55 lines
1.5 KiB
Text
55 lines
1.5 KiB
Text
/*
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Arrays
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Demonstrates the use of an array to hold pin numbers
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in order to iterate over the pins in a sequence.
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Lights multiple LEDs in sequence, then in reverse.
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Unlike the For Loop tutorial, where the pins have to be
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contiguous, here the pins can be in any random order.
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The circuit:
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* LEDs from pins 2 through 7 to ground
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created 2006
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by David A. Mellis
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modified 5 Jul 2009
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by Tom Igoe
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http://www.arduino.cc/en/Tutorial/Array
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*/
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int timer = 100; // The higher the number, the slower the timing.
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int ledPins[] = {
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2, 7, 4, 6, 5, 3 }; // an array of pin numbers to which LEDs are attached
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int pinCount = 6; // the number of pins (i.e. the length of the array)
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void setup() {
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int thisPin;
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// the array elements are numbered from 0 to (pinCount - 1).
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// use a for loop to initialize each pin as an output:
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for (int thisPin = 0; thisPin < pinCount; thisPin++) {
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pinMode(ledPins[thisPin], OUTPUT);
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}
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}
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void loop() {
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// loop from the lowest pin to the highest:
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for (int thisPin = 0; thisPin < pinCount; thisPin++) {
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// turn the pin on:
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digitalWrite(ledPins[thisPin], HIGH);
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delay(timer);
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// turn the pin off:
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digitalWrite(ledPins[thisPin], LOW);
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}
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// loop from the highest pin to the lowest:
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for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) {
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// turn the pin on:
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digitalWrite(ledPins[thisPin], HIGH);
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delay(timer);
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// turn the pin off:
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digitalWrite(ledPins[thisPin], LOW);
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}
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}
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