Add effect: Fade

[darthf1]

Hi, I would really love to use an effect to fade from color1 to color2, and even better would be to face from color1 with brightness1, to color2 with brightness2 in X number of steps.

How could i best achieve this effect? It could look very much like this

[tateu]

In Python, how about:

import time
from neopixel import *

# LED strip configuration:
LED_COUNT      = 60      # Number of LED pixels.
LED_PIN        = 18      # GPIO pin connected to the pixels (must support PWM!).
LED_FREQ_HZ    = 800000  # LED signal frequency in hertz (usually 800khz)
LED_DMA        = 5       # DMA channel to use for generating signal (try 5)
LED_BRIGHTNESS = 255     # Set to 0 for darkest and 255 for brightest
LED_INVERT     = False   # True to invert the signal (when using NPN transistor level shift)
LED_CHANNEL    = 0
LED_STRIP = ws.SK6812_STRIP_GRBW

def fade(r1,g1,b1,w1, r2,g2,b2,w2, steps,interval):
    lastUpdate = time.time() - interval

    for i in range(1, steps + 1):
        r = ((r1 * (steps - i)) + (r2 * i)) / steps
        g = ((g1 * (steps - i)) + (g2 * i)) / steps
        b = ((b1 * (steps - i)) + (b2 * i)) / steps
        w = ((w1 * (steps - i)) + (w2 * i)) / steps

        while ((time.time() - lastUpdate) < interval):
            pass

        # print("{: 3d} ({:0.3f}s): {:03d}, {:03d}, {:03d}, {:03d}".format(i, time.time() - lastUpdate, r, g, b, w))
        color = Color(r, g, b, w)
        for j in range(strip.numPixels()):
            strip.setPixelColor(j, color)
        strip.show()

        lastUpdate = time.time()

strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL, LED_STRIP)
strip.begin()

fade(255,0,0,0, 10,255,0,0, 40,0.025)

[darthf1]

Wow this looks great! Im going to try tonight, ill let you know the outcome.

[jgarff]

Closing issue due to inactivity.