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46 lines
1.0 KiB
Plaintext
46 lines
1.0 KiB
Plaintext
15 years ago
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/*
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For Loop Iteration
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Demonstrates the use of a for() loop.
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Lights multiple LEDs in sequence, then in reverse.
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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/ForLoop
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*/
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int timer = 100; // The higher the number, the slower the timing.
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void setup() {
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// use a for loop to initialize each pin as an output:
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for (int thisPin = 2; thisPin < 8; thisPin++) {
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pinMode(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 < 8; thisPin++) {
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// turn the pin on:
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digitalWrite(thisPin, HIGH);
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delay(timer);
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// turn the pin off:
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digitalWrite(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 = 7; thisPin >= 2; thisPin--) {
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// turn the pin on:
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digitalWrite(thisPin, HIGH);
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delay(timer);
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// turn the pin off:
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digitalWrite(thisPin, LOW);
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}
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}
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