# up.py python3 program to raise blinds
import time
import RPi.GPIO as GPIO
import sys
import shutil
from os.path import exists
channel1 = 17 # motor left
channel2 = 27 # motor right
channel3 = 22 # power switch
traveltime = 86
upfile = '/home/pi/shade/up.status' # existance of this files means blinds are currently up
downfile = '/home/pi/shade/down.status' # existance of this files means blinds are currently down
raisefile = '/home/pi/shade/raise.status' # existance of this files means blinds were partly raised
lowerfile = '/home/pi/shade/lower.status' # existance of this files means blinds were partly lowered
stopfile = '/home/pi/shade/stop.status' # existance of this files means disable movement of blinds (windy)
stopfile_exists = exists(stopfile)
upfile_exists = exists(upfile)
downfile_exists = exists(downfile)
# if on vacation or windy a stopfile prevents program running
if ( stopfile_exists):
sys.exit('Warning cannot raise blind because of stopfile at: /home/pi/shade/stop.status')
if (not downfile_exists):
sys.exit('Error cannot raise blind that is up: /home/pi/shade/down.status')
shutil.move(downfile, raisefile)
sys.stdout.write ('raise ')
#GPIO setup
GPIO.setmode(GPIO.BCM)
GPIO.setup(channel1, GPIO.OUT)
GPIO.setup(channel2, GPIO.OUT)
GPIO.setup(channel3, GPIO.OUT)
def motor_off(pin):
GPIO.output(pin, GPIO.HIGH) # Turn on
print ("off")
def motor_on(pin):
GPIO.output(pin, GPIO.LOW) # Turn off
print ("on")
def waitfor(seconds):
if (seconds >= 1):
for x in range(seconds):
if (x % 10 == 0):
sys.stdout.write (':')
else:
sys.stdout.write ('.')
sys.stdout.flush()
time.sleep (1)
else:
time.sleep (seconds)
# set relays ready to raise
motor_off(channel1)
motor_off(channel2)
# wait saftey time of 1/10 second for relays
waitfor (.1)
# turn on power switch
motor_on(channel3)
waitfor (traveltime)
# turn off power switch
motor_off(channel3)
waitfor (.1)
GPIO.cleanup()
shutil.move(raisefile, upfile)
