Disco Light using LED Strip

My Daughter had a disco night to attend, so what could be better than equipped her with and LED Strip which will flash through the night and making it a blast.

It is also fortunate that the LED strip that I had order through Aliexpress arrived on time along with the Arduino Nano that I had ordered.

Ok, so lets go through the list of components that we need for this:

• Arduino Uno or nano
• 5 V addressable LED Strip (WS2812B)
• Switch
• Battery pack
• 330 Ω Resistor
• Cables
• Recycled belt or back pack strip

The LED strip consist of 3 wire, Positive, ground and the data wire. Connect the positive to the +5V on the Arduino, ground to the ground of Arduino and Data wire to the pin 3 of the arduino via 330 ohm resistor. Connect the +5V pin of Arduino to the power source via switch and the Ground cable is connected to the negative of the power pack as shown in the below picture:

Now open the Arduino IDE, and load the following code:

#include "FastLED.h"

FASTLED_USING_NAMESPACE

// FastLED "100-lines-of-code" demo reel, showing just a few 
// of the kinds of animation patterns you can quickly and easily 
// compose using FastLED. 
//
// This example also shows one easy way to define multiple 
// animations patterns and have them automatically rotate.
//
// -Mark Kriegsman, December 2014

#if defined(FASTLED_VERSION) && (FASTLED_VERSION < 3001000)
#warning "Requires FastLED 3.1 or later; check github for latest code."
#endif

#define DATA_PIN 3
//#define CLK_PIN 4
#define LED_TYPE WS2812B
#define COLOR_ORDER GRB
#define NUM_LEDS 30
CRGB leds[NUM_LEDS];

#define BRIGHTNESS 96
#define FRAMES_PER_SECOND 120

void setup() {
delay(3000); // 3 second delay for recovery

// tell FastLED about the LED strip configuration
FastLED.addLeds<LED_TYPE,DATA_PIN,COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
//FastLED.addLeds<LED_TYPE,DATA_PIN,CLK_PIN,COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);

// set master brightness control
FastLED.setBrightness(BRIGHTNESS);
}


// List of patterns to cycle through. Each is defined as a separate function below.
typedef void (*SimplePatternList[])();
SimplePatternList gPatterns = { rainbow, rainbowWithGlitter, confetti, sinelon, juggle, bpm };

uint8_t gCurrentPatternNumber = 0; // Index number of which pattern is current
uint8_t gHue = 0; // rotating "base color" used by many of the patterns

void loop()
{
// Call the current pattern function once, updating the 'leds' array
gPatterns[gCurrentPatternNumber]();

// send the 'leds' array out to the actual LED strip
FastLED.show(); 
// insert a delay to keep the framerate modest
FastLED.delay(1000/FRAMES_PER_SECOND);

// do some periodic updates
EVERY_N_MILLISECONDS( 20 ) { gHue++; } // slowly cycle the "base color" through the rainbow
EVERY_N_SECONDS( 10 ) { nextPattern(); } // change patterns periodically
}

#define ARRAY_SIZE(A) (sizeof(A) / sizeof((A)[0]))

void nextPattern()
{
// add one to the current pattern number, and wrap around at the end
gCurrentPatternNumber = (gCurrentPatternNumber + 1) % ARRAY_SIZE( gPatterns);
}

void rainbow() 
{
// FastLED's built-in rainbow generator
fill_rainbow( leds, NUM_LEDS, gHue, 7);
}

void rainbowWithGlitter() 
{
// built-in FastLED rainbow, plus some random sparkly glitter
rainbow();
addGlitter(80);
}

void addGlitter( fract8 chanceOfGlitter) 
{
if( random8() < chanceOfGlitter) {
leds[ random16(NUM_LEDS) ] += CRGB::White;
}
}

void confetti() 
{
// random colored speckles that blink in and fade smoothly
fadeToBlackBy( leds, NUM_LEDS, 10);
int pos = random16(NUM_LEDS);
leds[pos] += CHSV( gHue + random8(64), 200, 255);
}

void sinelon()
{
// a colored dot sweeping back and forth, with fading trails
fadeToBlackBy( leds, NUM_LEDS, 20);
int pos = beatsin16( 13, 0, NUM_LEDS-1 );
leds[pos] += CHSV( gHue, 255, 192);
}

void bpm()
{
// colored stripes pulsing at a defined Beats-Per-Minute (BPM)
uint8_t BeatsPerMinute = 62;
CRGBPalette16 palette = PartyColors_p;
uint8_t beat = beatsin8( BeatsPerMinute, 64, 255);
for( int i = 0; i < NUM_LEDS; i++) { //9948
leds[i] = ColorFromPalette(palette, gHue+(i*2), beat-gHue+(i*10));
}
}

void juggle() {
// eight colored dots, weaving in and out of sync with each other
fadeToBlackBy( leds, NUM_LEDS, 20);
byte dothue = 0;
for( int i = 0; i < 8; i++) {
leds[beatsin16( i+7, 0, NUM_LEDS-1 )] |= CHSV(dothue, 200, 255);
dothue += 32;
}
}

Upload the code to the Arduino and test it by flicking the switch to the “ON” position. You should now have a working disco light. The following video shows what it looks like: