/* Charlieplexing example: 2 pins driving 2 LEDs with loops. */

#define SCAN_DELAY 500

byte LED_PINS[] = { 2, 3 };
const byte LED_PIN_COUNT = sizeof(LED_PINS);

void setup() {
}

void loop() {
  for (byte i = 0; i < LED_PIN_COUNT; i++) {
    for (byte j = 0; j < LED_PIN_COUNT; j++) {
      if (i != j) { //The LED port pins are always connected to two different pins
        pinMode(LED_PINS[i], OUTPUT); //port 2
        pinMode(LED_PINS[j], OUTPUT); //port 3
        digitalWrite(LED_PINS[i], LOW);
        digitalWrite(LED_PINS[j], HIGH);
        delay(SCAN_DELAY);
        pinMode(LED_PINS[i], INPUT);
        pinMode(LED_PINS[j], INPUT);
      }
    }
  }
}