const uint8_t LED_CNT = 5;

const uint8_t LED_PINS[LED_CNT] = {8, 9, 10, 11, 12};
const uint8_t BUTTON_PIN = 7;

const uint32_t INTERVAL = 1000;

uint32_t ms;
uint32_t last_ms;
uint32_t timeout;

bool run;
bool button;
bool button_old;
uint8_t actual_led;

void update_timeout(void)
{
	uint32_t diff_ms;

	ms = millis();
	
	diff_ms = (ms - last_ms);
	last_ms = ms;
	
	if (diff_ms > timeout)
		timeout = 0;
	else
		timeout -= diff_ms;
}

void setup()
{
	pinMode(BUTTON_PIN, INPUT_PULLUP);
	pinMode(LED_PINS[0], OUTPUT);
	pinMode(LED_PINS[1], OUTPUT);
	pinMode(LED_PINS[2], OUTPUT);
	pinMode(LED_PINS[3], OUTPUT);
	pinMode(LED_PINS[4], OUTPUT);

	button = digitalRead(BUTTON_PIN);
	button_old = button;
}

void loop()
{
	uint8_t i;
	
	update_timeout();
	
	button = digitalRead(BUTTON_PIN);
	
	if (!button && button_old)
	{
		if (run)
		{
			for (i=0; i<LED_CNT; i++)
				digitalWrite(LED_PINS[i], LOW);
		}
		else
		{
			actual_led = (LED_CNT - 1);
		}
		
		run = !run;
	}

	button_old = button;

	if (run && !timeout)
	{
		timeout = INTERVAL;
		
		digitalWrite(LED_PINS[actual_led], LOW);
		actual_led = (actual_led + 1) % LED_CNT;
		digitalWrite(LED_PINS[actual_led], HIGH);
	}
}