Components needed for this circuit :
microcontroller board (Arduino compatible)
Step 1 : Go to library manager
Step 2 : Install Adafruit NeoPixel by Adafruit.
Step 3 : Add Adafruit NeoPixel library in your sketch if it's not already the case.
//----------------LIBRARIES----------------
// adafruit neopixel library
// find out more about library here: <https://adafruit.github.io/Adafruit_NeoPixel/html/class_adafruit___neo_pixel.html>
#include <Adafruit_NeoPixel.h>
//------------------WIRING------------------
// 5V -> 3.3V or 5V
// GND -> GND
// DI -> Digital pin 11
#define LED_PIN 11
//----------------VARIABLES----------------
// number of LEDs
#define LED_COUNT 12
// NeoPixel luminosity, 0 (min) to 255 (max)
#define BRIGHTNESS 20
// ----------OBJECTS DECLARATION-----------
// Declare neopixel Ring
Adafruit_NeoPixel ring(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
// Argument 1 = number of led
// Argument 2 = Pin
// Argument 3 = Pixel type
//This is how to declare var using RGB space for led ring
uint32_t red = ring.Color(255, 0, 0);
uint32_t purple = ring.Color(130, 0, 180);
uint32_t lightBlue = ring.Color(30, 30, 150);
void setup() {
// INITIALIZE NeoPixel ring object (REQUIRED)
ring.begin();
// Set BRIGHTNESS to about 1/10 (max = 255)
ring.setBrightness(BRIGHTNESS);
}
void loop() {
// Set all pixel colors to 'off'
ring.clear();
// Light a single led with a variable
ring.setPixelColor(0, red); // switch on led 1 in red (first led is 0)
// Light multiple leds with for loop
for(int i = 1; i < ring.numPixels(); i++){
ring.setPixelColor(i, purple);
}
ring.show(); // display modifications
delay(1000);
hulaHoop(lightBlue, 100);
turnColor(red, purple, 200);
}
// ------ Additional functions -------
void hulaHoop(uint32_t colorToDisplay, int speedForAnimation){
for(int j = 0; j < ring.numPixels(); j++){
ring.setPixelColor(j, colorToDisplay);
ring.show();
delay(speedForAnimation);
}
}
void turnColor(uint32_t backgroundColorToDisplay, uint32_t colorToDisplay, int speedForAnimation){
for(int j = 1; j < ring.numPixels()-1; j++){
ring.setPixelColor(j-1, backgroundColorToDisplay);
ring.setPixelColor(j, colorToDisplay);
ring.setPixelColor(j+1, colorToDisplay);
ring.show();
delay(speedForAnimation);
}
}