This interactive project is a lantern that changes color when it is shaken. The inspiration came from a video game character that I really like, and my interest in making a functioning item that has a purpose. The change of color is created by the circuit registering being shaken, which records the motion. 

Through the circuit playground, an LED strip is attached to a wooden dowel. The circuit is connected to a battery pack and set in a base created of foam. Wooden chopsticks are attached to the base and top to create the frame. Tissue paper is used to fill in the frame.

Initial project proposal:

A glowing lantern that when sensing either sound or movement will switch the color from purple to pink. 

List of Materials:

• Circuit playground
• Three double a batteries
• Batterie pack
• LED strip
• Wooden dowel
• Hot glue
• Thick sheet of foam
• Thin sheet of foam
• Tiny magnets
• Flat wooden chopsticks
• Thin wire
• Tissue paper

Code:

#include <Adafruit_CircuitPlayground.h>

#include <FastLED.h>

#include <Wire.h>

#include <SPI.h>

// — External strip —

#define STRIP_PIN    A2

#define STRIP_LEDS   30

#define LED_TYPE     WS2812B

#define COLOR_ORDER  GRB

CRGB stripLeds[STRIP_LEDS];

int sensorPin = A10;

int sensorValue = 0;

int brightVal = 20;

// — Color list: {red, green, blue} —

const uint8_t colors[][3] = {

 // {  0, 180, 255},   // cyan

  {  9,   9, 217},   // blue

 // {140,   0, 255},   // purple

  {252,   3, 82},   // hot pink

};

const int NUM_COLORS = sizeof(colors) / sizeof(colors[0]);

int colorIndex = 0;

// — Shake detection tuning —

const float SHAKE_THRESHOLD = 15.0;

const int   SHAKE_COOLDOWN  = 500;

unsigned long lastShakeTime = 0;

bool wasShaking = false;

void setup() {

  CircuitPlayground.begin();

  CircuitPlayground.clearPixels();

  CircuitPlayground.setBrightness(brightVal);

  FastLED.addLeds<LED_TYPE, STRIP_PIN, COLOR_ORDER>(stripLeds, STRIP_LEDS)

    .setDither(brightVal < 255);

  FastLED.setBrightness(brightVal);

  // Sanity flash: red on both outputs for 1 second

  fill_solid(stripLeds, STRIP_LEDS, CRGB::Red);

  FastLED.show();

  for (int i = 0; i < 10; i++) CircuitPlayground.setPixelColor(i, 255, 0, 0);

  CircuitPlayground.strip.show();

  delay(1000);

  fill_solid(stripLeds, STRIP_LEDS, CRGB::Black);

  FastLED.show();

  for (int i = 0; i < 10; i++) CircuitPlayground.setPixelColor(i, 0, 0, 0);

  CircuitPlayground.strip.show();

}

void setAllPixels(uint8_t r, uint8_t g, uint8_t b) {

  // CPX onboard 10 pixels

  for (int i = 0; i < 10; i++) {

    CircuitPlayground.strip.setPixelColor(i, r, g, b);

  }

  CircuitPlayground.strip.show();

  // External 30-pixel strip

  fill_solid(stripLeds, STRIP_LEDS, CRGB(r, g, b));

  FastLED.setBrightness(brightVal);

  FastLED.show();

}

void loop() {

  // Brightness from pot

  sensorValue = analogRead(sensorPin);

  brightVal = map(sensorValue, 0, 1023, 0, 225);

  CircuitPlayground.setBrightness(brightVal);

  // Shake detection

  float x = CircuitPlayground.motionX();

  float y = CircuitPlayground.motionY();

  float z = CircuitPlayground.motionZ();

  float magnitude = sqrt(x*x + y*y + z*z);

  float shakeForce = abs(magnitude – 9.8);

  unsigned long now = millis();

  if (shakeForce > SHAKE_THRESHOLD) {

    if (!wasShaking && (now – lastShakeTime > SHAKE_COOLDOWN)) {

      colorIndex = (colorIndex + 1) % NUM_COLORS;

      lastShakeTime = now;

    }

    wasShaking = true;

  } else {

    wasShaking = false;

  }

  setAllPixels(colors[colorIndex][0], colors[colorIndex][1], colors[colorIndex][2]);

}

How to:

1. Connect the LED strip & battery pack to the Circuit playground 
2. Create a base out of the thin foam that is big enough for the circuit and battery pack

3. Create a hole in the base to access the on and off switch. 
4. Create another base out of the thick foam. Align the magnets and attach to create a lid. 

5. Cut out four long rectangles of thick foam to add height to the base
6. Glue the LED strip to the wooden dowel
7. Glue the dowel with LED strip to the circuit

8. Create a second base to use as the top of the lamp
9. Cut and sand down nine chopsticks. Have six longer ones, with six shorter ones 

10. Attach the top onto the wooden dowel, and begin gluing the chopsticks to create the shape of the lantern

11. Once the lantern shape is completed. Begin gluing sections of the panels with tissue paper. Laying the paper flat and going one by one

12.  Cut out rectangles and strips of thin foam to cover up the base and exposed wooden chopsticks. Adding extra strips for decoration

13.  Bend metal wire to create a handle and stick it through the top

14. Turn on the LED from the bottom, and shake to change color.