const int NUM_SOLS = 5;
const int SOL_PINS[NUM_SOLS] = {6, 5, 4, 3, 2};
const unsigned long INTERVAL = 2000;

const bool solSeq[][NUM_SOLS] = { // Solenoid 1, 2, 3, 4, 5
  {0, 0, 0, 0, 0}, {1, 0, 0, 0, 0}, {0, 1, 0, 0, 0}, {1, 1, 0, 0, 0},
  {0, 0, 1, 0, 0}, {1, 0, 1, 0, 0}, {0, 1, 1, 0, 0}, {1, 1, 1, 0, 0},
  {0, 0, 0, 1, 0}, {1, 0, 0, 1, 0}, {0, 1, 0, 1, 0}, {1, 1, 0, 1, 0},
  {0, 0, 1, 1, 0}, {1, 0, 1, 1, 0}, {0, 1, 1, 1, 0}, {1, 1, 1, 1, 0}
};

int index = 0;
unsigned long lastTime = 0;

void setup() {
  Serial.begin(115200);
  for (int pin = 0; pin < NUM_SOLS; pin++) {
    pinMode(SOL_PINS[pin], OUTPUT);
  }
}

void loop() {
  if (millis() - lastTime >= INTERVAL)  {
    lastTime = millis();
    Serial.println(index);
    for (int pin = 0; pin < NUM_SOLS; pin++)  {
      digitalWrite(SOL_PINS[pin], solSeq[index][pin]);
    }
    index++;
    if (index >= 16) index = 0;
  }
}