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Medium 9781449355784

3. Digital Output

Elliot Williams Maker Media, Inc ePub

POV Toy

If you got the project from Chapter 2 running, you’ve gotten yourself a little bit familiar with the AVR toolchain. You’ve hooked up a simple circuit on the breadboard, and you’ve seen the first sweet blinkies of success! Now you’re ready to take the next step: even more blinkies blinking even faster, and looking at what’s going on under the hood.

The project for this chapter is a persistence-of-vision (POV) pattern generator. By turning eight LEDs on and off really quickly, the POV toy exploits your eye’s slow response to light in order to draw patterns that seem to float in midair when you scan your eyes across the LEDs. For an example of how this looks, see Figure 3-1. POV toys are fun, and you’ll have something neat to show for your efforts at the end of the chapter. You could spend an entire rainy Saturday making up neat patterns to display on the POV toy. (Don’t ask me how I know!)

In this chapter, in addition to the programming setup from Chapter 2, you will need:

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Medium 9781742204185

Greece

Lonely Planet Lonely Planet ePub

     Includes »

     Athens

     The Peloponnese

     Thessaloniki

     Saronic Gulf Islands

     Mykonos

     Paros

     Naxos

     Ios

     Santorini (Thira)

     Crete

     Dodecanese

     Rhodes

     Sporades

     Ionian Islands

     Corfu

»Marco Polo Café (Click here)

»Alaloum (Click here)

»Café Avyssinia (Click here)

»Spondi (Click here

»Taverna Lava (Click here)

»1700 (Click here)

»Amfitriti Pension (Click here)

»Francesco’s (Click here)

»Pension Sofi (Click here

»Hotel Afendoulis (Click here)

Don’t let headline-grabbing financial woes put you off going to Greece. The alluring combination of history and hedonism, which has made Greece one of the most popular destinations on the planet, continues to beckon, and now is as good a time as ever to turn up for some fun in the sun. Within easy reach of magnificent archaeological sites are breathtaking beaches and relaxed tavernas serving everything from ouzo to octopus. Wanderers can island-hop to their heart’s content, while party types can enjoy pulsating nightlife in Greece’s vibrant modern cities and on islands such as Mykonos, Ios and Santorini. Add welcoming locals with an enticing culture to the mix and it’s easy to see why most visitors head home vowing to come back. Travellers to Greece inevitably end up with a favourite site they long to return to – get out there and find yours.

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Medium 9781741792812

Copenhagen

Lonely Planet Lonely Planet ePub

     Includes »

     Copenhagen

     Around Copenhagen

     Louisiana

     Arken Museum of Modern Art

     Charlottenlund

     Klampenborg

     Lyngby

Copenhagen is the coolest kid on the Nordic block. Edgier than Stockholm and worldlier than Oslo, the Danish capital gives Scandinavia the X factor. Just ask style bibles Monocle and Wallpaper magazines, which fawn over its industrial-chic bar, design and fashion scenes, and culinary revolution. This is where you’ll find New Nordic pioneer Noma, voted the world’s best restaurant in 2010 and 2011, and one of 10 Michelin-starred restaurants in town – not bad for a city of 1.2 million.

Yet Copenhagen is more than just seasonal cocktails and geometric threads. A royal capital with almost nine centuries under its svelte belt, it’s equally well versed when it comes to world-class museums and storybook streetscapes. Its cobbled, bike-loving streets are a hyggelig (cosy) concoction of sherbet-hued town houses, craft studios and candlelit cafes. Add to this its compact size, and you have what is possibly Europe’s most seamless urban experience.

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Medium 9781491947203

20. Moving Your Site to the Internet

David Sawyer McFarland O'Reilly Media ePub

Building web pages is a big accomplishment, but it’s not the whole job. Your beautifully designed and informative site will languish in obscurity unless you move it from your hard drive to a web server.

Fortunately, once your site is ready for prime time, you can put it on a server without ever leaving the comfort of Dreamweaver. The program includes simple commands for transferring files back and forth between the server and your desktop. All you need to do is provide Dreamweaver with the information it needs to connect to your server.

Dreamweaver CC 2014 includes many enhancements to make transferring files fast and efficient. Since Dreamweaver CS6, it has allowed multiple, simultaneous connections to a server. In other words, the old Dreamweaver transferred files one at a time, but the recent versions can send multiple files at once.

As you work on your website—whether you build the site from scratch or modify existing pages—you keep your files in a local root folder (see Up to Speed: Terms Worth Knowing), often called a local site for short. You can think of a local site as a work in progress; you’ll routinely have partially finished documents sitting on your computer.

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Medium 9780596006709

Securing BIND

Michael D. Bauer O'Reilly Media PDF

Performance

D. J. Bernstein claims that djbdns has much better speed and reliability, and a much smaller RAM footprint, than BIND. Several acquaintances of mine who administer extremely busy DNS servers rely on djbdns for this reason.

So, djbdns is superior to BIND in every way, and the vast majority of DNS administrators who use BIND are dupes, right? Maybe, but I doubt it. djbdns has compelling advantages, particularly its performance. If you need a caching-only nameserver but not an actual DNS authority for your domain, djbdns is clearly a leaner solution than BIND. But the IETF is moving DNS in two key directions that Mr. Bernstein apparently thinks are misguided, and therefore that he refuses to support in djbdns.

The first is DNSSEC. For secure zone transfers, djbdns must be used with rsync and

OpenSSH, since djbdns does not support TSIGs or any other DNSSEC mechanism.

The second is IPv6, which djbdns does not support in the manner recommended by the IETF (which is not to say that Mr. Bernstein is completely against IPv6; he objects to the way the IETF recommends it be used by DNS).

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