After the 2013 Berlin Marathon sold out in less than four hours, the organizers decided to alter the registration process for 2014. First there was a pre-registration phase followed by a random selection from the pool of registrants to receive a spot. Those who were selected had to register until November 11th, 2013. Any spots that were not confirmed till the 11th would be offered to pre-registered candidates according to the order in which they were randomly selected.
Two days ago the official hard-float Oracle Java 7 JDK has been announced on the official Raspberry Pi blog. Prior to this there was only the OpenJDK implementation which was lacking performance.
Furterhmore the Raspberry Pi Foundation announced that future Raspbian images would ship with. Oracle Java by default.
If you want to give it a spin you can install the JDK with:
$ sudo apt-get update && sudo apt-get install oracle-java7-jdk
If you work a lot on the command line you are probably familiar with the top utility to see what process is taking the most CPU or memory. There’s a similar utility called htop, which is an advanced, interactive system-monitor utility that can be used as a replacement tool for the default process monitoring command ‘top’ on a Linux ecosystem. This interactive process viewer provides a real-time, dynamic view of what’s happening on your Raspberry Pi system.
After I moved back from New Jersey in June 2008 I started to track my body weight more seriously. My routine usually consists of getting up and after finishing the morning bathroom I would step on my scale. That way I try to ensure that the condition for each weighing are as similar as possible. I recorded my weight on paper and eventually would put everything into a spreadsheet for further analysis.
One of the most important features in quantified self is the ability to export your data in an open format. Fitbit lets you download your personal data if you subscribe to a premium membership. Alternatively they provide an API at dev.fitbit.com/ that allows developers to interact with Fitbit data in their own applications, products and services.
In a blog post at quantifiedself.com Mark Levitt shows a way how to export your Fitbit data into Google Spreadsheets.
If you are overclocking your Raspberry Pi or you just curious how hot this little guy gets, there are two ways to get the internal temperature. Assuming you are running Raspbian as your operating system.
Method 1:
$ /opt/vc/bin/vcgencmd measure_temp This gives you the temperate in in degrees Celsius: temp=54.1'C
Method 2:
If you need the temperature to be more precise (e.g. storing it in an database or for further processing) use the following command:
If you log into your Raspberry Pi using ssh it will prompt you for a password. Having to do this multiple times a days this is very annoying. To ease the pain, and enhance security, you can use public key authentication instead. Therefor you create a pair of keys on your client, and store the public key on your Raspberry Pi. Then you set up an authentication by key. Afterwards the user can login into the Raspberry Pi using his private key.
In order to visually enhance my temperature logging I added some Javascript that computes sunrise and sunset for the 24h, 28h, weekly and monthly chart. Then I use this information to plot vertical bands on the chart indicating the effects of the sun on temperatures (and humidities):
To add the bands to your Highchart just get the sunrise and sunset value for a particular day and push it on the xAxis.
**tl;dr Checkout the charts on my RaspberryPi **
For quite a long time I was looking for a way to monitor and record th temperature and humidity at my apartment. What was missing was a convenient, preferably wireless solution. After receiving my RaspberryPi I started to look into that more intensively.
USB-WDE1 Receiver The USB Weather Data Receiver USB-WDE1 wirelessly receives data from various weather sensors of ELV at 868 MHz.
Once you have set up your Raspberry Pi chances are that you want to access it from remote machine or host a little web site on it. The problem is that your provider usually gives you a dynamic IP, which changes every time you connect to the Internet. In Germany most (A|V)DSL provider reset your connection every 24h. The solution for this is a dynamic DNS (DDNS), which automatically updates the name server in the Domain Name System (DNS).
