Some functions to use colours from a colour wheel distributed across the neopixels.
from microbit import *
import math
import neopixel
# Initialise neopixels
npix = neopixel.NeoPixel(pin13, 12)
def LightAll(col):
for pix in range(0, len(npix)):
npix[pix] = col
npix.show()
def hsv_to_rgb(h, s, v):
if s == 0.0:
return (v, v, v)
i = int(h*6.0) # XXX assume int() truncates!
f = (h*6.0) - i
p = v*(1.0 - s)
q = v*(1.0 - s*f)
t = v*(1.0 - s*(1.0-f))
i = i%6
if i == 0:
return (v, t, p)
if i == 1:
return (q, v, p)
if i == 2:
return (p, v, t)
if i == 3:
return (p, q, v)
if i == 4:
return (t, p, v)
if i == 5:
return (v, p, q)
def MakeColour(h):
hsv = hsv_to_rgb(h,1,0.5)
r,g,b = hsv
return (math.floor(r*255),math.floor(g*255),math.floor(b*255))
def Rainbow(delay):
for pix in range(0, len(npix)):
npix[pix] = MakeColour(pix/(len(npix)-1))
npix.show()
sleep(delay)
def RainbowCycle(delay):
l = len(npix)
colours = [MakeColour(i/(l-1)) for i in range(0, l)]
for i in range(0, len(npix)):
x = [colours[(i + j) % l] for j in range(0,l)]
for pix in range(0,l):
npix[pix] = x[pix]
npix.show()
sleep(delay)
while True:
LightAll((128,0,0))
sleep(1000)
Rainbow(1000)
sleep(1000)
LightAll((128,0,0))
sleep(1000)
Rainbow(50)
for i in range(0,20):
RainbowCycle(150)
LightAll((128,0,0))
sleep(1000)
for i in range(0,1000):
RainbowCycle(20)
sleep(1000)
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