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blinking-alpha.py
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blinking-alpha.py
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import time, random, sys
import RPi.GPIO as GPIO
operation = "blink"
speed = 1
ang0 = 7.6
ang90 = 4
ang180 = 2.7
initDC = ang0
needCycle = False
#check operation command first
argnum = len(sys.argv)
if argnum > 4 or argnum < 3:
print "usage : %s GPIO_PIN 'blink|half|close|open'" %(sys.argv[0])
sys.exit(-1)
GPIONum = int(sys.argv[1])
operation = sys.argv[2]
if operation == "blink" or operation == "helf":
if argnum == 4:
speed = int(sys.argv[3])
if speed > 3:
speed = 3
if operation == "close":
initDC = ang180
elif operation == "half":
initDC = ang90
elif operation == "open":
initDC = ang0
elif operation == "blink":
needCycle = True
GPIO.setmode(GPIO.BCM)
GPIO.setup(GPIONum, GPIO.OUT)
p = GPIO.PWM(GPIONum, 50) #frequency=50Hz
try:
p.start(initDC)
time.sleep(0.75)
if needCycle == True:
p.ChangeDutyCycle(ang180)
time.sleep( (float)(speed)/10 + 0.2 )
p.ChangeDutyCycle(ang0)
time.sleep(1)
p.stop()
GPIO.cleanup()
except KeyboardInterrupt:
p.stop()
GPIO.cleanup()