| /* | |
| Arrays | |
| Demonstrates the use of an array to hold pin numbers in order to iterate over | |
| the pins in a sequence. Lights multiple LEDs in sequence, then in reverse. | |
| Unlike the For Loop tutorial, where the pins have to be contiguous, here the | |
| pins can be in any random order. | |
| The circuit: | |
| - LEDs from pins 2 through 7 to ground | |
| created 2006 | |
| by David A. Mellis | |
| modified 30 Aug 2011 | |
| by Tom Igoe | |
| This example code is in the public domain. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/Arrays | |
| */ | |
| int timer = 100; // The higher the number, the slower the timing. | |
| int ledPins[] = { | |
| 2, 7, 4, 6, 5, 3 | |
| }; // an array of pin numbers to which LEDs are attached | |
| int pinCount = 6; // the number of pins (i.e. the length of the array) | |
| void setup() { | |
| // the array elements are numbered from 0 to (pinCount - 1). | |
| // use a for loop to initialize each pin as an output: | |
| for (int thisPin = 0; thisPin < pinCount; thisPin++) { | |
| pinMode(ledPins[thisPin], OUTPUT); | |
| } | |
| } | |
| void loop() { | |
| // loop from the lowest pin to the highest: | |
| for (int thisPin = 0; thisPin < pinCount; thisPin++) { | |
| // turn the pin on: | |
| digitalWrite(ledPins[thisPin], HIGH); | |
| delay(timer); | |
| // turn the pin off: | |
| digitalWrite(ledPins[thisPin], LOW); | |
| } | |
| // loop from the highest pin to the lowest: | |
| for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) { | |
| // turn the pin on: | |
| digitalWrite(ledPins[thisPin], HIGH); | |
| delay(timer); | |
| // turn the pin off: | |
| digitalWrite(ledPins[thisPin], LOW); | |
| } | |
| } | |