Secure backup on cloud with raspberry

Yesterday my usb drive connected to the raspberry is dead and I lost about 20 gigabytes of data. This morning I implemented a system of automatic backup cloud to prevent these problems.

I used box.com will have access to 50gb and the webdav protocol

Requirements:

1. sudo apt-get update && sudo apt-get install davfs2

Now we create a mount point to access the cloud

1. mkdir /media/box

Check if the connection to box. works

1. sudo mount -o uid=pi -o gid=pi -t davfs https://dav.box.com/dav /media/box

The system will ask user name and password box.com, if they are correct we could browse through our account in the folder /media /box

1. ls /media/box

If the test is ok, close all opened file and digit

1. sudo umount /media/box

ok perfect, so that we can mount the disk manually but every time we have to enter your username and password, we eliminate this "problem"

1. sudo nano /etc/davfs2/secrets

and add this line

1. https://dav.box.com/dav   yourusername   yourpassword

Now mount box.com without credentials, but a mount command is very long, we eliminate this "problem"

1. sudo nano /etc/fstab

and add this line

1. https://dav.box.com/dav /media/box davfs rw,noexec,noauto,user,async,_netdev,uid=pi,gid=pi 0 0

reboot system and you can simply mount the folder with

1. sudo mount /media/box

Now we use rsync to make a backup with the command

1. rsync -arHu --delete folderyouwantosave/ /media/box

The first backup will be slow (depending on your connection upload) and the next will be faster (incremental)

You can put the script in crontab every day/week even at night

Good backup

Timelapse video with raspberry and raspberry pi camera module

Today I did some tests with the raspberry camera module

First you need to decide how many photos you take and how often, in my test I've took a photos per minute for fours hours.
To do this, the command is very simple:

1. raspistill -o name_%04d.jpg -tl 60000 -t 14400000

-tl = timelapse mode, takes a picture every <t>ms (60.000 is 1x60x1000ms) = 1 minute
-t = time before taking picture (14.400.000 is 4x60x60x1000ms) = 4 hours
name_%04d = will result filenames with sequential number.

See man raspistill for more options

When taking photos is over we need to merge them into a video:

1. avconv -r 10 -i name_%04d.jpg -r 10 -vcodec libx264 -crf 20 -g 15 videoname.mp4

-r = is a fps
-crf = is a quality video, lowers value = best quality = large file size, I think that 20 is a good value

With this parameters the file size result is 140 Mb (original size 2592x1944). If you want to resize a video use this option during video creation:

1. avconv -r 10 -i name_%04d.jpg -r 10 -vcodec libx264 -crf 20 -g 15 -vf crop=2592:1944,scale=1280:720 videoname.mp4

With crop option the file size result is 15 Mb, perfect for youtube

How to display the status of the torrent from the terminal

Today I need to see the status of torrents from the terminal on the raspberry. After obtaining this information, you can implement a lot of things (turn on an LED when a torrent is finished, send an email, write something on the lcd monitor etc ...).
The solution is the following:

transmission-remote --auth=username:password -l

but if, as in my case the transmission is non-standard port or host is different just use the command

transmission-remote host:port --auth=username:password -l

After obtaining the status of the torrent you can do the "parsing" of the result to be able to implement in a script (send mail, php page, lcd, led etc ...)

For more information and options read the man transmission-remote

Page for monitor real-time values ​​that uses graphs gauge with Google api

Hello everyone, here I will explain how to have a php page on some raspberry to monitor real-time values ​​that uses graphs gauge with Google api:

Requirements: php and apache2 without any particular configuration

This will be the final result with a marker that moves in real time:

The project is based on two files: data.php and index.html

data.php: collects the values ​​returning a standard json string with "tags" (example: temp, memory, cpu …). The name of the tag is important because it is used to retrieve the values ​​of the graphics

code:

1. <?php
2. $data["mem_used"]=intval(exec('free -m | grep Mem | awk \'{print $3}\''));
3. $data["temperature"]=floatval(exec('/opt/vc/bin/vcgencmd measure_temp | cut -c6-9'));
4. $data["cpu"]=floatval(exec('vmstat | egrep -v \'cpu|us\' | awk \'{ print $13 }\''));
5. $json=json_encode($data);
6. echo $json;
7. ?>

launching “php data.php” from terminal

result:

{"mem_used":144,"temperature":56.2}

You can add almost all the commands of the terminal (remember that the commands will be launched with www-data user), if the result of json string is 0 for one parameter, check this command from the terminal with user www-data and check error or permission denied

example: If you add this code (vmstat | egrep -v \'cpu|us\' | awk \'{ print $13 }\') for check cpu percentage you must add www-data user to “video” and “plugdev” linux groups

index.html: if data.php is correct display a gauge graph :)

in the documentation on the internet I have not found a way to dynamically change the graphics so I created a function

code:

1. <!--
2. You are free to copy and use this sample in accordance with the terms of the
3. Apache license (http://www.apache.org/licenses/LICENSE-2.0.html)
4. -->
5. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
6. <html xmlns="http://www.w3.org/1999/xhtml">
7.   <head>
8.     <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
9.     <title>
10.       standard title page
11.     </title>
13. <!--
14. google api don’t change
15. -->
17.  <script type="text/javascript" src="http://www.google.com/jsapi"></script>
18.         <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
19.     <script type="text/javascript">
20.       google.load('visualization', '1', {packages: ['gauge']});
21.           google.setOnLoadCallback(drawVisualization);
22.           $(document).ready(function() {
23.                 chart = new google.visualization.Gauge(document.getElementById('visualization'));
24.                 chart2 = new google.visualization.Gauge(document.getElementById('visualization2'));
25.                 chart3 = new google.visualization.Gauge(document.getElementById('visualization3'));
27. // first graph (temperature proc)
29.         data = google.visualization.arrayToDataTable([
30.           ['Label', 'Value'],
31.           ['Temp', 0],
32.         ]);
33.                 options = {
34.           width: 250, height: 250,
35.           max:100, min:0,
36.                   animation:{duration: 500},
37.                   redFrom:70, redTo:100,
38.                   yellowFrom:50, yellowTo:70,
39.                   greenFrom:0, greenTo:50,
40.           minorTicks: 10,
41.           majorTicks: ["0",,20,,40,,60,,80,,100]
42.         };
45. // second graph (ram used)
47.         data2 = google.visualization.arrayToDataTable([
48.           ['Label', 'Value'],
49.           ['Memory', 0],
50.         ]);
51.                 options2 = {
52.           width: 250, height: 250,
53.           max:512, min:0,
54.                   animation:{duration: 500},
55.                   redFrom:400, redTo:512,
56.                   yellowFrom:300, yellowTo:400,
57.                   greenFrom:0, greenTo:300,
58.           minorTicks: 10,
59.           majorTicks: ["0",,128,,,256,,,384,,512]
60.         };
63. // third graph (cpu percentage used)
65.         data3 = google.visualization.arrayToDataTable([
66.           ['Label', 'Value'],
67.           ['Cpu', 0],
68.         ]);
69.                 options3 = {
70.           width: 250, height: 250,
71.           max:100, min:0,
72.                   animation:{duration: 500},
73.                   redFrom:60, redTo:100,
74.                   yellowFrom:30, yellowTo:60,
75.                   greenFrom:0, greenTo:60,
76.           minorTicks: 10,
77.           majorTicks: ["0",,20,,,50,,,80,,100]
78.         };
82.           });
83. // function to update data automatically
85.       function drawVisualization() {
86.                 chart.draw(data,options);
87.                 chart2.draw(data2,options2);
88.                 chart3.draw(data3,options3);
89.       }
91.           function test(ajaxdata) {
92.                         var memused=ajaxdata.mem_used;
93.                         var temperature=ajaxdata.temperature;
94.                         var cpu=ajaxdata.cpu;
95.                         console.log(ajaxdata);
96.                         data.setValue(0,1,temperature);
97.                         data2.setValue(0,1,memused);
98.                         data3.setValue(0,1,cpu);
99.                         chart.draw(data,options);
100.                         chart2.draw(data2,options2);
101.                         chart3.draw(data3,options3);
102.           }
104.           function status_update() {
105.                  var jqxhr = $.getJSON('data.php?' + 'random=' + Math.random(), function() {
106.                 })
107.                 .fail(function() {
108.                 })
109.                 .done(function(ajaxdata) {
110.                 test(ajaxdata);
111.                 });
112.           }
114.       var refreshId = setInterval('status_update()', 1000);
115.           $.ajaxSetup({ cache: false });
117.     </script>
118.   </head>
120. <!--
121. html standard for view a graph
122. -->
125. <body style="font-family: Arial;border: 0 none;">
126. <div id="visualization" style="float: left; width: 250px; height: 250px;"></div>
127. <div style="clear:both"></div>
128. <div id="visualization2" style="float: left; width: 250px; height: 250px;"></div>
129. <div id="visualization3" style="float: left; width: 250px; height: 250px;"></div>
132.   </body>
133. </html>

I hope I have been helpful, in the future will add the code to save the values in line chart for historical values (temperature e humidity sensor...) and button to take actions through gpio only via php page. Thx to my friend Luca Soltoggio (http://arduinoelectronics.wordpress.com) for the code support