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node-red-nodes/hardware/neopixel/neopix.py
2016-01-13 19:59:30 +00:00

154 lines
5.5 KiB
Python
Executable File

#!/usr/bin/python
#
# Copyright 2016 IBM Corp.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Import library functions we need
import sys
import time
from neopixel import *
# LED strip configuration:
LED_COUNT = 8 # Number of LED pixels.
LED_PIN = 18 # GPIO pin connected to the pixels (must support PWM!).
LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
LED_DMA = 5 # DMA channel to use for generating signal (try 5)
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)
if sys.version_info >= (3,0):
print("Sorry - currently only configured to work with python 2.x")
sys.exit(1)
LED_COUNT = int(sys.argv[1])
WAIT_MS = int(sys.argv[2])
MODE = sys.argv[3]
def getRGBfromI(RGBint):
blue = RGBint & 255
green = (RGBint >> 8) & 255
red = (RGBint >> 16) & 255
return red, green, blue
# Define functions which animate LEDs in various ways.
def setPixel(strip, i, color):
"""Set a single pixel"""
strip.setPixelColor(i, color)
strip.show()
def setPixels(strip, s, e, color, wait_ms=30):
"""Set pixels from s(tart) to e(nd)"""
for i in range(s, e+1):
strip.setPixelColor(i, color)
strip.show()
time.sleep(wait_ms/1000.0)
def colorWipe(strip, color, wait_ms=30):
"""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 shiftUp(strip, color, wait_ms=30):
"""Shift all pixels one way."""
oldcolour = strip.getPixelColor(0)
strip.setPixelColor(0, color)
strip.show()
time.sleep(wait_ms/1000.0)
for i in range(1,LED_COUNT):
newcolour = oldcolour
oldcolour = strip.getPixelColor(i)
strip.setPixelColor(i, newcolour)
strip.show()
time.sleep(wait_ms/1000.0)
def shiftDown(strip, color, wait_ms=30):
"""Shift all pixels the other way."""
oldcolour = strip.getPixelColor(LED_COUNT-1)
strip.setPixelColor(LED_COUNT-1, color)
strip.show()
time.sleep(wait_ms/1000.0)
for i in range(LED_COUNT-2,-1,-1):
newcolour = oldcolour
oldcolour = strip.getPixelColor(i)
strip.setPixelColor(i, newcolour)
strip.show()
time.sleep(wait_ms/1000.0)
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=2):
"""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=2):
"""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(((i * 256 / strip.numPixels()) + j) & 255))
strip.show()
time.sleep(wait_ms/1000.0)
# Main loop:
if __name__ == '__main__':
# Create NeoPixel object with appropriate configuration.
strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS)
# Intialize the library (must be called once before other functions).
strip.begin()
## Color wipe animations.
colorWipe(strip, Color(127, 0, 0), WAIT_MS) # Red wipe
colorWipe(strip, Color(0, 127, 0), WAIT_MS) # Green wipe
colorWipe(strip, Color(0, 0, 127), WAIT_MS) # Blue wipe
colorWipe(strip, Color(0, 0, 0), WAIT_MS) # Off wipe
## Rainbow animations.
#rainbow(strip)
#rainbowCycle(strip)
#colorWipe(strip, Color(0, 0, 0)) # Off wipe
while True:
try:
data = raw_input()
bits = data.split(',')
if len(bits) == 3:
if MODE == "shiftu":
shiftUp(strip, Color(int(bits[0]), int(bits[1]), int(bits[2])), WAIT_MS)
elif MODE == "shiftd":
shiftDown(strip, Color(int(bits[0]), int(bits[1]), int(bits[2])), WAIT_MS)
else:
colorWipe(strip, Color(int(bits[0]), int(bits[1]), int(bits[2])), WAIT_MS)
if (MODE[0] == 'p' and len(bits) == 4):
setPixel(strip, int(bits[0]), Color(int(bits[1]), int(bits[2]), int(bits[3]) ))
if (MODE[0] == 'p' and len(bits) == 5):
setPixels(strip, int(bits[0]), int(bits[1]), Color(int(bits[2]), int(bits[3]), int(bits[4]) ), WAIT_MS)
except (EOFError, SystemExit): # hopefully always caused by us sigint'ing the program
sys.exit(0)
except Exception as ex:
print "bad data: "+data
print ex