Rpi_buitenlicht_v21.py

#Libraries/modules
import RPi.GPIO as GPIO
from time import sleep, localtime
import datetime
import ephem

#-----------------------------------------------------------#
#                      General parameters                   #
#-----------------------------------------------------------#

#display no warnings (on command line)
GPIO.setwarnings(False)
#use RPi board pin numbers
GPIO.setmode(GPIO.BOARD)
#set pin 18 and 22 as output
GPIO.setup(18, GPIO.OUT)
GPIO.setup(22, GPIO.OUT)

delay_s     = 60 #delay in seconds

#Get Latitude and Longitude from home
#(http://itouchmap.com/latlong.html)
home_lat  = '51.5'
home_long = '5.5'

welcome_mess = "From Dusk Till Dawn v2.1 (08/2014)"
print "\n"
print welcome_mess

while 1:

     #-----------------------------------------------------------#
     #                Determine sunrise/sunset                   #
     #-----------------------------------------------------------#

     #determine present date/time
     now_double = datetime.datetime.now()
     print "\n"
     print "Date/Time: ", now_double
     #print "hour: ", now_double.hour
     #print "minu: ", now_double.minute

     #determine previous/next sunset and -rise

     #determine position of observer
     o = ephem.Observer()
     o.lat  = home_lat
     o.long = home_long
     #define sun as object of interest
     s = ephem.Sun()
     sunrise = o.next_rising(s)
     sunset  = o.next_setting(s)

     sr_next = ephem.localtime(sunrise)
     ss_next = ephem.localtime(sunset)

     print "next sunset : ", ss_next
     print "next sunrise: ", sr_next

     #-----------------------------------------------------------#
     #                    Determine day/night                    #
     #-----------------------------------------------------------#

     if sr_next > ss_next:
       #day
       print "Turn off lights"
       status = 0
     else:
       #night
       print "Turn on lights"
       status = 1

     #Update GPIO with (new) status
     GPIO.output(18, status)
     GPIO.output(22, status)

     sleep(delay_s)   #wait