Evening gents... Big Arduino and FastLED noob here.

Dewan_Brandt · July 29, 2018, 5:40pm

Evening gents… Big Arduino and FastLED noob here. I currently have 2 strips of LEDs running of 2 separate arduino pins. Everything works fine, but I want to control both of them as one big strip instead of having them mirror each other. Is this possible? Couldn’t find anything but if there has been a post about this please point me in that direction.
Thanks

Ben_Schattinger · July 29, 2018, 7:17pm

Check out the MultipleStripsInOneArray example.

github.com

FastLED/FastLED/blob/master/examples/Multiple/MultipleStripsInOneArray/MultipleStripsInOneArray.ino

// MultipleStripsInOneArray - see https://github.com/FastLED/FastLED/wiki/Multiple-Controller-Examples for more info on
// using multiple controllers.  In this example, we're going to set up four NEOPIXEL strips on three
// different pins, each strip will be referring to a different part of the single led array

#include <FastLED.h>

#define NUM_STRIPS 3
#define NUM_LEDS_PER_STRIP 60
#define NUM_LEDS NUM_LEDS_PER_STRIP * NUM_STRIPS

CRGB leds[NUM_STRIPS * NUM_LEDS_PER_STRIP];

// For mirroring strips, all the "special" stuff happens just in setup.  We
// just addLeds multiple times, once for each strip
void setup() {
  // tell FastLED there's 60 NEOPIXEL leds on pin 2, starting at index 0 in the led array
  FastLED.addLeds<NEOPIXEL, 2>(leds, 0, NUM_LEDS_PER_STRIP);

  // tell FastLED there's 60 NEOPIXEL leds on pin 3, starting at index 60 in the led array
  FastLED.addLeds<NEOPIXEL, 3>(leds, NUM_LEDS_PER_STRIP, NUM_LEDS_PER_STRIP);

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Ben_Schattinger · July 29, 2018, 7:18pm

Of course, if they are differently sized, you can change that. Just make your leds array be the total size, and make the second parameter to addLeds the offset.

Dewan_Brandt · July 29, 2018, 7:39pm

@Ben_Schattinger Thank you so much, i cant believe I completely missed it. Implemented and is working… at least until I forget what it does and bugger it up

Christopher_Gaul · July 29, 2018, 8:27pm

Just daisy chain them off one pin.