Raspberry Pi 2 Model B Quad Core28 Feb 2015
The Raspberry Pi Foundation has upped their entry in the single-board computer competition. Raspberry Pi 2 Model B boasts a quad core ARM CPU and 1GB of RAM. More important: Benchmarks show that the board is 6x faster than the previous model. And the performance bump has been achieved while the price remains low: Roughly $45.
Getting the board up and running is easier, too. You can buy a pre-built Linux image on micro SD. Or you can download the New Out Of the Box (NOOBS) image yourself. Depending on the speed of your internet connection, you can be up in running in less than an hour.
Easier Than Before
Special note about the NOOBS image: You don’t need a special utility to burn an SD card like before. The steps are:
- Download the NOOBS image and unzip it.
- Format a micro SD card that’s at lease 4GB in size.
- Drag the unzipped NOOBS files to the micro SD card.
- Insert the micro SD card into the Raspeberry Pi, apply power, and watch it boot.
Having done things the old way, I was surprised that the process was so simple this time. Hats off to the Raspberry Pi Foundation for a great installation experience.
After the device boots, you will need login credentials. These have not changed from the previous version:
raspberripi login: pi Password: raspberry
Note that the cursor will not move while you type the password.
Next, start the X Window environment.
And your desktop will look something like this.
Running Ruby, Rails
This incarnation of Raspberry Pi comes with Ruby 1.9.3 pre-installed. Of course, if you want to manage multiple versions of Ruby, RVM is a great way to go.
To install RVM, first run
gpg to verify that you will get an uncorrupted (or un-tampored with) version of RVM.
$ gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 $
Next, install RVM.
$ \curl -sSL https://get.rvm.io | bash -s stable $
And finally, let the current terminal session know that RVM is installed by typing the following at the command line.
$ source /home/pi/.rvm/scripts/rvm $
You can verify that RVM is installed by checking its version number like so…
$ rvm --version rvm 1.26.10 (master) by Wayne E. Seguin <firstname.lastname@example.org>, Michal Papis <email@example.com> [https://rvm.io/] $
Installing Ruby Versions
To install the latest stable version of Ruby…
$ rvm install ruby $
RVM will download dependencies as part of the installation process. From there, you can create RVM gemsets and
gem install rails or any other libraries you may need. More documentation can be found at http://rvm.io.