Arrays

1/*
2  Arrays
3*/
4
5int timer = 100;           // The higher the  number, the slower the timing.
6int ledPins[] = {
7  2, 7, 4, 6, 5, 3
8};       // an array of pin numbers to which LEDs are attached
9int pinCount = 6;           // the number of pins (i.e. the length of the array)
10
11void setup()  {
12  // the array elements are numbered from 0 to (pinCount - 1).
13  // use  a for loop to initialize each pin as an output:
14  for (int thisPin = 0; thisPin  < pinCount; thisPin++) {
15    pinMode(ledPins[thisPin], OUTPUT);
16  }
17}
18
19void  loop() {
20  // loop from the lowest pin to the highest:
21  for (int thisPin  = 0; thisPin < pinCount; thisPin++) {
22    // turn the pin on:
23    digitalWrite(ledPins[thisPin],  HIGH);
24    delay(timer);
25    // turn the pin off:
26    digitalWrite(ledPins[thisPin],  LOW);
27
28  }
29
30  // loop from the highest pin to the lowest:
31  for (int  thisPin = pinCount - 1; thisPin >= 0; thisPin--) {
32    // turn the pin on:
33    digitalWrite(ledPins[thisPin], HIGH);
34    delay(timer);
35    // turn the  pin off:
36    digitalWrite(ledPins[thisPin], LOW);
37  }
38}
39