stillness.ino

const int numPins = 12;
const int pins[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13};

const int motionSensePin = A0;

void setup() {
  for (int i = 0; i < numPins; ++i) {
    pinMode(pins[i], OUTPUT);
  }
  pinMode(motionSensePin, INPUT);
}

int litPin = 0;
unsigned long lastSecond = 0;

boolean systemOn = false;
unsigned long lastMotionDetected = 0;

void startClock() {
  systemOn = true;
  lastSecond = millis();
  litPin = 0;
  digitalWrite(pins[0], HIGH);
  for (int i = 1; i < numPins; ++i) {
    digitalWrite(pins[i], LOW);
  }
}

void loop() {
  if (digitalRead(motionSensePin) == LOW) {
    lastMotionDetected = millis();
    if (! systemOn) {
      startClock();
    }
  }
  if (millis() < lastMotionDetected || 
      millis() - lastMotionDetected > 10 * 60 * 1000) { // 10 min * 60 s/min * 1000 ms/s
    systemOn = false;
  }

  if (systemOn) {
    if (millis() < lastSecond || millis() - lastSecond > 1000) {
      digitalWrite(pins[litPin], LOW);
      litPin = (litPin + 1) % numPins;
      digitalWrite(pins[litPin], HIGH);

      lastSecond = millis();
    }
  } else {
    for (int i = 0; i < numPins; ++i) {
      digitalWrite(pins[i], LOW);
    }
  }
}