I'm new to all of this, but it's there a way to group a cluster of pins to one variable? I don't necessarily want the grouped pounds to be sequential.

  • 1
    It's called an array.
    – Majenko
    Jul 6, 2016 at 13:09
  • Does it need to be byte form?
    – Erik
    Jul 6, 2016 at 13:11
  • An array can be made from any data type you like. Google "Arduino Arrays".
    – Majenko
    Jul 6, 2016 at 13:12
  • Can you be more specific as to what you wish to accomplish?
    – 001
    Jul 6, 2016 at 13:19
  • One example of a application I am considering is a grid of LEDs. I may wait to group some LEDs to look like constellations. I would like to have variables naming the constellations, that I can't turn on and off like a light switch.
    – Erik
    Jul 6, 2016 at 15:06

2 Answers 2


Only if you drop to low-level access, and only if the pins are on the same port.

#define pinset 0x55


PORTC |= pinset;
PORTC &= ~pinset;

In the example of the constellations, consider using an array for each constellation where each element in the array corresponds to an LED output pin. You could simply put a 1 or a 0 in each array element to indicate if you want the corresponding LED output pin on or off. It would be easy then to create a function that you would pass a constellation array and would turn the LED output pins on or off based on the contents of the array.

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