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Merge pull request #5 from pimoroni/master
Added Pi 3 B+ support, compatibility with legacy examples, fixed rst readme
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‎README.md‎

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# RPi WS281x Python
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This is an unofficial Python distribution of the ws281x library: http://github.com/richardghirst/rpi_ws281x
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This is the official Python distribution of the ws281x library: http://github.com/richardghirst/rpi_ws281x
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It's intended to support the Unicorn HAT library, but can be used for driving other WS281x-based LED projects.
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# Installing
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### Based Upon rpi_ws281x
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## From pip
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`unicornhat` is based upon a modified, Pi 2/3 compatible version of the RPi ws281x Library by Jeremy Garff.
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Most users should simply run:
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The library was modified by Richard Hirst.
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* Modified version: https://github.com/richardghirst/rpi_ws281x
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* Original: https://github.com/jgarff/rpi_ws281x
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```
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sudo pip install rpi_ws281x
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```

‎examples/SK6812_lowlevel.py‎

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# Example of low-level Python wrapper for rpi_ws281x library.
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# Author: Tony DiCola ([email protected]), Jeremy Garff ([email protected])
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#
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# This is an example of how to use the SWIG-generated _rpi_ws281x module.
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# You probably don't want to use this unless you are building your own library,
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# because the SWIG generated module is clunky and verbose. Instead look at the
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# high level Python port of Adafruit's NeoPixel Arduino library in strandtest.py.
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#
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# This code will animate a number of WS281x LEDs displaying rainbow colors.
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import time
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import _rpi_ws281x as ws
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# LED configuration.
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LED_CHANNEL = 0
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LED_COUNT = 16 # How many LEDs to light.
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LED_FREQ_HZ = 800000 # Frequency of the LED signal. Should be 800khz or 400khz.
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LED_DMA_NUM = 10 # DMA channel to use, can be 0-14.
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LED_GPIO = 18 # GPIO connected to the LED signal line. Must support PWM!
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LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
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LED_INVERT = 0 # Set to 1 to invert the LED signal, good if using NPN
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# transistor as a 3.3V->5V level converter. Keep at 0
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# for a normal/non-inverted signal.
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#LED_STRIP = ws.WS2811_STRIP_RGB
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#LED_STRIP = ws.WS2811_STRIP_GBR
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#LED_STRIP = ws.SK6812_STRIP_RGBW
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LED_STRIP = ws.SK6812W_STRIP
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# Define colors which will be used by the example. Each color is an unsigned
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# 32-bit value where the lower 24 bits define the red, green, blue data (each
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# being 8 bits long).
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DOT_COLORS = [ 0x200000, # red
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0x201000, # orange
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0x202000, # yellow
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0x002000, # green
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0x002020, # lightblue
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0x000020, # blue
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0x100010, # purple
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0x200010 ] # pink
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# Create a ws2811_t structure from the LED configuration.
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# Note that this structure will be created on the heap so you need to be careful
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# that you delete its memory by calling delete_ws2811_t when it's not needed.
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leds = ws.new_ws2811_t()
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# Initialize all channels to off
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for channum in range(2):
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channel = ws.ws2811_channel_get(leds, channum)
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ws.ws2811_channel_t_count_set(channel, 0)
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ws.ws2811_channel_t_gpionum_set(channel, 0)
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ws.ws2811_channel_t_invert_set(channel, 0)
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ws.ws2811_channel_t_brightness_set(channel, 0)
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channel = ws.ws2811_channel_get(leds, LED_CHANNEL)
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ws.ws2811_channel_t_count_set(channel, LED_COUNT)
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ws.ws2811_channel_t_gpionum_set(channel, LED_GPIO)
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ws.ws2811_channel_t_invert_set(channel, LED_INVERT)
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ws.ws2811_channel_t_brightness_set(channel, LED_BRIGHTNESS)
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ws.ws2811_channel_t_strip_type_set(channel, LED_STRIP)
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ws.ws2811_t_freq_set(leds, LED_FREQ_HZ)
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ws.ws2811_t_dmanum_set(leds, LED_DMA_NUM)
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# Initialize library with LED configuration.
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resp = ws.ws2811_init(leds)
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if resp != ws.WS2811_SUCCESS:
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message = ws.ws2811_get_return_t_str(resp)
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raise RuntimeError('ws2811_init failed with code {0} ({1})'.format(resp, message))
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# Wrap following code in a try/finally to ensure cleanup functions are called
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# after library is initialized.
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try:
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offset = 0
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while True:
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# Update each LED color in the buffer.
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for i in range(LED_COUNT):
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# Pick a color based on LED position and an offset for animation.
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color = DOT_COLORS[(i + offset) % len(DOT_COLORS)]
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# Set the LED color buffer value.
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ws.ws2811_led_set(channel, i, color)
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# Send the LED color data to the hardware.
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resp = ws.ws2811_render(leds)
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if resp != ws.WS2811_SUCCESS:
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message = ws.ws2811_get_return_t_str(resp)
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raise RuntimeError('ws2811_render failed with code {0} ({1})'.format(resp, message))
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# Delay for a small period of time.
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time.sleep(0.25)
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# Increase offset to animate colors moving. Will eventually overflow, which
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# is fine.
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offset += 1
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finally:
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# Ensure ws2811_fini is called before the program quits.
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ws.ws2811_fini(leds)
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# Example of calling delete function to clean up structure memory. Isn't
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# strictly necessary at the end of the program execution here, but is good practice.
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ws.delete_ws2811_t(leds)

‎examples/SK6812_strandtest.py‎

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# NeoPixel library strandtest example
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# Author: Tony DiCola ([email protected])
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#
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# Direct port of the Arduino NeoPixel library strandtest example. Showcases
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# various animations on a strip of NeoPixels.
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import time
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from neopixel import *
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# LED strip configuration:
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LED_COUNT = 40 # Number of LED pixels.
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LED_PIN = 18 # GPIO pin connected to the pixels (must support PWM!).
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LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
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LED_DMA = 10 # DMA channel to use for generating signal (try 10)
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LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
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LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
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LED_CHANNEL = 0
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LED_STRIP = ws.SK6812_STRIP_RGBW
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#LED_STRIP = ws.SK6812W_STRIP
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# Define functions which animate LEDs in various ways.
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def colorWipe(strip, color, wait_ms=50):
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"""Wipe color across display a pixel at a time."""
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for i in range(strip.numPixels()):
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strip.setPixelColor(i, color)
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strip.show()
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time.sleep(wait_ms/1000.0)
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def theaterChase(strip, color, wait_ms=50, iterations=10):
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"""Movie theater light style chaser animation."""
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for j in range(iterations):
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for q in range(3):
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for i in range(0, strip.numPixels(), 3):
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strip.setPixelColor(i+q, color)
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strip.show()
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time.sleep(wait_ms/1000.0)
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for i in range(0, strip.numPixels(), 3):
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strip.setPixelColor(i+q, 0)
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def wheel(pos):
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"""Generate rainbow colors across 0-255 positions."""
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if pos < 85:
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return Color(pos * 3, 255 - pos * 3, 0)
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elif pos < 170:
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pos -= 85
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return Color(255 - pos * 3, 0, pos * 3)
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else:
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pos -= 170
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return Color(0, pos * 3, 255 - pos * 3)
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def rainbow(strip, wait_ms=20, iterations=1):
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"""Draw rainbow that fades across all pixels at once."""
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for j in range(256*iterations):
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for i in range(strip.numPixels()):
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strip.setPixelColor(i, wheel((i+j) & 255))
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strip.show()
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time.sleep(wait_ms/1000.0)
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def rainbowCycle(strip, wait_ms=20, iterations=5):
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"""Draw rainbow that uniformly distributes itself across all pixels."""
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for j in range(256*iterations):
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for i in range(strip.numPixels()):
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strip.setPixelColor(i, wheel(((i * 256 // strip.numPixels()) + j) & 255))
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strip.show()
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time.sleep(wait_ms/1000.0)
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def theaterChaseRainbow(strip, wait_ms=50):
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"""Rainbow movie theater light style chaser animation."""
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for j in range(256):
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for q in range(3):
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for i in range(0, strip.numPixels(), 3):
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strip.setPixelColor(i+q, wheel((i+j) % 255))
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strip.show()
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time.sleep(wait_ms/1000.0)
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for i in range(0, strip.numPixels(), 3):
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strip.setPixelColor(i+q, 0)
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# Main program logic follows:
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if __name__ == '__main__':
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# Create NeoPixel object with appropriate configuration.
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strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL, LED_STRIP)
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# Intialize the library (must be called once before other functions).
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strip.begin()
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print ('Press Ctrl-C to quit.')
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while True:
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# Color wipe animations.
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colorWipe(strip, Color(255, 0, 0)) # Red wipe
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colorWipe(strip, Color(0, 255, 0)) # Blue wipe
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colorWipe(strip, Color(0, 0, 255)) # Green wipe
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colorWipe(strip, Color(0, 0, 0, 255)) # White wipe
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colorWipe(strip, Color(255, 255, 255)) # Composite White wipe
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colorWipe(strip, Color(255, 255, 255, 255)) # Composite White + White LED wipe
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# Theater chase animations.
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theaterChase(strip, Color(127, 0, 0)) # Red theater chase
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theaterChase(strip, Color(0, 127, 0)) # Green theater chase
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theaterChase(strip, Color(0, 0, 127)) # Blue theater chase
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theaterChase(strip, Color(0, 0, 0, 127)) # White theater chase
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theaterChase(strip, Color(127, 127, 127, 0)) # Composite White theater chase
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theaterChase(strip, Color(127, 127, 127, 127)) # Composite White + White theater chase
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# Rainbow animations.
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rainbow(strip)
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rainbowCycle(strip)
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theaterChaseRainbow(strip)

‎examples/SK6812_white_test.py‎

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# NeoPixel library strandtest example
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# Author: Tony DiCola ([email protected])
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#
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# Direct port of the Arduino NeoPixel library strandtest example. Showcases
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# various animations on a strip of NeoPixels.
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import time
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from neopixel import *
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# LED strip configuration:
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LED_COUNT = 30 # Number of LED pixels.
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LED_PIN = 18 # GPIO pin connected to the pixels (must support PWM!).
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LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
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LED_DMA = 10 # DMA channel to use for generating signal (try 10)
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LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
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LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
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LED_CHANNEL = 0
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#LED_STRIP = ws.SK6812_STRIP_RGBW
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LED_STRIP = ws.SK6812W_STRIP
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# Define functions which animate LEDs in various ways.
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def colorWipe(strip, color, wait_ms=50):
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"""Wipe color across display a pixel at a time."""
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for i in range(strip.numPixels()):
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strip.setPixelColor(i, color)
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strip.show()
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time.sleep(wait_ms/1000.0)
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# Main program logic follows:
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if __name__ == '__main__':
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# Create NeoPixel object with appropriate configuration.
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strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL, LED_STRIP)
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# Intialize the library (must be called once before other functions).
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strip.begin()
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print ('Press Ctrl-C to quit.')
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while True:
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# Color wipe animations.
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colorWipe(strip, Color(255, 0, 0), 0) # Red wipe
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time.sleep(2)
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colorWipe(strip, Color(0, 255, 0), 0) # Blue wipe
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time.sleep(2)
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colorWipe(strip, Color(0, 0, 255), 0) # Green wipe
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time.sleep(2)
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colorWipe(strip, Color(0, 0, 0, 255), 0) # White wipe
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time.sleep(2)
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colorWipe(strip, Color(255, 255, 255), 0) # Composite White wipe
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time.sleep(2)
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colorWipe(strip, Color(255, 255, 255, 255), 0) # Composite White + White LED wipe
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time.sleep(2)

‎examples/lowlevel.py‎

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# Example of low-level Python wrapper for rpi_ws281x library.
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# Author: Tony DiCola ([email protected]), Jeremy Garff ([email protected])
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#
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# This is an example of how to use the SWIG-generated _rpi_ws281x module.
5+
# You probably don't want to use this unless you are building your own library,
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# because the SWIG generated module is clunky and verbose. Instead look at the
7+
# high level Python port of Adafruit's NeoPixel Arduino library in strandtest.py.
8+
#
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# This code will animate a number of WS281x LEDs displaying rainbow colors.
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import time
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import _rpi_ws281x as ws
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# LED configuration.
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LED_CHANNEL = 0
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LED_COUNT = 16 # How many LEDs to light.
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LED_FREQ_HZ = 800000 # Frequency of the LED signal. Should be 800khz or 400khz.
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LED_DMA_NUM = 10 # DMA channel to use, can be 0-14.
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LED_GPIO = 18 # GPIO connected to the LED signal line. Must support PWM!
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LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
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LED_INVERT = 0 # Set to 1 to invert the LED signal, good if using NPN
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# transistor as a 3.3V->5V level converter. Keep at 0
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# for a normal/non-inverted signal.
24+
25+
# Define colors which will be used by the example. Each color is an unsigned
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# 32-bit value where the lower 24 bits define the red, green, blue data (each
27+
# being 8 bits long).
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DOT_COLORS = [ 0x200000, # red
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0x201000, # orange
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0x202000, # yellow
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0x002000, # green
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0x002020, # lightblue
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0x000020, # blue
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0x100010, # purple
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0x200010 ] # pink
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# Create a ws2811_t structure from the LED configuration.
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# Note that this structure will be created on the heap so you need to be careful
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# that you delete its memory by calling delete_ws2811_t when it's not needed.
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leds = ws.new_ws2811_t()
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# Initialize all channels to off
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for channum in range(2):
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channel = ws.ws2811_channel_get(leds, channum)
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ws.ws2811_channel_t_count_set(channel, 0)
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ws.ws2811_channel_t_gpionum_set(channel, 0)
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ws.ws2811_channel_t_invert_set(channel, 0)
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ws.ws2811_channel_t_brightness_set(channel, 0)
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channel = ws.ws2811_channel_get(leds, LED_CHANNEL)
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ws.ws2811_channel_t_count_set(channel, LED_COUNT)
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ws.ws2811_channel_t_gpionum_set(channel, LED_GPIO)
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ws.ws2811_channel_t_invert_set(channel, LED_INVERT)
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ws.ws2811_channel_t_brightness_set(channel, LED_BRIGHTNESS)
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ws.ws2811_t_freq_set(leds, LED_FREQ_HZ)
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ws.ws2811_t_dmanum_set(leds, LED_DMA_NUM)
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# Initialize library with LED configuration.
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resp = ws.ws2811_init(leds)
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if resp != ws.WS2811_SUCCESS:
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message = ws.ws2811_get_return_t_str(resp)
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raise RuntimeError('ws2811_init failed with code {0} ({1})'.format(resp, message))
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# Wrap following code in a try/finally to ensure cleanup functions are called
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# after library is initialized.
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try:
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offset = 0
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while True:
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# Update each LED color in the buffer.
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for i in range(LED_COUNT):
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# Pick a color based on LED position and an offset for animation.
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color = DOT_COLORS[(i + offset) % len(DOT_COLORS)]
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# Set the LED color buffer value.
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ws.ws2811_led_set(channel, i, color)
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# Send the LED color data to the hardware.
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resp = ws.ws2811_render(leds)
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if resp != ws.WS2811_SUCCESS:
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message = ws.ws2811_get_return_t_str(resp)
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raise RuntimeError('ws2811_render failed with code {0} ({1})'.format(resp, message))
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# Delay for a small period of time.
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time.sleep(0.25)
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# Increase offset to animate colors moving. Will eventually overflow, which
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# is fine.
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offset += 1
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finally:
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# Ensure ws2811_fini is called before the program quits.
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ws.ws2811_fini(leds)
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# Example of calling delete function to clean up structure memory. Isn't
97+
# strictly necessary at the end of the program execution here, but is good practice.
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ws.delete_ws2811_t(leds)

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