillis = currentMillis;
// if the LED is off turn it on and vice-versa:
if (ledState == LOW)
ledState = HIGH;
else
ledState = LOW;
// set the LED with the ledState of the variable:
digitalWrite(ledPin, ledState);
}
}
}