#!/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 revpimodio2
import time
from rpi_ws281x import PixelStrip, Color
import argparse
import neopixel
from time import sleep
from neopixel import *
from rpi_ws281x import PixelStrip, Color
import argparse
import board
outputformat = "PWM_{}"
revpi = revpimodio2.RevPiModIO(autorefresh=True)
# LED strip configuration:
LED_COUNT = 40 # Number of LED pixels.
LED_PIN = revpi.io.PWM_3.value # 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
class revPi():
def __init__(self):
self.out = [outputformat.format(x) for x in range(1, 5)]
self.revpi = revpimodio2.RevPiModIO(autorefresh=True)
# Define functions which animate LEDs in various ways.
def colorWipe(self, 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)
# 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 = PixelStrip(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()
root = revPi()
print('Press Ctrl-C to quit.')
if not args.clear:
print('Use "-c" argument to clear LEDs on exit')
try:
while True:
print('Color wipe animations.')
root.colorWipe(strip, Color(255, 0, 0)) # Red wipe
root.colorWipe(strip, Color(0, 255, 0)) # Green wipe
root.colorWipe(strip, Color(0, 0, 255)) # Blue wipe
except KeyboardInterrupt:
if args.clear:
root.colorWipe(strip, Color(0, 0, 0), 10)