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Jac Londe

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

en.wikipedia.org/...Weber_(unit)

weber wikipedia unitesla onde

shared by Jac Londe on 06 May 12 - No Cached
  • 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

Volt - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/Volt

wikipedia onde unitesla volt

shared by Jac Londe on 06 May 12 - No Cached
  • Volt From Wikipedia, the free encyclopedia Jump to: navigation, search For other uses, see Volt (disambiguation). Josephson junction array chip developed by NIST as a standard volt The volt (symbol: V) is the SI derived unit for electric potential, electric potential difference, and electromotive force.[1] The volt is named in honor of the Italian physicist Alessandro Volta (1745–1827), who invented the voltaic pile, possibly the first chemical battery.
  • A single volt is defined as the difference in electric potential across a wire when an electric current of one ampere dissipates one watt of power.[
Jac Londe

Arduino - Introduction - 0 views

arduino.cc/Introduction

opensource electronics arduino tool introduction tutorial

shared by Jac Londe on 19 May 11 - Cached
  • 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

Cambridge Digital Library - University of Cambridge - 0 views

cudl.lib.cam.ac.uk/...newton

newton science digital library cambridge physics university history manuscritos

shared by Jac Londe on 04 Jun 12 - No Cached
  • Newton Papers Plato is my friend, Aristotle is my friend, but my greatest friend is truth." —Sir Isaac Newton
Jac Londe

My N3RD: Connect and Control Anything from Anywhere by Wild Hare, LLC. - Kickstarter - 0 views

www.kickstarter.com/...control-anything-from-anywhere

control anything automation home homauto mobile

shared by Jac Londe on 21 Jan 14 - No Cached
  • What is My N3RD? My N3RD (Pronounced Nerd) turns your smartphone into a remote control for every gadget, vehicle and appliance you own. It works with the My N3RD app to upgrade ANY switch into a wireless controlled, programmable, and automatic smart switch, updating all of your devices into intelligent connected ones. Connect and control devices directly. No internet connection or router required.   Works with DC and mobile applications such as Cars, RVs, and boats. With My N3RD, you aren’t just limited to home appliances. Connects to any switch, enabling you to upgrade virtually anything— not just simple appliances like fans and lights. Simple setup. You only need to configure functions in the App once, and you can reuse them again and again. My N3RD is equipped with two relays and two inputs that can be used with external switches and physical switches to create a wide variety of uses. My N3RD is smart. You can program My N3RD to act without your intervention. Use the app to set timers for appliances and electronics. Although My N3RD has direct connect capability, it can also be connected through your home WiFi so you can control your devices from anywhere. Upgrade anything to an Internet of Things device.
Jac Londe

HackerspaceWiki - 0 views

hackerspaces.org/...Hackerspaces

hackerspace community hacking culture geek hacker computer diy arrduino

shared by Jac Londe on 09 Aug 11 - Cached
  • Hackerspaces
  • Hackerspaces are community-operated physical places, where people can meet and work on their projects. This website is for 'Anyone and Everyone',who wants to share their hackerspace with international hacker's'paces.
Jac Londe

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

compnetworking.about.com/...findaddrwinxp.htm

ip find mac Networking xp bss bssid address mapping addresses

shared by Jac Londe on 22 Apr 11 - Cached
  • 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

Daedalus Projects - 0 views

www.daedalus.nu

projects daedalus science tools copter

shared by Jac Londe on 30 Apr 11 - No Cached
  • 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.
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