hyperion.ng/effects/knight-rider.py

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import hyperion
import time
import colorsys
# Get the rotation time
speed = float(hyperion.args.get('speed', 1.0))
fadeFactor = float(hyperion.args.get('fadeFactor', 0.7))
# Check parameters
speed = max(0.0001, speed)
fadeFactor = max(0.0, min(fadeFactor, 1.0))
# Initialize the led data
width = 25
imageData = bytearray(width * (0,0,0))
imageData[0] = 255
# Calculate the sleep time and rotation increment
increment = 1
sleepTime = 1.0 / (speed * width)
while sleepTime < 0.05:
increment *= 2
sleepTime *= 2
# Start the write data loop
position = 0
direction = 1
while not hyperion.abort():
hyperion.setImage(width, 1, imageData)
# Move data into next state
for i in range(increment):
position += direction
if position == -1:
position = 1
direction = 1
elif position == width:
position = width-2
direction = -1
# Fade the old data
for j in range(width):
imageData[3*j] = int(fadeFactor * imageData[3*j])
# Insert new data
imageData[3*position] = 255
# Sleep for a while
time.sleep(sleepTime)