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fading.py
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fading.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# -----------------------------------------------------
# File fading.py
# Authors David Ordnung
# License GPLv3
# Web http://dordnung.de/raspberrypi-ledstrip/
# -----------------------------------------------------
#
# Copyright (C) 2014-2017 David Ordnung
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>
#
# This script needs running pigpio (http://abyz.co.uk/rpi/pigpio/)
###### CONFIGURE THIS ######
# The Pins. Use Broadcom numbers.
RED_PIN = 17
GREEN_PIN = 27
BLUE_PIN = 22
# Number of color changes per step (more is faster, less is slower).
# You also can use 0.X floats.
STEPS = 0.02
###### END ######
import pigpio
bright = 255
r = 255.0
g = 0.0
b = 0.0
pi = pigpio.pi()
def updateColor(color, step):
color += step
if color > 255:
return 255
if color < 0:
return 0
return color
def setLights(pin, brightness):
realBrightness = int(int(brightness) * (float(bright) / 255.0))
pi.set_PWM_dutycycle(pin, realBrightness)
setLights(RED_PIN, r)
setLights(GREEN_PIN, g)
setLights(BLUE_PIN, b)
while True:
if r == 255 and b == 0 and g < 255:
g = updateColor(g, STEPS)
setLights(GREEN_PIN, g)
elif g == 255 and b == 0 and r > 0:
r = updateColor(r, -STEPS)
setLights(RED_PIN, r)
elif r == 0 and g == 255 and b < 255:
b = updateColor(b, STEPS)
setLights(BLUE_PIN, b)
elif r == 0 and b == 255 and g > 0:
g = updateColor(g, -STEPS)
setLights(GREEN_PIN, g)
elif g == 0 and b == 255 and r < 255:
r = updateColor(r, STEPS)
setLights(RED_PIN, r)
elif r == 255 and g == 0 and b > 0:
b = updateColor(b, -STEPS)
setLights(BLUE_PIN, b)