Tutorials

Changing the hostname of your #RaspberryPi

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For those people who (like me) have more than one Pi, and even for those who have more than one SD card, the ability to change the hostname is invaluable. Here’s how you do it.

You need to change two files.

Firstly, edit (using nano, or other editor) the file
/etc/hostname

Change whatever is currently in there to the name you want. For this example, we’ll set our Pi to have the name ‘banana’. So, ‘banana’ (without the quotes) is the only thing that should be in that file. Save it.

Secondly, edit the file
/etc/hosts

Change the ‘127.0.0.1’ line to (for our example):

127.0.0.1     banana

That’s it! Reboot and you should get a login prompt with your new hostname.

Accessories, Internet of things

RFM12Pi #RaspberryPi Expansion board kit (433 Mhz)

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With the addition of a 433Mhz RFM12Pi expansion board to receive data via wireless from other OpenEnergyMonitor modules (e.g emonTx) a Raspberry Pi running emoncms can be used as a powerful emonBase base-station to log, process and visualise energy, temperature and other environmental data. Data can be logged locally to the Raspberry Pi’s SD card and/or to a remote emoncms server. Emoncms graphs and dashboards are be served from the Raspberry Pi’s local web-server.

RFM12Pi Raspberry Pi Expansion board kit (433 Mhz) – Shop | OpenEnergyMonitor.

Internet of things, Tutorials

Using a #RaspberryPi as a Ninja Block @Raspberry_Pi

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Using a Raspberry PI as a Ninja Block | Ninja Blocks

“Ninja Blocks are tiny cloud enabled computers that can sense their environment by receiving input from a variety of sensors & can affect their surroundings by controlling lights, power sockets, and other actuators.”

The company making the Ninja Blocks have written an article about using a Raspberry PI as a Ninja Block. I’ve not tried it out for myself, but it seems like an intriguing way of having the Raspberry Pi as an Internet Of Things device. They’ve also got a post on adding a temperature sensor to the RPi via an Arduino and they’ve also got a dedicated Forum for Raspberry Pi owners who implement the idea.

My Projects, Tutorials

Volunteer your #RaspberryPi to analyse SETI data / @Raspberry_Pi

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Daniel Carrion at Burde View has been getting “BOINC” up and running in order to use his Raspberry Pi to analyse telescope and other astronomical data.

“BOINC is open-source software for volunteer computing and grid computing. It uses to the idle time on your computer to help cure diseases, study global warming, discover pulsars and do other scientific research.”

BURDE VIEW: Raspberry Pi BOINC Project

SETI@home is a scientific experiment that uses Internet-connected computers in the Search for Extraterrestrial Intelligence (SETI). You can participate by running a free program that downloads and analyzes radio telescope data.

Carrion also lists other projects that work with BOINC including MilkyWay@Home and Einstein@Home.

Get your Pi changing the world now by following the instructions at BURDE VIEW.

I currently have my Pi helping with the Milky Way project and I hope to get it working with SETI as well!