First commit.

.pio/libdeps/local/FastLED/examples/Multiple/ArrayOfLedArrays/ArrayOfLedArrays.ino

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+// ArrayOfLedArrays - 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 three NEOPIXEL strips on three
+// different pins, each strip getting its own CRGB array to be played with, only this time they're going
+// to be all parts of an array of arrays.
+
+#include <FastLED.h>
+
+#define NUM_STRIPS 3
+#define NUM_LEDS_PER_STRIP 60
+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 10
+  FastLED.addLeds<NEOPIXEL, 10>(leds[0], NUM_LEDS_PER_STRIP);
+
+  // tell FastLED there's 60 NEOPIXEL leds on pin 11
+  FastLED.addLeds<NEOPIXEL, 11>(leds[1], NUM_LEDS_PER_STRIP);
+
+  // tell FastLED there's 60 NEOPIXEL leds on pin 12
+  FastLED.addLeds<NEOPIXEL, 12>(leds[2], NUM_LEDS_PER_STRIP);
+
+}
+
+void loop() {
+  // This outer loop will go over each strip, one at a time
+  for(int x = 0; x < NUM_STRIPS; x++) {
+    // This inner loop will go over each led in the current strip, one at a time
+    for(int i = 0; i < NUM_LEDS_PER_STRIP; i++) {
+      leds[x][i] = CRGB::Red;
+      FastLED.show();
+      leds[x][i] = CRGB::Black;
+      delay(100);
+    }
+  }
+}