Knight rider effect

In our example of creating a knight rider effect with some LEDs you will require the following parts.

Now build the circuit as follows

multiple leds schematic

Code

int pinArray[] = {2, 3, 4, 5, 6, 7,8,9};
int count = 0;
int timer = 100;

void setup()
{
for (count=0;count<8;count++)
{
pinMode(pinArray[count], OUTPUT);
}
}

void loop()
{
for (count=0;count<8;count++)
{
digitalWrite(pinArray[count], HIGH);
delay(timer);
digitalWrite(pinArray[count], LOW);
delay(timer);
}
for (count=7;count>=0;count–)
{
digitalWrite(pinArray[count], HIGH);
delay(timer);
digitalWrite(pinArray[count], LOW);
delay(timer);
}
}