Blink shirt LEDs with a sequence and timing that suggests a terminal cursor.

never_graduate.ino

#include <Adafruit_NeoPixel.h>

#define PIN 6
#define PIXELS 7
#define MAX_PERTURBATION 3
#define RANDOM_SOURCE 10

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXELS, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
 strip.begin();
 strip.show(); 
 
 randomSeed(analogRead(RANDOM_SOURCE));
}

void loop() {
   colorWipe(strip.Color(63, 63, 63), 5, 512);
   for(int i = 0; i < PIXELS; i++) {
    strip.setPixelColor(i, 0); 
   }
   strip.show();
}

uint16_t perturb(uint16_t value) {
  uint16_t amount; 
  amount = random(0, MAX_PERTURBATION);
  return value - amount;
}

uint16_t nextPixel(uint16_t pixel) {
 if (pixel < 2) return pixel+1;
 if (pixel == 2) return PIXELS - 1;
 if (pixel == 3) return 0;
 return pixel - 1;
}

// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint16_t cycle_wait, uint16_t cursor_wait) {
  int pixel = 0;
  do {
    strip.setPixelColor(pixel, c);
    strip.show();
    for(int i = 0; i < perturb(cycle_wait); i++) {
       //blink cursor
       strip.setPixelColor(pixel, 0);
       strip.show();
       delay(cursor_wait);
       strip.setPixelColor(pixel, c);
       strip.show();
       delay(cursor_wait);
    }
    pixel = nextPixel(pixel); 
  } while (pixel != 0);
}