randomglow.py

## randomglow.py (by Cyrox @ngb.to)
## Last edited: 29/06/2014
## -----------------------------
## Lights up random LEDs of the PiGlow (http://shop.pimoroni.com/products/piglow)
## Needs "PyGlow" python module (https://github.com/benleb/PyGlow/blob/master/pyglow.py)
##
##
## Usage:
##
## RandomGlow.py [[<MinimumBrightness>] [<MaximumBrightness>] [<UpdateRate>] [<ResetLEDs>]]
##
## <MinimumBrightness> - Value between 0 and 255 (default: 1)
## <MaximumBrightness> - Value between 1 and 255, can't be less than <MinimumBrightness> (default: 150)
## <UpdateRate> - Defines how fast the LEDs are switched in seconds (default: 0.05)
## <ResetLEDs> - True or False, if true, the LED will go off after each turn (default: True)

from pyglow import PyGlow
from time import sleep
import random
import sys

### DEFAULT SETTINGS ###

rndMinBnDef = 1
rndMaxBnDef = 155
updateRateDef = 0.05
resetLEDsDef = True

########################

rndMinBn = rndMinBnDef
rndMaxBn = rndMaxBnDef
updateRate = updateRateDef
resetLEDs = resetLEDsDef

if len(sys.argv) >= 2 and 0 <= int(sys.argv[1]) <= 255:
        rndMinBn = int(sys.argv[1])

if len(sys.argv) >= 3 and 1 <= int(sys.argv[2]) <= 255:
        rndMaxBn = int(sys.argv[2])

if rndMinBn > rndMaxBn:
        rndMinBn = rndMinBnDef
        rndMaxBn = rndMaxBnDef

if len(sys.argv) >= 4:
        try:
                updateRate = float(sys.argv[3])
        except ValueError:
                pass

if len(sys.argv) >= 5:
        resetLEDs = (sys.argv[4].lower() != 'false')

print "All arguments:", str(sys.argv)
print "Minimum Brightness:", rndMinBn
print "Maxmimum Brightness:", rndMaxBn
print "Update rate (in secs):", updateRate
print "Reset LEDs:", resetLEDs
print "[PRESS CTRL+C TO EXIT]"

pyglow = PyGlow()

try:
        while True:
                rndLed = random.randint(1, 18)
                rndBn = random.randint(rndMinBn, rndMaxBn)
                pyglow.led(rndLed, rndBn)
                sleep(updateRate)
                if resetLEDs:
                         pyglow.all(0)

except KeyboardInterrupt:
        pyglow.all(0)