Overview
Things
Story

Instructions

Published October 7, 2021 © MIT

Crystal RGB

Glowing RGB crystal

IntermediateFull instructions provided4 hours603

Things used in this project

Hardware components

Micro-USB Digispark compatible board

WS2812B addressable RGB LED

USB-A to Micro-USB Cable

Machine Screw, M3

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

3D Printer (generic)

Hot glue gun (generic)

Story

3D printed RGB desk ornament in the shape of a crystal. I found a pretty design on Thingiverse and wanted to put an RGB LED in it.

Instructions:

3D print the crystal base from Thingiverse. After this is done, start printing the crystal itself and while it's doing that we will assemble the electronics in the base.
Use two M3 screws to fix the Digispark to the 3D printed base. You might have to use a little force.

Hot glue the LED to the base. Align the LED's marked corner to the bottom right, like in the image.

Solder a short wire from the LED's input pin to P0 on the Digispark. Try to keep all wires around the LED, as the crystal will come on top of this component and there will not be a lot of space for loose wires.

Solder another wire from the LED's GND pin (marked with the triangle) to GND on the Digispark.
Also remove small power LED on Digispark board (close to the 5V connection on the board) as it is too bright and will interfere with our light show.

Solder the power pin of the LED to 5V on the Digispark.

Time to test the circuit! Follow the instructions on the Digistump website on how to install the appropriate software for connecting to the board https://digistump.com/wiki/digispark/tutorials/connecting
Once you confirmed the connection, proceed to write to your board the Arduino sketch in this project. You should be greeted with a rather bright LED cycling through colors.

Test if the crystal fits on top of your base. You may need to rearrange the wires to get everything to fit nicely.

Hot glue the two parts together and enjoy!

Schematics

Code

#include <Adafruit_NeoPixel.h>

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

#define PIXELPIN          0

Adafruit_NeoPixel strip = Adafruit_NeoPixel(1, PIXELPIN, NEO_GRB + NEO_KHZ800);

void setup() {
  // put your setup code here, to run once:
  
  strip.begin();
  strip.clear();
  strip.show();

}

void loop() {
  // put your main code here, to run repeatedly:
  static uint8_t i = 0;

  strip.setPixelColor(0, Wheel(i));
  strip.show();
  delay(20);
  i++;
}


uint32_t Wheel(byte WheelPos) {
  WheelPos = 255 - WheelPos;
  if(WheelPos < 85) {
    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  }
  if(WheelPos < 170) {
    WheelPos -= 85;
    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
  WheelPos -= 170;
  return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}

#include <Adafruit_NeoPixel.h>

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

#define PIXELPIN          0


#define R   30
#define G   80
#define B   220

Adafruit_NeoPixel strip = Adafruit_NeoPixel(1, PIXELPIN, NEO_GRB + NEO_KHZ800);

void setup() {
  // put your setup code here, to run once:
  
  strip.begin();
  strip.clear();
  strip.show();

}

void loop() {
  // put your main code here, to run repeatedly:
  static uint8_t i = 0;
  static uint8_t dir = 0;
  uint16_t r, g, b;

  r = R * cos(i * DEG_TO_RAD);
  g = G * cos(i * DEG_TO_RAD);
  b = B * cos(i * DEG_TO_RAD);

  strip.setPixelColor(0, r, g, b);
  strip.show();
  delay(20);

  if (i == 60) dir = 1;
  if (i == 0) dir = 0;
  
  if (dir == 0) i++;
  else i--;
}

Credits

mihai.cuciuc

2 projects • 0 followers

Contact

Thanks to https://www.thingiverse.com/JustinSDK.

Comments

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Crystal RGB

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Instructions:

Custom parts and enclosures

3D models

CrystalBase

Crystal

Schematics

Wiring diagram

Code

Arduino sketch

Arduino Minerals sketch

Credits

mihai.cuciuc

Comments

Embed the widget on your own site

Crystal RGB

Crystal RGB

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Instructions:

Custom parts and enclosures

3D models

CrystalBase

Crystal

Schematics

Wiring diagram

Code

Arduino sketch

Arduino Minerals sketch

Credits

mihai.cuciuc

Comments

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