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Jac Londe

Weber (unit) - Wikipedia, the free encyclopedia - 0 views

  • Weber (unit) From Wikipedia, the free encyclopedia Jump to: navigation, search In physics, the weber (symbol: Wb;  /ˈveɪbər/, /ˈwɛbər/, or /ˈwiːbər/) is the SI unit of magnetic flux. A flux density of one Wb/m2 (one weber per square meter) is one tesla. The weber is named for the German physicist Wilhelm Eduard Weber (1804–1891). [edit] Definition
  • The weber may be defined in terms of Faraday's law, which relates a changing magnetic flux through a loop to the electric field around the loop. A change in flux of one weber per second will induce an electromotive force of one volt (produce an electric potential difference of one volt across two open-circuited terminals). Officially,
  • Weber (unit of magnetic flux) — The weber is the magnetic flux which, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second.[1]
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  • In SI base units, the dimensions of the weber are (kg·m2)/(s2·A). The weber is commonly expressed in terms of other derived units as the Tesla-square meter (T·m2), volt-seconds (V·s), or joules per ampere (J/A). 1 Wb = 1 V·s = 1 T·m2 = 1 J/A = 108 Mx (maxwells).
Jac Londe

Arduino - Introduction - 0 views

  • What is Arduino?
  • Arduino is a tool for making computers that can sense and control more of the physical world than your desktop computer. It's an open-source physical computing platform based on a simple microcontroller board, and a development environment for writing software for the board.
  • Inexpensive - Arduino boards are relatively inexpensive compared to other microcontroller platforms. The least expensive version of the Arduino module can be assembled by hand, and even the pre-assembled Arduino modules cost less than $50
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  • Cross-platform - The Arduino software runs on Windows, Macintosh OSX, and Linux operating systems. Most microcontroller systems are limited to Windows.
  • Simple, clear programming environment - The Arduino programming environment is easy-to-use for beginners, yet flexible enough for advanced users to take advantage of as well. For teachers, it's conveniently based on the Processing programming environment, so students learning to program in that environment will be familiar with the look and feel of Arduino
  • Open source and extensible software- The Arduino software and is published as open source tools, available for extension by experienced programmers. The language can be expanded through C++ libraries, and people wanting to understand the technical details can make the leap from Arduino to the AVR C programming language on which it's based. SImilarly, you can add AVR-C code directly into your Arduino programs if you want to.
  • Open source and extensible hardware - The Arduino is based on Atmel's ATMEGA8 and ATMEGA168 microcontrollers. The plans for the modules are published under a Creative Commons license, so experienced circuit designers can make their own version of the module, extending it and improving it. Even relatively inexperienced users can build the breadboard version of the module in order to understand how it works and save money.
Jac Londe

Portable PA Systems. AmpliVox Wireless Powered Speaker Voice Projector Kit - 0 views

  • AmpliVox Wireless Powered Speaker Voice Projector Kit This is the most professional and simple solution in wireless presentations systems on the market with black carpeted acoustic speakers and wireless 50 watt amplifier. Adds S1204 Remote Wireless Speaker, universal carrying case, and Two Tripods to The Voice Projector (SW225) for your complete presentation kit!
  • Product Description Audience Size: up to 2,000. Room Size: up to 20,000 sq. ft. No messy cables to trip over. This is a professional portable public address complete sound system with built-in wireless in a  compact lightweight black carpeted cabinet PLUS a wireless powered dual module speaker that can be placed up to 300 feet away. The Wireless Voice Projector is a complete sound system that contains AmpliVox’s powerful 50 watt multimedia stereo amplifier with built-in receiver and 3 mic inputs plus two built-in Jensen designed 6” x 8” oval speakers.  The Powered Dual Module Speaker has a built-in 50 watt amplifier. With built-in tripod mounts both components are designed for placement on a tripod, media cart, or permanent mounting.  The SW225 Wireless Voice Projector can dramatically enhance presentations and communication with mixed media sound line-in for CD tape player or computer projector. It includes both headset and lapel mic and transmitter plus audio cables for laptop & projector.  Each component can be powered with 10 D-cell alkaline batteries (not included) for up to 200 hours; S1460 International AC Adapter/recharger; or S1465 Rechargeable Nicad Battery Pack (requires S1460). Features • Wireless Voice Projector with 2 built-in Jensen speakers • Wireless powered dual module speaker (total of 4 speakers) • For audience size up to 2,500 • For rooms up to 20,000 sq. ft. • 50W multimedia stereo amplifier with built-in receiver • Includes lapel & headset mic with transmitter • Dual Wireless Capability: 2 presenters can be wireless with optional 2nd wireless mic kit. • Built-in Tripod Mount • 2 Tripods • Rugged nylon reinforced Carrying Case on Wheels with Luggage handle What's in the Box • Wireless Voice Projector (SW225) • Wireless powered dual module speaker • Lapel & headset mic with transmitter • 2 Tripods • Rugged nylon reinforced Carrying Case on Wheels with Luggage handle Warranty 6 Years Electronics
Jac Londe

Daedalus Projects - 0 views

  • 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.
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  • The top of the board contains the sensors and the control/communication electronic: The JTAG/Serial connector permit to program the processor and to communicate debug messages. The Main CPU is a STM32 Cortex-M3. It is clocked at 64MHz from the internal oscillator. The 2 Axis X-Y Gyro is an invensense IDG500. It has an analog output and thus is connected to the CPU analog to digital converters. The 1 Axis Z gyro is an invensense ISZ500. As the X-Y gyro this is an analog chip connected to the CPU analog to digital converters. The 2.4GHz Radio is based on a nRF24L01+ chip from Nordic Semiconductor. It is actually a breakout board sold by SparkFun. The radio is connected to the CPU via a SPI port. The 3 Axis Accelerometer is a SMB380 from Bosch. It is connected to the CPU via an I²C bus.
  • Here nothing particular, except that the little battery is taped on the bottom of the copter. The battery comes from a Silverlit x-twin plane and actually permit 4.5min of flight time.
  • Under the battery we mostly have power supply and the “power” electronics: The charge connector accepts 5V and permits to charge the battery The power switch permits to power the copter either from the charge connector or from the battery. The 5V step-up permits to increase the power voltage from the 3~4V coming from the battery to 5V. The two 3.3V linear regulators, reduces the 5V to power the copter electronic. The digital and analog 3.3V are generated independently. This was made to reduce the noise on the analog components (here it is the two gyros, a quite critical part). Finally at the four sides we have the motors transistors. The power for the motors pass on the top and bottom of the part of PCB that hold the motors. It can be noted that we also have the battery charging chip just at the right of the 3.3V regulators. It is a classical MAX1555 and is working pretty well. The idea with the step-up was to get a more stable voltage when the battery is depleted and also to remove some of the noise coming from the motor electonic. Anyway, this boars is capable to work without by using 2.8V linear regulators instead. So most likely the step-up will be excluded on the next version and we also plan to integrate the radio on board. The motors and propellers are taken from a Silverlit X-twin plane. They are powered by the battery voltage.
  • The copter is controlled via a python program running on the PC. A Playstation bluetooth gamepad is used to pilote it.
Jac Londe

GlobalScale Technologies - D2Plug - 1 views

  • D2Plug is a Developer Kit for the Marvell PXA510 Highly Integrated SoC with PC-like performance.
  • The D2plug can be used by software developers, Independent Software Vendors (ISV), and System Integrators (SI); for evaluation, Application development, Rapid Prototyping, and interoperability testing for a “cloud” based service deployment. The complete solution in an attractive, innovative and “fan-less” enclosure will also be available for bundling solutions for product release with custom branding.
Jac Londe

ASUSTeK Computer Inc. - Eee- ASUS Eee Pad Transformer TF101 - 0 views

  • Eee Pad Transformer TF101
  • NVIDIA® Tegra™ 2 1.0GHz dual-core CPU for excellent multitasking & HD video playback Android 3.2 Honeycomb O.S. with Adobe® Flash® 10.2 support*2 Full QWERTY keyboard, touchpad input with Polaris® Office® for mobile productivity 16*1 hours long battery life for all day computing with mobile docking Brilliant IPS panel with ultra-wide 178⁰ viewing angle made from scratch resistant and super tough glass One year of Unlimited ASUS WebStorage, two USB ports, SD and Micro SD card readers for easy sharing & storage expandability. 3D stereo with max bass response with SRS premium sound
Jac Londe

AVG Antivirus and Security Software - Virus Removal - 0 views

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    Antivirus and internet security protection for home and business. 24/7 support and high-speed automatic updates. Products ranging from maximum protection, to basic antivirus protection available for free download.
Jac Londe

MINIWIZ - [ miniSOLAR | HYmini ] - A revolutionary way of capturing renewable power for... - 0 views

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    "SolarBulb™ is a solar powered LED lamp that fastens onto conventional beverage containers and lights up automatically in the dark; controlled by a built-in light sensor. Just leave the SolarBulb™ in the sun for 4 hours, and receive 6 full hours of continuous LED lighting. SolarBulb™ has the unique sunflower-like design; its solar panel attached head is adjustable in whichever direction of the sun."
Jac Londe

Tor Project: Overview - 0 views

  • Overview
  • Tor is a network of virtual tunnels that allows people and groups to improve their privacy and security on the Internet. It also enables software developers to create new communication tools with built-in privacy features. Tor provides the foundation for a range of applications that allow organizations and individuals to share information over public networks without compromising their privacy. Individuals use Tor to keep websites from tracking them and their family members, or to connect to news sites, instant messaging services, or the like when these are blocked by their local Internet providers. Tor's hidden services let users publish web sites and other services without needing to reveal the location of the site. Individuals also use Tor for socially sensitive communication: chat rooms and web forums for rape and abuse survivors, or people with illnesses.
Jac Londe

U49325 Sun Runner Stirling Engine - ABRA Electronics Inc. - 0 views

  • The U49325 Sun Runner Stirling Engine is a solar-powered Stirling Engine which offers a dramatic demonstration of energy conversion.   This motor and its parabolic mirror can be attached to any conventional camera tripod. When properly aimed at the sun, the polished aluminum parabolic mirror focuses incoming solar energy on the heat cap of the engine, which is converted to rotary motion. Unit comes complete with motor, parabolic mirror, and wrenches. Standard camera tripod is not supplied. This engine is completely assembled and ready to run. Each unit is test run at the factory prior to shipping. Motor runs at 2,000 RPM and up. This engine can also run as a horizontal engine with an alcohol burner. Demonstrate this exciting method of harnessing the sun’s clean and renewable energy to your students.  Weight: 6.00 lbs Dimensions: Engine: 8.25 x 3 inches (L x W) Flywheel: 3.25 inchesParabolic Mirror: 18 inch diameterPlease note that this item is designed to demonstrate the operating principles of a Stirling engine for educational use and is not designed for power production.  It can potentially be coupled with a generator for producing very small amounts of electricity but is incapable of powering anything beyond a small light bulb or LED.
Jac Londe

2160p - Wikipedia, the free encyclopedia - 0 views

  • 2160p is the shorthand name for Quad Full High Definition (QFHD), a video mode planned to appear in future HDTV products.[1] It has a resolution of 3840×2160 (8.3 megapixels in the 16:9 aspect ratio) and is one of the levels of 4K resolution.[2][3][4] The number 2160 stands for 2,160 lines of vertical display resolution, while the letter p stands for progressive scan or non-interlaced. In a progressive image, the lines of resolution of the image go from the top of the screen to the bottom.
Jac Londe

Two military spy telescopes, just as big and powerful as Hubble, donated to NASA - 0 views

  • Two military spy telescopes, just as big and powerful as Hubble, donated to NASA
  • The telescopes were built by private contractors for the National Reconnaissance Office, one of 16 U.S. intelligence agencies. Each have 2.4-meter (7.9-foot) mirrors, just like the Hubble, but they have 100 times the field of view.
  • the telescopes, built in the late 1990s and early 2000s, are now technologically outdated, at least for intelligence operations, despite being just as powerful as Hubble. Now that something that’s worth taking into consideration. Moreover, these telescopes worth hundreds of millions of dollars have never seen operation! Instead they’ve been shelved in a warehouse somewhere, of course, classified. And they might find themselves, yet again, blocked in a warehouse, since NASA, on a string budget, doesn’t have the necessary cash to fit them.
Jac Londe

Oyetools.com - 0 views

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    Free whois service for everyone
Jac Londe

'Anti-Facebook' project nears launch | Software, Interrupted - CNET News - 0 views

  • open-source social networking project Diaspora
  • if the team is half as good at building software as it is at building hype, there might be something interesting in the upcoming release, and maybe even a viable business.
  • The big challenge is that the enterprise developer world isn't screaming out for an open-source Facebook, nor are consumers really looking to run their own instances of social networks. What they really want is for Facebook to take privacy more seriously
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  • And for those who do want to run their own social sites, there are any number of options, including Ning and Buddypress as well as extensions to Drupal and other publishing systems. Additionally, a number of other companies, including Ringside Networks, founded by JBoss alumni, took a run at developing a social application server only to find a lack of market.
Jac Londe

What is WiMAX? | General | WiMAX FAQ - 0 views

  • WiMAX is a wireless digital communications system, also known as IEEE 802.16, that is intended for wireless "metropolitan area networks". WiMAX can provide broadband wireless access (BWA) up to 30 miles (50 km) for fixed stations, and 3 - 10 miles (5 - 15 km) for mobile stations. In contrast, the WiFi/802.11 wireless local area network standard is limited in most cases to only 100 - 300 feet (30 - 100m).
Jac Londe

Pingdom Web site monitoring for 100% uptime. Measure your downtime. - 0 views

shared by Jac Londe on 19 Aug 09 - Cached
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    Pingdom web site monitoring and other infrastructure for you and instantly let you know when anything goes wrong. Measure uptime and downtime.
Jac Londe

Find Your IP and MAC Addresses On Windows XP | 2000 | NT - 0 views

  • Click the Start menu button on the Windows taskbar.Click 'Run...' on this menu.Type 'cmd' in the text box that appears. A command prompt window launches on the desktop.In this command window, type 'ipconfig /all'. Details are shown for each of the computer's network adapters. Computers installed with VPN software or emulation software will possess one or more virtual adapters.The 'IP Address' field states the current IP address for that network adapter.The 'Physical Address' field states the MAC address for that adapter.
Jac Londe

Processing.org - 0 views

  • Processing is an open source programming language and environment for people who want to create images, animations, and interactions. Initially developed to serve as a software sketchbook and to teach fundamentals of computer programming within a visual context, Processing also has evolved into a tool for generating finished professional work. Today, there are tens of thousands of students, artists, designers, researchers, and hobbyists who use Processing for learning, prototyping, and production.
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