Simple test¶
Ensure your device works with this simple test.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | import time
import board
import neopixel
# On CircuitPlayground Express, and boards with built in status NeoPixel -> board.NEOPIXEL
# Otherwise choose an open pin connected to the Data In of the NeoPixel strip, i.e. board.D1
pixel_pin = board.NEOPIXEL
# On a Raspberry pi, use this instead, not all pins are supported
#pixel_pin = board.D18
# The number of NeoPixels
num_pixels = 10
# The order of the pixel colors - RGB or GRB. Some NeoPixels have red and green reversed!
# For RGBW NeoPixels, simply change the ORDER to RGBW or GRBW.
ORDER = neopixel.GRB
pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.2, auto_write=False,
pixel_order=ORDER)
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:
r = g = b = 0
elif pos < 85:
r = int(pos * 3)
g = int(255 - pos*3)
b = 0
elif pos < 170:
pos -= 85
r = int(255 - pos*3)
g = 0
b = int(pos*3)
else:
pos -= 170
r = 0
g = int(pos*3)
b = int(255 - pos*3)
return (r, g, b) if ORDER == neopixel.RGB or ORDER == neopixel.GRB else (r, g, b, 0)
def rainbow_cycle(wait):
for j in range(255):
for i in range(num_pixels):
pixel_index = (i * 256 // num_pixels) + j
pixels[i] = wheel(pixel_index & 255)
pixels.show()
time.sleep(wait)
while True:
# Comment this line out if you have RGBW/GRBW NeoPixels
pixels.fill((255, 0, 0))
# Uncomment this line if you have RGBW/GRBW NeoPixels
# pixels.fill((255, 0, 0, 0))
pixels.show()
time.sleep(1)
# Comment this line out if you have RGBW/GRBW NeoPixels
pixels.fill((0, 255, 0))
# Uncomment this line if you have RGBW/GRBW NeoPixels
# pixels.fill((0, 255, 0, 0))
pixels.show()
time.sleep(1)
# Comment this line out if you have RGBW/GRBW NeoPixels
pixels.fill((0, 0, 255))
# Uncomment this line if you have RGBW/GRBW NeoPixels
# pixels.fill((0, 0, 255, 0))
pixels.show()
time.sleep(1)
rainbow_cycle(0.001) # rainbow cycle with 1ms delay per step
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