LED_Light_Bar.ino

// Used with kind permission from
// Warwick A Smith, startingelectronics.com
// Knight rider display on 8 LEDs
void setup()
{
    for (int i = 2; i < 10; i++)
    {                       // Choose pins 2-9
        pinMode(i, OUTPUT); // Set the pins as outputs
    }
}
// Define function to turn off all LEDs at the same time
void allLEDsOff(void)
{
    for (int i = 2; i < 10; i++)
    {
        digitalWrite(i, LOW);
    }
}
// Switch on LEDs in sequence from left to right
void loop()
{
    for (int i = 2; i < 9; i++)
    {                          // Run loop once for each LED
        allLEDsOff();          // Turn off all LEDs
        digitalWrite(i, HIGH); // Turn on current LED
        delay(200);            // Delay of 200 ms,
        // then repeat loop to move on to next LED
    }
    for (int i = 9; i > 2; i--)
    { // Light LEDs from right to left
        allLEDsOff();
        digitalWrite(i, HIGH);
        delay(200);
    }
}