Author: Shiyu Zhang

As a designer, I spend a lot of time coming up with ideas. And let’s be honest—sometimes they’re just shitty and trashy. So for Halloween, I’m literally wrapped in a trash bag, and on my head is a lightbulb, symbolizing those ‘aha’ moments… except this one’s got a glowing poop inside.

Material list:

Clear Ball Ornaments, 160mm/6.3inch

3D printed poop shaped shell (12x12x12cm, transparent PETG)

3D printed bulb holder (12x12x12cm, black PLA, spray painted in copper color)

XL trash bag (realized it’s still too small)

black leggings

Adafruit NeoPixel Digital RGB LED Strip

Gemma M0 board

button

Idea Sketches:

3D modeling:

Circuit Diagram:

 Arduino code:

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
 #include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif

#define BUTTON_PIN   2
#define PIXEL_PIN    1  
#define PIXEL_COUNT 78  

Adafruit_NeoPixel strip(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800);

boolean oldState = HIGH;
int     mode     = 0;    

void setup() {
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  strip.begin(); 
  strip.show();  
}

void colorWipe(uint32_t color, int wait) {
  for(int i=0; i<strip.numPixels(); i++) { 
    strip.setPixelColor(i, color);         
    strip.show();                          
    delay(wait);                           
  }
}

//mode3: offset orange blink
void orangeblink(int wait) {
  for (int offset = 0; offset < 3; offset++) {  // offset each 3 pixels
    strip.clear();  // clear all pixels
    for (int i = offset; i < strip.numPixels(); i += 3) {
      strip.setPixelColor(i, strip.Color(255, 165, 0)); // orange
    }
    strip.show(); // 
    delay(wait);  // 
  }
}

// Mode 4: Theater chase effect
void theaterChase(uint32_t color, int wait) {
  for (int a=0; a<10; a++) { // Repeat the chase effect
    for (int b=0; b<3; b++) { // 3 pixels lit per cycle
      strip.clear(); // Clear the pixels
      for (int c=0; c < strip.numPixels(); c+=3) {
        strip.setPixelColor(c+b, color); // Set every third pixel to the given color
      }
      strip.show(); // Update the strip
      delay(wait); // Wait before the next step
    }
  }
}

// mode5: rainbow
void rainbow(int wait) {
  for (long firstPixelHue = 0; firstPixelHue < 3*65536; firstPixelHue += 256) {
    for (int i = 0; i < strip.numPixels(); i++) {
      int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());
      strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
    }
    strip.show();
    delay(wait);
  }
}

void loop() {
  boolean newState = digitalRead(BUTTON_PIN);

// Check if state changed from high to low (button press).
  if((newState == LOW) && (oldState == HIGH)) {
    // Short delay to debounce button.
    delay(20);
    // Check if button is still low after debounce.
    newState = digitalRead(BUTTON_PIN);
    if(newState == LOW) {      // Yes, still low
      if(++mode > 10) mode = 0; // Advance to next mode, wrap around after #8
      switch(mode) {           // Start the new animation...
        case 0:
          colorWipe(strip.Color(  0,   0,   0), 50);    // Black/off
          break;
        case 1:
          orangeTheaterChase();
          break;
        case 2:
          fade(20);    
          break;
        case 3:
         theaterChase(strip.Color(255, 0, 0), 50); // red
          break;
        case 4:
         theaterChase(strip.Color(255, 255, 0), 50); // yellow
          break;
        case 5:
         theaterChase(strip.Color(0, 255, 0), 50); // green
          break;
        case 6:
         theaterChase(strip.Color(0, 0, 255), 50); // blue
          break;
        case 7:
         theaterChase(strip.Color(128, 0, 128), 50); // purple
          break;
        case 8:
          rainbow(10);
          break;
      }
    }
  }

oldState = newState;
}
  
//mode2: poop up, poop down
void orangeTheaterChase() {
  for (int repeat = 0; repeat < 2; repeat++) { // Repeat the effect twice
    // Gradually light up from the first to the last pixel
    for (int a = 0; a < strip.numPixels(); a++) {
      strip.clear();
      for (int b = 0; b <= a; b++) {
        strip.setPixelColor(b, strip.Color(255, 60, 0)); // Set color to orange
      }
      strip.show();
      delay(50);  // Delay between each pixel lighting up
    }

    // Gradually turn off from the last to the first pixel
    for (int a = strip.numPixels() - 1; a >= 0; a--) {
      strip.clear();
      for (int b = 0; b <= a; b++) {
        strip.setPixelColor(b, strip.Color(255, 60, 0)); // Keep color orange
      }
      strip.show();
      delay(50);  // Delay between each pixel turning off
    }
  }
}

// //mode3: fade 3 times with dif leds
void fade(int wait) {
  // int fadeTimes = 3;  
  // for (int t = 0; t < fadeTimes; t++) { 
    // light up
    for (int brightness = 0; brightness <= 255; brightness += 5) {
      strip.clear();
      for (int i = 0; i < strip.numPixels(); i += 3) {
        strip.setPixelColor(i, strip.Color((brightness * 255) / 255, (brightness * 80) / 255, 0)); 

      }
      strip.show();
      delay(wait);  
    }
    // turn down
    for (int brightness = 255; brightness >= 0; brightness -= 5) {
      strip.clear();
      for (int i = 0; i < strip.numPixels(); i += 3) {
        strip.setPixelColor(i, strip.Color((brightness * 255) / 255, (brightness * 80) / 255, 0)); 
      }
      strip.show();
      delay(wait);  
    }
    for (int brightness = 0; brightness <= 255; brightness += 5) {
      strip.clear();
      for (int i = 1; i < strip.numPixels(); i += 3) {
        strip.setPixelColor(i, strip.Color((brightness * 255) / 255, (brightness * 80) / 255, 0)); 

      }
      strip.show();
      delay(wait);  
    }
    // turn down
    for (int brightness = 255; brightness >= 0; brightness -= 5) {
      strip.clear();
      for (int i = 1; i < strip.numPixels(); i += 3) {
        strip.setPixelColor(i, strip.Color((brightness * 255) / 255, (brightness * 80) / 255, 0)); 
      }
      strip.show();
      delay(wait);  
    }

    for (int brightness = 0; brightness <= 255; brightness += 5) {
      strip.clear();
      for (int i = 2; i < strip.numPixels(); i += 3) {
        strip.setPixelColor(i, strip.Color((brightness * 255) / 255, (brightness * 80) / 255, 0)); 

      }
      strip.show();
      delay(wait);  
    }
    // turn down
    for (int brightness = 255; brightness >= 0; brightness -= 5) {
      strip.clear();
      for (int i = 2; i < strip.numPixels(); i += 3) {
        strip.setPixelColor(i, strip.Color((brightness * 255) / 255, (brightness * 80) / 255, 0)); 
      }
      strip.show();
      delay(wait);  
    }
  }

Light Result!