38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
/*
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Blink without delay
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Turns on and off the built-in light emitting diode (LED), without
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using the delay() function. This means that other code can run at
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the same time without being interrupted by the LED code.
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created 2005
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by David A. Mellis
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modified 17 Jun 2009
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by Tom Igoe
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modified for Maple 27 May 2011
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by Marti Bolivar
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*/
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// Variables:
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int previousMillis = 0; // will store the last time the LED was updated
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int interval = 1000; // interval at which to blink (in milliseconds)
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void setup() {
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// Set up the built-in LED pin as output:
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pinMode(33, OUTPUT);
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}
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void loop() {
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// Check to see if it's time to blink the LED; that is, if the
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// difference between the current time and last time we blinked
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// the LED is bigger than the interval at which we want to blink
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// the LED.
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if (millis() - previousMillis > interval) {
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// Save the last time you blinked the LED
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previousMillis = millis();
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// If the LED is off, turn it on, and vice-versa:
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digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
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}
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}
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