Raspberry Pi

The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. The product website calls it “a capable little PC which can be used for many of the things that your desktop PC does, like spreadsheets, word-processing and games.” It also plays high-definition video. Model A (US$ 25) has been redesigned to have 256MB RAM, one USB port and no Ethernet. Model B (US$ 35) has 256MB RAM, two USB ports and an Ethernet port.

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Pass the Hat

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A touch display, a case, and a custom add-on board transform the humble Rasp Pi into a high-performance function generator that rivals expensive commercial offerings.


Out of This World

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Some of your favorite programs might not run on Raspberry Pi because no version is available for the ARM architecture. ExaGear Desktop changes that by acting as a translator between the ARM and x86 worlds.


Close to Your Heart

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A pulsemeter built with a Raspberry Pi, a digital-to-analog converter, and an optical sensor monitors your heart rate just as well as many far more expensive medical devices.


Sail Away

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With Node-RED, you can create a web dashboard that instructs a Raspberry Pi to set the rudder position on a toy sailboat.

If you are interested in Raspberry Pi:


Extend Your Feelers

Beekeepers can get to know their colonies better without continuously disturbing the industrious insects. Using a Raspberry Pi and various sensors, two hobby beekeepers monitor the temperature and humidity of their hives, with plans to monitor their weight.


MakerSpace – Powerhouse

The new Raspberry Pi 3 B+ stands out from its predecessor in many respects. Our tests show what the new model can do.


3, 2, 1 … Go!

Build a countdown counter with a Raspberry Pi and some electronics, and you can count down the time to any event.


Gamer’s Paradise

With the right software, you can turn the Raspberry Pi into a versatile console for retro games.


Fox Hunt

As a countermeasure to predators of rare ground-breeding birds, live traps are monitored by a microcontroller and a Raspberry Pi.


Pi FM Radio

Low-cost RTL-SDR dongles can read frequencies between 24 and 1,766MHz. We built a simple FM radio with a Raspberry Pi, a USB dongle based on the RTL2832U chipset, an LCD HAT, and some Python code.


Little Service

The versatile Raspberry Pi can serve many roles on a home network. We'll show you how to set up the Pi to provide some important network services.


Gateway to the World

Extend protection to all of your Internet traffic with a Raspberry Pi minicomputer set up as a cost-effective external proxy server.


Tiny Backup Box

With some creativity and a little scripting, you can easily turn your Raspberry Pi into an effective backup device.


Weather Watch

My new weather station has several sensors for wind, rain, and temperature, as well as a USB cable and evaluation software (Figure 1), albeit a desktop-only Windows application. However, I wanted to record the measured data and, if possible, access it on my cell phone while I was on the move.

Positioning a Windows PC running 24/ 7 next to my weather station was not an option; instead, I set my sights on the Raspberry Pi. Thus far, I had used it as a tiny media center with an equally tiny speaker, but by using its USB connection, my Pi could read the data output from the weather station. The power requirement is negligible compared with that of a full-size PC, and the Pi is silent. The question then arose: How can I acquire the data via USB if the station only comes with a Windows program?

Pi Configuration

Your Raspberry Pi can be freshly installed with the official recommended Debian Raspbian “wheezy” image from the Download page on the Raspberry Pi website. The tool set necessary to complete this project comprises a C program, Ruby, the Sinatra web application library, a database, and graphing software, all of which are introduced in the “Ingredient” sections of this article. Figure 2 shows how all the components interact and fit together.

Issue 38: 101 Cool Linux Hacks/Special Editions

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