22 ws2811 LEDs
1 Arduino Uno
connect green wire of LEDs to pin 5
connect red wire of LEDs to +5V
connect white wire of LEDs to GND
Connect USB cable to Arduino
Call up Arduino IDE software
select correct board (Tools/Board
select correct Port (COM 4 in my case)
verify and upload code:
all should work now
==================================================================
#include <FastLED.h>
#define LED_PIN 5
#define NUM_LEDS 22
#define LED_TYPE WS2811
#define COLOR_ORDER RGB
#define BRIGHTNESS 128
CRGB leds[NUM_LEDS];
const CRGB colours[] = {
CRGB::Red,
CRGB::Orange,
CRGB::Yellow,
CRGB::Green,
CRGB::Cyan,
CRGB::Blue,
CRGB::Purple
};
const uint8_t NUM_COLOURS = sizeof(colours) / sizeof(colours[0]);
const unsigned long FADE_TIME = 5000; // 5 seconds
uint8_t currentColour = 0;
unsigned long fadeStart;
void setup() {
FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
FastLED.setBrightness(BRIGHTNESS);
fadeStart = millis();
}
void loop() {
unsigned long elapsed = millis() - fadeStart;
// Calculate fade progress (0-255)
uint8_t blendAmount = (elapsed * 255UL) / FADE_TIME;
if (elapsed >= FADE_TIME) {
currentColour = (currentColour + 1) % NUM_COLOURS;
fadeStart = millis();
blendAmount = 0;
}
CRGB current = colours[currentColour];
CRGB next = colours[(currentColour + 1) % NUM_COLOURS];
CRGB blended = blend(current, next, blendAmount);
fill_solid(leds, NUM_LEDS, blended);
FastLED.show();
FastLED.delay(20); // ~50 FPS
}
==================================================================
