![[Photo gallery]](/staff/tp/icons/ico_gallery.png){kind=icon}
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''.
![[Zdjęcie T. Przechlewskiego]](/personal/rysunki/home-icon.jpg){kind=icon}
#!/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.
Yesterday I have got a letter containing BMP085 pressure sensor which I bought on ebay on November 20th 2012 (yes the post made a history with +50 days delivery from China).
To connect BMP085 to RPI first one has to install (in case both packages are not installed yet):
pi@raspberrystar ~ $ sudo apt-get install i2c-tools pi@raspberrystar ~ $ sudo apt-get install python-smbus
Now one has to enable i2c in raspbian. First one has to add the user pi to the group i2c:
pi@raspberrystar ~ $ sudo adduser pi i2c
Next one has to check the contents of
/etc/modprobe.d/raspi-blacklist.conf
and /etc/modules:
pi@raspberrystar ~ $ less /etc/modprobe.d/raspi-blacklist.conf # blacklist spi and i2c by default (many users don't need them) blacklist spi-bcm2708 blacklist i2c-bcm2708 pi@raspberrystar ~ $ less /etc/modules ... i2c-dev i2c-bcm2708
Some users advocate to remove i2c-bcm2708 from blacklisted modules but this seems unneccessary as:
pi@raspberrystar ~ $ lsmod | grep i2c i2c_bcm2708 3542 0 i2c_dev 5587 0
so I have i2c_bcm270 w/o modifying
/etc/modprobe.d/raspi-blacklist.conf
Reboot now to activate the new settings
The board my sensor came on has eight pins. There are boards
with 6 pins as well which seems to be more popular.
Only four out of 8 pins are used and the connections
are as follows (see pictures):
GND goes to Ground on the Pi (P1-05)
3.3 goes to 3V3 on the Pi (P1-01)
SDA goes to SDA on the Pi (P1-02)
SCL goes to SCL on the Pi (P1-03)
In Reading data from a Bosch BMP085 with a Raspberry Pi 6-ping sensor is used and the pins connections are different. I have tried but it does not work for my sensor.
I connect sensor to RPI using wires with female jumpers on both ends.
To check if the sensor (or other i2c device) is connected correctly,
one can run i2cdetect:
pi@raspberrystar ~ $ i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- 77
77 in the last row indicates that sensor is connected properly (otherwise the output will consists of rows of '--' only).
To get data from the sensor one has to install Adafruit-Raspberry-Pi-Python-Code or compile small C program available here:
## Download john.geek's C application: wget http://www.john.geek.nz/wp-content/uploads/2012/08/testBMP085.c wget http://www.john.geek.nz/wp-content/uploads/2012/12/smbus.c wget http://www.john.geek.nz/wp-content/uploads/2012/12/smbus.h ## Compile & run it gcc -Wall -o testBMP085 ./smbus.c ./testBMP085.c ./testBMP085 ## Download >Adafruit's one: git clone https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code.git cd Adafruit-Raspberry-Pi-Python-Code cd Adafruit_BMP085 ## Run python Adafruit_BMP085_example.py
Note: testBMP085 works with sensor connected to RPi as described in this post
(not as described by
john geek).
BTW: the pressure is identical as reported by my WH 2080 weather station. Perhaphs WH 2080 use exactly the same sensor!
Widok z mojego okna
Dziś uruchomiłem starą kamerę Logitech Webcam C200 na Raspberry Pi (bez
żadnych problemów--wystarczy wsadzić kabel USB). Chcę cyklicznie
robić zdjęcia tego co widzę z mojego okna i publikować je na wunderground.com.
Spróbowałem zastosować do tego celu program fswebcam.
BTW dobry opis kilku popularnych programów służących do obsługi kamer video jest tutaj.
Aby zainstalować fswebcam należy wykonać:
# apt-get install fswebcam
Uruchamiam fswebcam za pomocą następującego skryptu
(cf. Raspberry Pi --
Webcam streaming):
#!/bin/bash
OUTPUT_DIR=/var/www/cam/fswebcam-output
fswebcam -r 640x480 -S 11 --jpeg 95 \
--title "Sopot/Abrahama Street (PL)" \
--subtitle "View from my window" \
--info "Hardware: Logitech_Webcam_C200@raspberryPi" \
--save $OUTPUT_DIR/image.jpg -q
Aby publikować obrazki na wunderground.com należy
kamerę zarejestrować do czego służy prosty formularz. Obrazki mogą być
wysyłane na konto ftp na wunderground.com albo pobierane
z udostępnionego publicznego konta (w tym drugim przypadku należy
podczas rejestracji podać adres URL tegoż konta).
Ja wybrałem ftp
i rejestracja zakończyła się podaniem nazwy serwera ftp + nazwy
użytkownika. Hasło jest takie samo jak to używane do logowania się na
konto WWW na wunderground.com.
Do ładowania obrazków używam skryptu (cf. tutaj):
REMOTE='webcam.wunderground.com' USER='hrpunioCAM1' PASSWORD='#####' FTPLOG='/tmp/ftplog' date >> $FTPLOG ftp -n $REMOTE <<_FTP>>$FTPLOG quote USER $USER quote PASS $PASSWORD bin lcd /var/www/cam/fswebcam-output put image.jpg quit _FTP
Obrazki są generowane i wysyłane co kilka minut dzięki stosownemu
wpisowi w pliku crontab.
Link do obrazków z mojej kamery wunderground.com
jest tutaj.
View from my Window
Today I connected old Logitech Webcam C200 to my Raspberry Pi.
I just wanted to capture single
frames (at a specified time interval, say every 10 minutes) and upload
resulting images to wunderground.com.
I tried to use fswebcam for that purpose.
BTW a good description of available software for WebCams can be found here.
To install fswebcam one have to execute:
# apt-get install fswebcam
I run fswebcam with the following bash
script (borrowed from
Raspberry Pi --
Webcam streaming):
#!/bin/bash
OUTPUT_DIR=/var/www/cam/fswebcam-output
fswebcam -r 640x480 -S 11 --jpeg 95 \
--title "Sopot/Abrahama Street (PL)" \
--subtitle "View from my window" \
--info "Hardware: Logitech_Webcam_C200@raspberryPi" \
--save $OUTPUT_DIR/image.jpg -q
To display one's images at wunderground.com one have to
register the camera with a simple form.
The images can be uploaded to ftp account at
wunderground.com or they can be retrieved from the
public URL. As I have decided to upload them I have got ftp
account credentials upon sucessfull registration
(server and user name). The password is the same as for my
wunderground.com WWW account.
I upload images withe following bash script borrowed from here:
REMOTE='webcam.wunderground.com' USER='hrpunioCAM1' PASSWORD='#####' FTPLOG='/tmp/ftplog' date >> $FTPLOG ftp -n $REMOTE <<_FTP>>$FTPLOG quote USER $USER quote PASS $PASSWORD bin lcd /var/www/cam/fswebcam-output put image.jpg quit _FTP
Images are produced and uploaded every few minutes---the scripts are executed with appropriate crontab entries.
A link to my webcam at wunderground.com
is here.