The script: 1) suspend capturing images at night for obvious reason
and 2) writes images to files named as:
image_<odd-or-even-week><day-of-week>_<hour><minute>.jpg
Thus only images from the last two weeks are stored and the older ones are deleted ``automatically''.
#!/bin/bash OUTPUT_DIR=/var/www/cam/fswebcam-output # Max resolution for C270 webcam is 1280x720 RESOLUTION="1280x720" QUALITY="85" MINUTE=`date +%M` HOUR=`date +%H` MONTH=`date +%m` DAY_OF_WEEK=`date +%u` WEEK=`date +%U` FILE_OUT=`date +%d%H%M` TODAY=`date +%Y/%m/%d` ## Suspend capturing pictures at night DAY_START=`sun_calc.py -date "$TODAY" -city Sopot -param dawn` DAY_STOP=`sun_calc.py -date "$TODAY" -city Sopot -param dusk` if [ "$DAY_START" = "False" -o "$DAY_STOP" = "True" ] ; then NIGHT="YES"; exit; fi fswebcam -r $RESOLUTION -S 11 --jpeg $QUALITY \ --title "Sopot/Abrahama Street (PL)" \ --subtitle "View from my window" \ --info "Logitech_Webcam_C270@raspberryPi ($RESOLUTION)" \ --save $OUTPUT_DIR/image.jpg -q ## Rotate photos every two weeks ## Week number modulo 2 (0 or 1) WEEK_NO=$(($WEEK % 2)) FILE_OUT="${WEEK_NO}${DAY_OF_WEEK}_$HOUR$MINUTE" ## Wundergound expects the file is `image.jpg'. ## To preserve from overwriting rename: cd $OUTPUT_DIR && cp image.jpg image_$FILE_OUT.jpg
./sun_calc.py
is a Python script (I am not
Python programmer BTW):
#!/usr/bin/python import datetime import argparse import pytz from astral import Astral city_name = 'Sopot' parser = argparse.ArgumentParser() parser.add_argument("-date", type=str, help="Date as yyyy/mm/dd") parser.add_argument("-city", type=str, help="City name") parser.add_argument("-param", type=str, help="dusk sunrise sunset or dawn") parser.add_argument("-verbose", help="Icrease verbosity", action="store_true") args = parser.parse_args() dat = args.date city_name = args.city param = args.param verb_level = args.verbose [year, month, day] = dat.split("/"); year = int(year) month = int(month) day = int(day) a = Astral() city = a[city_name] a.solar_depression = 6 ## sd can be: 6, 12, 18 timezone = city.timezone sun = city.sun(date=datetime.date(year, month, day), local=False) sun_local = city.sun(date=datetime.date(year, month, day), local=True) time_now = datetime.datetime.utcnow().replace(tzinfo = pytz.utc) if verb_level > 0: print('solar_depressions: ' + str(a.solar_depression)) print city_name + " " + str(time_now) + " " + str(sun[param]) \ + " (" + str(sun_local[param]) + ")" print time_now > sun[param]
The script based on astral
package can compute
dusk/dawn time (among other things) and compares it to the current time.
If current time is past dusk/dawn (specified as a command line parameter)
./sun_calc.py
returns True
.
Otherwise it returns False
.
The astral
package does not contains Sopot but it is easy
to add it just
by editing astral.py
(before installation of course):
Sopot,Poland,54°44'N,18°55'E,Europe/Warsaw
A short test demonstrating that for Sopot and Warsow the script returns significantly different results:
./sun_calc.py -date 2013/01/21 -city Sopot -param dawn -verbose solar_depressions: 6.0 Sopot 2013-01-21 09:17:11.368979+00:00 2013-01-21 06:09:47+00:00 (2013-01-21 07:09:47+01:00) ./sun_calc.py -date 2013/01/21 -city Warsaw -param dawn -verbose solar_depressions: 6.0 Warsaw 2013-01-21 09:17:46.172157+00:00 2013-01-21 05:53:22+00:00 (2013-01-21 06:53:22+01:00) True
So there is circa 15 minutes difference between Sopot which is some 300 km to the North from Warsaw.