kopia lustrzana https://github.com/micropython/micropython
71 wiersze
1.9 KiB
ReStructuredText
71 wiersze
1.9 KiB
ReStructuredText
![]() |
Controlling NeoPixels
|
||
|
=====================
|
||
|
|
||
|
NeoPixels, also known as WS2812 LEDs, are full-colour LEDs that are connected in
|
||
|
serial, are individually addressable, and can have their red, green and blue
|
||
|
components set between 0 and 255. They require precise timing to control them
|
||
|
and there is a special neopixel module to do just this.
|
||
|
|
||
|
To create a NeoPixel object do the following::
|
||
|
|
||
|
>>> import machine, neopixel
|
||
|
>>> np = neopixel.NeoPixel(machine.Pin(4), 8)
|
||
|
|
||
|
This configures a NeoPixel strip on GPIO4 with 8 pixels. You can adjust the
|
||
|
"4" (pin number) and the "8" (number of pixel) to suit your set up.
|
||
|
|
||
|
To set the colour of pixels use::
|
||
|
|
||
|
>>> np[0] = (255, 0, 0) # set to red, full brightness
|
||
|
>>> np[1] = (0, 128, 0) # set to green, half brightness
|
||
|
>>> np[2] = (0, 0, 64) # set to blue, quarter brightness
|
||
|
|
||
|
Then use the ``write()`` method to output the colours to the LEDs::
|
||
|
|
||
|
>>> np.write()
|
||
|
|
||
|
The following demo function makes a fancy show on the LEDs::
|
||
|
|
||
|
import time
|
||
|
|
||
|
def demo(np):
|
||
|
n = np.n
|
||
|
|
||
|
# cycle
|
||
|
for i in range(4 * n):
|
||
|
for j in range(n):
|
||
|
np[j] = (0, 0, 0)
|
||
|
np[i % n] = (255, 255, 255)
|
||
|
np.write()
|
||
|
time.sleep_ms(25)
|
||
|
|
||
|
# bounce
|
||
|
for i in range(4 * n):
|
||
|
for j in range(n):
|
||
|
np[j] = (0, 0, 128)
|
||
|
if (i // n) % 2 == 0:
|
||
|
np[i % n] = (0, 0, 0)
|
||
|
else:
|
||
|
np[n - 1 - (i % n)] = (0, 0, 0)
|
||
|
np.write()
|
||
|
time.sleep_ms(60)
|
||
|
|
||
|
# fade in/out
|
||
|
for i in range(0, 4 * 256, 8):
|
||
|
for j in range(n):
|
||
|
if (i // 256) % 2 == 0:
|
||
|
val = i & 0xff
|
||
|
else:
|
||
|
val = 255 - (i & 0xff)
|
||
|
np[j] = (val, 0, 0)
|
||
|
np.write()
|
||
|
|
||
|
# clear
|
||
|
for i in range(n):
|
||
|
np[i] = (0, 0, 0)
|
||
|
np.write()
|
||
|
|
||
|
Execute it using::
|
||
|
|
||
|
>>> demo(np)
|