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test_led.py
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test_led.py
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#!/usr/bin/python3
# File name : LED.py
# Description : WS_2812
# Website : based on the code from https://github.com/rpi-ws281x/rpi-ws281x-python/blob/master/examples/strandtest.py
# E-mail : [email protected]
# Author : original code by Tony DiCola ([email protected])
# Date : 2019/02/23
import time
from rpi_ws281x import *
import argparse
# LED strip configuration:
LED_COUNT = 16 # Number of LED pixels.
LED_PIN = 12 # 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 LED:
def __init__(self):
self.LED_COUNT = 16 # Number of LED pixels.
self.LED_PIN = 12 # GPIO pin connected to the pixels (18 uses PWM!).
self.LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
self.LED_DMA = 10 # DMA channel to use for generating signal (try 10)
self.LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
self.LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
self.LED_CHANNEL = 0 # set to '1' for GPIOs 13, 19, 41, 45 or 53
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.
self.strip = Adafruit_NeoPixel(self.LED_COUNT, self.LED_PIN, self.LED_FREQ_HZ, self.LED_DMA, self.LED_INVERT, self.LED_BRIGHTNESS, self.LED_CHANNEL)
# Intialize the library (must be called once before other functions).
self.strip.begin()
# Define functions which animate LEDs in various ways.
def colorWipe(self, color, wait_ms=0):
"""Wipe color across display a pixel at a time."""
for i in range(self.strip.numPixels()):
self.strip.setPixelColor(i, color)
self.strip.show()
time.sleep(wait_ms/1000.0)
if __name__ == '__main__':
while True:
led = LED()
try:
led.colorWipe(Color(255,0,0))
time.sleep(3)
led.colorWipe(Color(0,255,0))
time.sleep(3)
led.colorWipe(Color(0,0,255))
time.sleep(3)
except KeyboardInterrupt:
print("=== Ctrl+C happened")
break
except:
print("=== Exception")
break
led.colorWipe(Color(0,0,0))
print("=== End.")