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39 lines
1.2 KiB
Plaintext
39 lines
1.2 KiB
Plaintext
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/* Blink without Delay
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*
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* Turns on and off a light emitting diode(LED) connected to a digital
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* pin, without using the delay() function. This means that other code
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* can run at the same time without being interrupted by the LED code.
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*
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* http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
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*/
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int ledPin = 13; // LED connected to digital pin 13
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int value = LOW; // previous value of the LED
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long previousMillis = 0; // will store last time LED was updated
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long interval = 1000; // interval at which to blink (milliseconds)
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void setup()
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{
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pinMode(ledPin, OUTPUT); // sets the digital pin as output
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}
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void loop()
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{
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// here is where you'd put code that needs to be running all the time.
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// check to see if it's time to blink the LED; that is, is the difference
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// between the current time and last time we blinked the LED bigger than
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// the interval at which we want to blink the LED.
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if (millis() - previousMillis > interval) {
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previousMillis = millis(); // remember the last time we blinked the LED
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// if the LED is off turn it on and vice-versa.
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if (value == LOW)
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value = HIGH;
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else
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value = LOW;
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digitalWrite(ledPin, value);
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}
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}
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