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# CircuitPython demo - Dotstar
import time
import adafruit_dotstar
import board
num_pixels = 30
pixels = adafruit_dotstar.DotStar(board.A1, board.A2, num_pixels, brightness=0.1, auto_write=False)
def wheel(pos):
# Input a value 0 to 255 to get a color value.
# The colours are a transition r - g - b - back to r.
if pos < 0 or pos > 255:
return (0, 0, 0)
if pos < 85:
return (255 - pos * 3, pos * 3, 0)
if pos < 170:
pos -= 85
return (0, 255 - pos * 3, pos * 3)
pos -= 170
return (pos * 3, 0, 255 - pos * 3)
def color_fill(color, wait):
pixels.fill(color)
pixels.show()
time.sleep(wait)
def slice_alternating(wait):
pixels[::2] = [RED] * (num_pixels // 2)
pixels.show()
time.sleep(wait)
pixels[1::2] = [ORANGE] * (num_pixels // 2)
pixels.show()
time.sleep(wait)
pixels[::2] = [YELLOW] * (num_pixels // 2)
pixels.show()
time.sleep(wait)
pixels[1::2] = [GREEN] * (num_pixels // 2)
pixels.show()
time.sleep(wait)
pixels[::2] = [TEAL] * (num_pixels // 2)
pixels.show()
time.sleep(wait)
pixels[1::2] = [CYAN] * (num_pixels // 2)
pixels.show()
time.sleep(wait)
pixels[::2] = [BLUE] * (num_pixels // 2)
pixels.show()
time.sleep(wait)
pixels[1::2] = [PURPLE] * (num_pixels // 2)
pixels.show()
time.sleep(wait)
pixels[::2] = [MAGENTA] * (num_pixels // 2)
pixels.show()
time.sleep(wait)
pixels[1::2] = [WHITE] * (num_pixels // 2)
pixels.show()
time.sleep(wait)
def slice_rainbow(wait):
pixels[::6] = [RED] * (num_pixels // 6)
pixels.show()
time.sleep(wait)
pixels[1::6] = [ORANGE] * (num_pixels // 6)
pixels.show()
time.sleep(wait)
pixels[2::6] = [YELLOW] * (num_pixels // 6)
pixels.show()
time.sleep(wait)
pixels[3::6] = [GREEN] * (num_pixels // 6)
pixels.show()
time.sleep(wait)
pixels[4::6] = [BLUE] * (num_pixels // 6)
pixels.show()
time.sleep(wait)
pixels[5::6] = [PURPLE] * (num_pixels // 6)
pixels.show()
time.sleep(wait)
def rainbow_cycle(wait):
for j in range(255):
for i in range(num_pixels):
rc_index = (i * 256 // num_pixels) + j
pixels[i] = wheel(rc_index & 255)
pixels.show()
time.sleep(wait)
RED = (255, 0, 0)
YELLOW = (255, 150, 0)
ORANGE = (255, 40, 0)
GREEN = (0, 255, 0)
TEAL = (0, 255, 120)
CYAN = (0, 255, 255)
BLUE = (0, 0, 255)
PURPLE = (180, 0, 255)
MAGENTA = (255, 0, 20)
WHITE = (255, 255, 255)
while True:
# Change this number to change how long it stays on each solid color.
color_fill(RED, 0.5)
color_fill(YELLOW, 0.5)
color_fill(ORANGE, 0.5)
color_fill(GREEN, 0.5)
color_fill(TEAL, 0.5)
color_fill(CYAN, 0.5)
color_fill(BLUE, 0.5)
color_fill(PURPLE, 0.5)
color_fill(MAGENTA, 0.5)
color_fill(WHITE, 0.5)
# Increase or decrease this to speed up or slow down the animation.
slice_alternating(0.1)
color_fill(WHITE, 0.5)
# Increase or decrease this to speed up or slow down the animation.
slice_rainbow(0.1)
time.sleep(0.5)
# Increase this number to slow down the rainbow animation.
rainbow_cycle(0)
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