Efeito Knight Rider com LEDs

1// ─────────────────────────────────────────
2//   BlueGrays · bluegrays.com
3//   Knight Rider LED Effect
4// ─────────────────────────────────────────
5// The 6 LEDs light up one by one forward, then backward (Knight Rider
6// effect). Shows bidirectional for loop logic.
7//
8// Pins:
9//   D2, D3, D4, D5, D6, D7 -> 6 LEDs (in order)
10//   Each LED with a 330 ohm resistor
11
12int ledPins[] = {2, 3, 4, 5, 6, 7};   // LED pins in lighting order
13
14void setup() {
15  // Set all LED pins as outputs
16  for(int i = 0; i < 6; i++) {
17    pinMode(ledPins[i], OUTPUT);
18  }
19}
20
21void loop() {
22  // Forward: D2 to D7, 100 ms per LED
23  for(int i = 0; i < 6; i++) {
24    digitalWrite(ledPins[i], HIGH);
25    delay(100);
26    digitalWrite(ledPins[i], LOW);
27  }
28
29  // Backward: D6 to D3. The end LEDs are skipped so the bounce looks seamless
30  for(int i = 4; i > 0; i--) {
31    digitalWrite(ledPins[i], HIGH);
32    delay(100);
33    digitalWrite(ledPins[i], LOW);
34  }
35}
36