{"id":1585,"date":"2016-02-04T15:30:11","date_gmt":"2016-02-04T13:30:11","guid":{"rendered":"https:\/\/blog.zitnik.si\/?p=1585"},"modified":"2016-02-04T15:30:11","modified_gmt":"2016-02-04T13:30:11","slug":"part-23-openhab-rpi-leds-camera","status":"publish","type":"post","link":"https:\/\/blog.zitnik.si\/?p=1585","title":{"rendered":"Part 2\/3: OpenHAB + RPi + LEDs + Camera"},"content":{"rendered":"

We are continuing with the example from the first part of the tutorial: https:\/\/blog.zitnik.si\/2016\/02\/04\/part-13-controlling-leds-using-raspberry-pi\/<\/a>.<\/p>\n

In this part we are going to install OpenHAB platform on an RPi and remotely control LEDs.<\/p>\n

OpenHAB (http:\/\/www.openhab.org\/<\/a>) \u00a0is a software that is intended to connect to many sensors or devices for home automation. It works as a smart devices gateway and includes tools to design a custom GUI to control these connected smart devices. A GUI can be accessed using a web browser or from a nice mobile application (iOS, Android).<\/p>\n

OpenHab Installation<\/strong><\/p>\n

We first installed OpenHAB core and then Demo from the official site: http:\/\/www.openhab.org\/getting-started\/downloads.html<\/a>. These are compressed packages which I unzip into \/opt\/openhab folder.\u00a0Within the new directory, there\u2019ll be a folder called configurations. Within this folder create a copy of the default configuration file openhab_default.cfg and name it openhab.cfg. This is where you\u2019ll store all your settings for openHAB and any bindings you need.<\/p>\n

To start the OpenHAB server, run \/opt\/openhab\/start.sh.<\/p>\n

OpenHAB configuration<\/em><\/p>\n

To control our LEDs we will need to create three files.<\/p>\n

Create a file configurations\/items\/default.items. This will be an inventory for definition of our sensors. The file should look like:<\/p>\n

[codesyntax lang=”text”]<\/p>\n

Switch RedLight\t\t\t\t\"Rdeca luc\"\r\nSwitch GreenLight\t\t\t\"Zelena luc\"\r\nSwitch YellowLight\t\t\t\"Rumena luc\"<\/pre>\n
[\/codesyntax]<\/p>\n
The next file should define the rules and actions for these sensors. So, create a file named configurations\/rules\/default.rules to look like:<\/p>\n
[codesyntax lang=”text”]<\/p>\n
import org.openhab.core.library.types.*\r\nimport org.openhab.core.persistence.*\r\nimport org.openhab.model.script.actions.*\r\nimport org.openhab.action.pushover.*\r\nimport org.openhab.action.pushover.internal.*\r\n\r\nrule \"RedLight changed\"\r\nwhen\r\n Item RedLight received command ON\r\nthen\r\n logInfo(\"RedLight\", \"Received red light command to turn on.\")\r\n executeCommandLine(\"python \/home\/pi\/red_on.py\")\r\n pushover(\"Rdeca luc je bila prizgana.\")\r\nend\r\n\r\nrule \"RedLight changed\"\r\nwhen\r\n Item RedLight received command OFF\r\nthen\r\n logInfo(\"RedLight\", \"Received red light command to turn on.\")\r\n executeCommandLine(\"python \/home\/pi\/red_off.py\")\r\nend<\/pre>\n
[\/codesyntax]<\/p>\n
As you can see I also configured the pushover service so that I am notified about the change via a push notification. It can also be observed that on some command received, a log message is created and a command line script is executed. These scripts look the same as in the first part of the tutorial, where we introduced how to turn LED on or off.<\/p>\n
In the last file, named configuration\/sitemaps\/default.sitemap we will define the GUI for our application. Our file looks like this:<\/p>\n
[codesyntax lang=”text”]<\/p>\n
sitemap demo label=\"Raspberry demo\"\r\n{\r\n Frame label=\"Luci\" {\r\n   Switch item=GreenLight label=\"Zelena luc\"\r\n   Switch item=YellowLight label=\"Rumena luc\"\r\n   Switch item=RedLight label=\"Rdeca luc\"\r\n }\r\n Frame label=\"Videokamere\" {\r\n   Text label=\"Raspberry kamera\" icon=\"video\" {\r\n     Frame label=\"Raspberry kamera\" {\r\n       Video url=\"http:\/\/localhost:8081?action=stream\" encoding=\"mjpeg\"\r\n     }\r\n   }\r\n   Text label=\"Raspberry kamera\" icon=\"garden\" {\r\n     Frame label=\"Raspberry kamera (snapshot)\" {\r\n       Image url=\"http:\/\/localhost:8081?action=snapshot\" refresh=5000\r\n     }\r\n   }\r\n }\r\n}<\/pre>\n
[\/codesyntax]<\/p>\n
For now you can skip the “Videokamere” part as it defines video stream and snapshot images of a camera that we will attach to the raspberry (below).<\/p>\n
As you save the file and run the server, the GUI can be accessed via a web browser using URL http:\/\/RPi_IP:8080:<\/p>\n
\"Screen<\/a><\/p>\n
You can also use this URL in a mobile application and have a native interface – e.g. on your iPhone, which looks like this (for our sitemap definition):<\/p>\n
\"IMG_0162\"<\/a><\/p>\n
You should now be able to turn on or off your LEDs using OpenHAB platform. Try it out!<\/p>\n
OpenHAB and Raspberry Pi Camera Module<\/strong><\/p>\n
Now we would also like to check our lights remotely via a camera. We will use mjpeg stream for video streaming.<\/p>\n
We have an RPi Camera Module, which we attached to the RPi. After that we run “sudo raspi-config” command and enable the camera module.<\/p>\n
First we need to install some dependencies:<\/p>\n
[codesyntax lang=”bash”]<\/p>\n
sudo apt-get install libjpeg8-dev\r\nsudo apt-get install imagemagick\r\nsudo apt-get install libjpeg62-dev\r\nsudo apt-get install cmake<\/code><\/pre>\n
sudo apt-get install libv4l-dev\r\n#create a symbolic link\r\nsudo ln -s \/usr\/include\/libv4l1-videodev.h \/usr\/include\/linux\/videodev.h<\/code><\/pre>\n
[\/codesyntax]<\/p>\n
Then we download mjpeg repository and build the library:<\/p>\n
[codesyntax lang=”bash”]<\/p>\n
<\/pre>\n
# You can also choose to download some stable version instead of current master<\/span>\r\ngit clone https:\/\/github.com\/jacksonliam\/mjpg-streamer.git .\r\nsudo make clean all\r\n<\/code><\/pre>\n
[\/codesyntax]<\/p>\n
Now copy the directory of build files to \/opt\/mjpg-streamer and\u00a0run mjpeg streamer using the following command (I am using parameter vf<\/em> to vertically flip the image):<\/p>\n
[codesyntax lang=”bash”]<\/p>\n
LD_LIBRARY_PATH=\/opt\/mjpg-streamer \/opt\/mjpg-streamer\/mjpg_streamer -i \"input_raspicam.so -fps 5 -q 50 -x 640 -y 480 -vf\" -o \"output_http.so -w \/opt\/mjpg-streamer\/www -p 8081\" &<\/pre>\n
[\/codesyntax]<\/p>\n
If everything is okay, a video stream should be accessible at http:\/\/RPi_IP:8081:<\/p>\n
\"Screen<\/a><\/p>\n
Also if OpenHAB is configured as above, videostream should be accesible over its GUI:<\/p>\n
\"Screen<\/a><\/p>\n
<\/div>","protected":false},"excerpt":{"rendered":"
We are continuing with the example from the first part of the tutorial: https:\/\/blog.zitnik.si\/2016\/02\/04\/part-13-controlling-leds-using-raspberry-pi\/. In this part we are going to install OpenHAB platform on an RPi and remotely control LEDs. OpenHAB (http:\/\/www.openhab.org\/) \u00a0is a software that is intended to connect to many sensors or devices for home automation. It…<\/p>\n
Continue readingPart 2\/3: OpenHAB + RPi + LEDs + Camera<\/span><\/a><\/div>\n","protected":false},"author":1,"featured_media":1592,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,30],"tags":[],"class_list":["post-1585","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-computer-engineering","category-free-time","entry"],"_links":{"self":[{"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=\/wp\/v2\/posts\/1585","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1585"}],"version-history":[{"count":3,"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=\/wp\/v2\/posts\/1585\/revisions"}],"predecessor-version":[{"id":1593,"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=\/wp\/v2\/posts\/1585\/revisions\/1593"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=\/wp\/v2\/media\/1592"}],"wp:attachment":[{"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1585"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1585"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.zitnik.si\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}