Group items tagged

So NFC is just a method of communication between two devices at short distance. What makes the NFC antenna design simple or easy? If you know much about antennas, the first question you might ask is what is the operating frequency of NFC. It turns out that these devices operate around 13.56 MHz. The corresponding wavelength is 22 meters long - this means to get a nice half-wave dipole antenna (that radiates well) we would need a device about 11 meters in length.

he NFC antenna area may be limited to 3"x1" (or 7 cm * 2.5 cm). Hence, we are talking about fitting an antenna i

to a volume where the maximum linear dimension is about 0.5% or less of a wavelength. And from antenna theo

ASUS lifted the veil over its long-awaited redesigned 9.2mm thin PadFone at the MWC. Sporting a 4.3-inch Super AMOLED qHD display, Snapdragon S4 with the new Adreno 225 GPU, and 8MP camera with LED flash and f/2.2 aperture, as well as 16-64GB of internal storage plus microSD slot, it has what we would expect from a modern high-end. Connectivity is taken care of 42Mbps HSPA+ radio, Wi-Fi, Bluetooth 4.0, HDMI and A-GPS, while a 1,520mAh battery unit is included as a juicer. The Padfone can get inserted into an optional tablet frame, whose 10.1 inch screen then gets powered by the phone itself, and can extend your battery life significantly. There is another dock, which allows you to add a detachable keyboard accessory, like on the Transformer Pad series. This one also comes with a stylus that except for doodling can be used to receive your phone calls as well, considering that the phone is inserted in the mothership.

Explore Google Search

Search is at the heart of everything we do at Google. Our engineers work every day to solve the hardest search problems, and thus improve your online experience. Here's a glimpse at what they do, the features they've built and the remarkable user stories that inspire our work.

Buy 2 Get 1 Free Free Shipping 100% Satisfaction Guarantee Buying Options Tim O'Reilly in a Nutshell Save a Tree - Go Digital What is this? Ebook Free Formats: ePub, Mobi, PDF Tim O'Reilly in a Nutshell

D-Link unveils Cloud Router 1200 and 2000, dishes out WiFi in tube form

oth will let you remotely administrate the 802.11n router's devices from an Android or iOS app, and they both carry four gigabit Ethernet jacks as well as a USB port for some network media storage. The differences lay exclusively in the wireless support, where the single-band 1200 caters to the frugal set at 300Mbps and the simultaneous dual-band 2000 hums along at 600Mbps. Thankfully, the prices of the just-shipping access points are both about right for what you get: the Cloud Router 1200 is a cheap and cheerful $60, and the 2000 won't strain the wallet much more at $100.

Internet Census 2012

Carna Botnet

Abstract While playing around with the Nmap Scripting Engine (NSE) we discovered an amazing number of open embedded devices on the Internet. Many of them are based on Linux and allow login to standard BusyBox with empty or default credentials. We used these devices to build a distributed port scanner to scan all IPv4 addresses. These scans include service probes for the most common ports, ICMP ping, reverse DNS and SYN scans. We analyzed some of the data to get an estimation of the IP address usage. All data gathered during our research is released into the public domain for further study.

3D Printing with Sculptris

Sculptris is a supercool free sculpting tool. You can download it here from Pixologic. Much like ZBrush, Sculptris is a solid-body sculpting tool. Since it has an export function, we can use it for 3D printing too! Unfortunately at this stage we don't yet support OBJ files, so there's a couple of easy hoops you need to jump through to get your design ready. First export your sculpt as an OBJ file:

by Philip J. Corso

Contents Forward Introduction Chapter 01 - The Roswell Desert Chapter 02 - Convoy to Fort Riley Chapter 03 - The Roswell Artifacts Chapter 04 - Inside the Pentagon at the Foreign Technology Desk Chapter 05 - The Cover-up Chapter 06 - The Strategy Chapter 07 - The EBE Chapter 08 - The Project Gets Under Way Chapter 09 - The Project Had Officially Begun Chapter 10 - The U2 Program and Project Corona - Spies in Space Chapter 11 - Project Moon Base Chapter 12 - The Integrated Circuit Chip - From the Roswell Crash Site to Silicon Valley Chapter 13 - The Laser Chapter 14 - The Antimissile Missile Project Chapter 15 - My Last Year in R&D - The Hoover Files, Fiber Optics, Supertenacity, and Other Artifacts Chapter 16 - 'Tesla’s Death Ray' and the Accelerated Particle Beam Weapon Chapter 17 - Star Wars Afterword

A 1-pound, 15-ounce (.875-gram) hailstone

BOULDER, Colo.

ikiLeaks says you can find them through wikileaks.ch, which redirects to a dotted ID. People exchange this information on Twitter. So in a weird sneaker-net sort of way we have implemented a human DNS.

All the while there's a huge glaring 800-pound-gorilla elephant-in-the-room size contradiction. The pols say that businesses can't support WikiLeaks, but the Guardian and the NY Times and the newspapers in Pakistan, Indonesia, Israel -- all over the world -- they're businesses too. So if they're really serious about this, we're in First Amendment territory. They ought to be careful, because the politicians depend on these businesses to sell their product. Without them, they have no way to lie to us.   See the problem isn't that WikiLeaks is lying, the problem is that they're telling the truth. This is not business as usual. 

It seems to me that at the end of this chain is BitTorrent. That when WikiLeaks wants to publish the next archive, they can get their best practice from eztv.it, and have 20 people scattered around the globe at the ends of various big pipes ready to seed it. Once the distribution is underway the only way to shut it down will be to shut down the Internet itself.

Arduino and GSM Cellular – Part One

This is chapter twenty-six of a series originally titled “Getting Started/Moving Forward with Arduino!” by John Boxall – A tutorial on the Arduino universe.

CrazyFlie flight video

The copter itself is organised around the main CPU. The job of this CPU is to acquire the physical measurement given by the gyroscopes and accelerometers and to control the motors to keep the copter stable. This is done by a regulation loop which controls the motors speed 250 times per second. The radio communication has a pretty low bandwidth and is used to send commands to the copter and receive telemetry data from it. The CPU program can be updated by radio.

The computer runs control and telemetry programs. The control program reads the input from a game-pad and sends control commands to the copter. We also have programs that can configure the copter regulation parameters and log the measurements in order to make easier to tune the regulation. All the development is done on Windows and Linux. Indeed we are 3 to work on this project, two of us work on Linux and one is mainly on Windows. Using FLOSS permit to handle that in a very effective way. We are mainly using the GCC compiler from CodeSourcery for the copter program compilation, GNU Make for the project build, Mercurial for the source control, and python/pyusb for the communication with the copter. All these softwares works seamlessly on both Linux and Windows and made the project pretty easy to handle. The distance between the motors (horizontally and vertically) is around 8 cm and the total weight is around 20 g.

Arduino Ethernet is a collection of libraries I have written to use within the Arduino programming environment in conjunction with the Ethernet shield. While the individual libraries are downloaded within a single archive, they do not depend on each other (unless noted otherwise) and can be used independently. The libraries are published under the GPLv2 (or, at your discretion, any later version). Individual libraries EthernetBonjour | Documentation EthernetDHCP | Documentation EthernetDNS | Documentation Also, by popular demand, I've prepared a very simple demo sketch using DNS, DHCP and Bonjour together. Basically, it gets network configuration data via DHCP, then lets you resolve DNS names via the DNS server received from DHCP, all while announcing its DHCP-assigned IP address via link-local Bonjour — Basically a combination of examples from the individual libraries, which I also recommend to look at, as they contain lots of comments explaining how stuff works.