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strandtest.py
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strandtest.py
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#!/usr/bin/env python3
# NeoPixel library strandtest example
# Author: Tony DiCola (tony@tonydicola.com)
#
# Direct port of the Arduino NeoPixel library strandtest example. Showcases
# various animations on a strip of NeoPixels.
import time
from neopixel import *
import argparse
import random
# LED strip configuration:
LED_COUNT = 125 # Number of LED pixels.
LED_PIN = 18 # GPIO pin connected to the pixels (18 uses PWM!).
#LED_PIN = 10 # GPIO pin connected to the pixels (10 uses SPI /dev/spidev0.0).
LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
LED_DMA = 10 # DMA channel to use for generating signal (try 10)
LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
LED_CHANNEL = 0 # set to '1' for GPIOs 13, 19, 41, 45 or 53
# Define functions which animate LEDs in various ways.
def colorWipe(strip, color, wait_ms=50):
"""Wipe color across display a pixel at a time."""
for i in range(strip.numPixels()):
strip.setPixelColor(i, color)
strip.show()
time.sleep(wait_ms/1000.0)
def theaterChase(strip, color, wait_ms=50, iterations=10):
"""Movie theater light style chaser animation."""
for j in range(iterations):
for q in range(3):
for i in range(0, strip.numPixels(), 3):
strip.setPixelColor(i+q, color)
strip.show()
time.sleep(wait_ms/1000.0)
for i in range(0, strip.numPixels(), 3):
strip.setPixelColor(i+q, 0)
def wheel(pos):
"""Generate rainbow colors across 0-255 positions."""
if pos < 85:
return Color(pos * 3, 255 - pos * 3, 0)
elif pos < 170:
pos -= 85
return Color(255 - pos * 3, 0, pos * 3)
else:
pos -= 170
return Color(0, pos * 3, 255 - pos * 3)
def rainbow(strip, wait_ms=20, iterations=1):
"""Draw rainbow that fades across all pixels at once."""
for j in range(256*iterations):
for i in range(strip.numPixels()):
strip.setPixelColor(i, wheel((i+j) & 255))
strip.show()
time.sleep(wait_ms/1000.0)
def rainbowCycle(strip, wait_ms=20, iterations=5):
"""Draw rainbow that uniformly distributes itself across all pixels."""
for j in range(256*iterations):
for i in range(strip.numPixels()):
strip.setPixelColor(i, wheel((int(i * 256 / strip.numPixels()) + j) & 255))
strip.show()
time.sleep(wait_ms/1000.0)
def theaterChaseRainbow(strip, wait_ms=50):
"""Rainbow movie theater light style chaser animation."""
for j in range(256):
for q in range(3):
for i in range(0, strip.numPixels(), 3):
strip.setPixelColor(i+q, wheel((i+j) % 255))
strip.show()
time.sleep(wait_ms/1000.0)
for i in range(0, strip.numPixels(), 3):
strip.setPixelColor(i+q, 0)
def rain(strip, wait_s=0.075, iterations=25):
pickedNumbers = []
column = random.randint(0,24)
for x in range(iterations):
while column in pickedNumbers:
column = random.randint(0,24) #Stop the same collum getting choosen twice
pickedNumbers.append(column)
colour = Color(random.randint(0,255), random.randint(0,255), random.randint(0,255))
strip.setPixelColor(100 + column, colour)
strip.show()
time.sleep(wait_s)
for i in range(1,5):
strip.setPixelColor((100+column)-(25*i), colour)
strip.setPixelColor((100+column)-(25*(i-1)), Color(0,0,0))
strip.show()
time.sleep(wait_s)
def randfill(strip, wait_s=0.1):
pickedNumbers = []
light = random.randint(0,124)
colour = Color(255,255,255)
for x in range(25):
while light in pickedNumbers:
light = random.randint(0,124) #Stop the same collum getting choosen twice
pickedNumbers.append(light)
strip.setPixelColor(light, colour)
time.sleep(wait_s)
strip.show()
def randfill_top(strip, wait_s=0.05):
pickedNumbers = []
light = random.randint(0,24)
colour = Color(255,255,255)
for x in range(25):
while light in pickedNumbers:
light = random.randint(0,24) #Stop the same collum getting choosen twice
pickedNumbers.append(light)
strip.setPixelColor(light + 100, colour)
time.sleep(wait_s)
strip.show()
def stripClear(strip):
for i in range(LED_COUNT):
strip.setPixelColor(i, Color(0,0,0))
strip.show()
def singleColorWipe(strip, color, wait_ms=25):
strip.setPixelColor(0, color)
for i in range(1,strip.numPixels()):
strip.setPixelColor(i, color)
strip.setPixelColor(i-1, Color(0,0,0))
strip.show()
time.sleep(wait_ms/1000.0)
stripClear(strip)
def singleColorWipeDown(strip, color, wait_ms=500):
strip.setPixelColor(strip.numPixels(), color)
for i in range(strip.numPixels()-1, 0, -1):
strip.setPixelColor(i, color)
#strip.setPixelColor(i+1, Color(0,0,0))
strip.show()
time.sleep(wait_ms/1000.0)
# Main program logic follows:
if __name__ == '__main__':
# Process arguments
parser = argparse.ArgumentParser()
parser.add_argument('-c', '--clear', action='store_true', help='clear the display on exit')
args = parser.parse_args()
# Create NeoPixel object with appropriate configuration.
strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL)
# Intialize the library (must be called once before other functions).
strip.begin()
print ('Press Ctrl-C to quit.')
if not args.clear:
print('Use "-c" argument to clear LEDs on exit')
print(strip.numPixels())
try:
stripClear(strip)
while True:
singleColorWipe(strip, Color(255,0,0))
singleColorWipe(strip, Color(0,255,0))
singleColorWipe(strip, Color(0,0,255))
singleColorWipe(strip, Color(255,255,255))
randfill_top(strip)
time.sleep(1)
rain(strip)
time.sleep(1)
stripClear(strip)
time.sleep(1)
theaterChase(strip, Color(127, 127, 127)) # White theater chase
theaterChase(strip, Color(127, 0, 0)) # Red theater chase
theaterChase(strip, Color( 0, 0, 127)) # Blue theater chase
theaterChase(strip, Color( 0, 127, 0))
time.sleep(1)
stripClear(strip)
time.sleep(2)
colorWipe(strip, Color(255, 0, 0)) # Red wipe
colorWipe(strip, Color(0, 255, 0)) # Red wipe
colorWipe(strip, Color(0, 0, 255)) # Red wipe
time.sleep(1)
stripClear(strip)
time.sleep(1)
rainbowCycle(strip, wait_ms=200, iterations=1)
time.sleep(1)
stripClear(strip)
time.sleep(1)
except KeyboardInterrupt:
if args.clear:
colorWipe(strip, Color(0,0,0), 0.1)