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RasPi Magazine

RasPi Magazine No. 25

From the team behind Linux User & Developer magazine, RasPi is the essential guide to getting the most out of the Raspberry Pi credit-card sized computer. Packed with expert tutorials on how to design, build and code with the Raspberry Pi, this digital magazine will educate and inspire a new generation of coders and makers. What you’ll find in every issue: • Get hands-on with your Raspberry Pi – we show you the best way to code, build and create with this awesome educational computer. • Awesome RasPi projects in each issue – get inspired to create something amazing with projects big and small. • Our easy to follow step-by-step tutorials and designed for all abilities and age groups. • Need to know more about anything Raspberry Pi? You can chat with the team and get your questions answered.

País:
United Kingdom
Língua:
English
Editora:
Future Publishing Ltd
Periodicidade:
Back issue only
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nesta edição

1 minutos
welcome

The Raspberry Pi is the perfect size for a lot of things, but one of the most fun things that you can do with it is have it control LEDs. Who wouldn’t want their own Pi-based disco? And that’s exactly what you’ll learn to create this issue, as we demonstrate how you can get the Pi to make a five-metre strip of LEDs react to music. Want to see a similar idea on an even grander scale? Check out ElectroSuper, in which Fred Sapey-Triomphe and Yann Guidon apply the same principle to an entire railway station. It turns out that despite its diminutive size, you can still think big with the Pi. Also, learn to use your Pi as a networked media player, control sensors and send text messages. Enjoy…

9 minutos
visualise music with leds

In this feature, we will write a Python script that takes audio as the input, either as a line-in stream from an audio card or as a WAVE file to play. This audio stream will then be filtered into three bands – bass, middle and treble – using the signal-processing library that comes with SciPy. The amplitude of each band is averaged and then mapped to a colour on an LED strip in real time, so that the LED strip changes colour as the energy of the music changes. The amazing results are sure to be the talk of your party. The script uses roughly 20% of one CPU core on a Raspberry Pi 2. As a result, it is highly likely that this tutorial will work just fine on any…

6 minutos
electrosuper

Fred Sapey- Triomphe is a visual artist who uses light as raw material. Trained at the École nationale supérieure des Beaux-Arts and the École Boulle, he lives and works in Paris Yann Guidon is an engineer who works with artists, specialising in electronics and algorithmics. He has designed two open source CPU architectures: F-CPU and YASEP The ElectroSuper installation at Mons station looks amazing! How long have you been collaborating? Fred Yann and I have been working together since February 2013. I wanted to create a large-scale LED display, and I’m a visual artist and have no foundation in electronics, so I couldn’t make it by myself. I met Yann through common friends and I went to his studio early in 2013. I was asked to do another project for a show in…

9 minutos
stream media through your network with osmc

THE PROJECT ESSENTIALS OSMChttps://osmc.tv Hard drive Home network Samba Another Linux computer, less than eight years old Thousands of images, videos and music files live in your pocket and it’s likely even more are in your personal cloud or hard drives. While it’s great enjoying these on our personal devices, it’s gratifying to see them on our big TV screens – but this isn’t easy. Do we hook up our laptops? Do we fiddle with a menagerie of wires and resolutions, hoping for a decent image? Will the sound work? All of this is taken care of with a Raspberry Pi 2 and OSMC. OSMC is an OS built to do one thing: put your media up on that big screen. But, how do we get media onto OSMC? Here we need Samba and a networked…

4 minutos
harness the power of the 1-wire bus

THE PROJECT ESSENTIALS Dallas Maxim temperature sensors Breadboard 4.7k resistor When interacting with sensors, one of three buses gets used. SPI is used for high-bandwidth applications, while the slower I2C excels at handling a large amount of slower sensors. Dallas Maxim’s proprietary 1-Wire bus has even slower data rates and a longer range than I2C, making it ideal for communicating with tiny devices like weather sensors and thermometers, and it is quite interesting because the 1-Wire bus requires only two wires to be run to the sensor – power is supplied via the data line. The bus has firmly established itself in two areas of application. First is iButtons, which contain memory and/or a cryptographic ID that can be used for access control – they have been used as keys for residential areas and school…

3 minutos
send an sms from your raspberry pi

THE PROJECT ESSENTIALS Raspberry Pi Twilio account Text messaging, or SMS (Short Message Service), has become a staple of everyday communication. What began life as a 40 pence message service is now offered by most tariff providers as an unlimited service. Twilio, a cloud communications company, enables you to send SMS messages for free from your Raspberry Pi to a mobile phone using just six lines of code. REST REST stands for Representational State Transfer. (It is sometimes spelt “ReST”.) It relies on a stateless, client- server, cacheable communications protocol – and in virtually all cases, the HTTP protocol is used. REST is an architecture style for designing networked applications. 01 Set up your Twilio account The first step of this project is to register for a Twilio account and Twilio number. This is free and will…