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Update code.py

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Change from using neopixel_spi to neopixel
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Anne Barela 2020-10-16 13:50:54 -04:00 committed by GitHub
parent 03a37a9b4d
commit c98362fe7b
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1 changed files with 18 additions and 24 deletions
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42
QT_Py_Bracelet/code.py
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@ -1,21 +1,15 @@
# Demo code to generate an alternating color-gradient effect in
# the QT Py LED cuff bracelet
# the QT Py LED cuff bracelet LEDs.
import time
import board
import neopixel_spi as neopixel
import neopixel
# Total number of LEDs on both strips
NUM_PIXELS = 14
# Using the neopixel_spi library because the LED strip signal uses the SPI bus. It
# would work just as well with the standard neopixel library. This particular code
# As written, this code doesnt require the faster speed of SPI, but it may prove useful
# if additional functionality is added, e.g. reading and responding to sensor inputs
spi = board.SPI()
pixels = neopixel.NeoPixel_SPI(
spi, NUM_PIXELS, pixel_order=neopixel.GRB, auto_write=False, brightness = 0.4
pixels = neopixel.NeoPixel(board.MOSI, NUM_PIXELS, pixel_order=neopixel.GRB, auto_write=False, brightness = 0.4
)
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.
@ -32,32 +26,32 @@ def wheel(pos):
# Scales a tuple by a fraction of 255
def scale(tup, frac):
return tuple((x*frac)//255 for x in tup)
# Sawtooth function with amplitude and period of 255
def sawtooth(x):
return int(2*(127.5 - abs((x % 255) - 127.5)))
#Hue value at the opposite side of the color wheel
# Hue value at the opposite side of the color wheel
def oppositeHue(x):
return ((x + 128) % 256)
hueIndex = 0 #determines hue value (0->255)
brightnessIndex = 0 #input to the sawtooth function for determining brightness (0->255)
brightnessSpeed = 3 #bigger value = faster shifts in brightness n
hueIndex = 0 # determines hue value (0->255)
brightnessIndex = 0 # input to the sawtooth function for determining brightness (0->255)
brightnessSpeed = 3 # bigger value = faster shifts in brightness
while True:
bright = sawtooth(brightnessIndex)
#get RGB color from wheel function and scale it by the brightness
# get RGB color from wheel function and scale it by the brightness
mainColor = scale(wheel(hueIndex),bright)
oppColor = scale(wheel(oppositeHue(hueIndex)), 255 - bright)
#hue and brightness alternate along each strip
# hue and brightness alternate along each strip
for i in range(NUM_PIXELS//2):
pixels[i*2] = mainColor
pixels[i*2 + 1] = oppColor
pixels.show()
#increment hue and brightness
# increment hue and brightness
hueIndex = (hueIndex + 1) % 255
brightnessIndex = (brightnessIndex + brightnessSpeed) % 255