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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

Panasonic releases a solar charger with USB, AA battery slots and LED lights - 0 views

  • The BG-BL01 is a combination device, both solar battery charger and emergency LED Light. The solar power come courtesy of a HIT Solar panel, the same type of current generation panels that are found on homes. The BG-BL01 also comes equipped with a USB port, two AA Battery Charger slots and three LED lights.
Jac Londe

620325 Stirling Engine - ABRA Electronics Inc. - 0 views

  • The 620325 Stirling Engine by Thames and Kosmos uses renewable energy from the sun to drive a generator, which charges a rechargeable battery to power an electric car.
  • Power a Car with Solar Generated Electricity       Discover the Stirling engine, a simple, clean and efficient energy technology that is quickly becoming a viable source of electricity as the availability of fossil fuels declines. The Stirling engine in this kit uses renewable energy from the sun to drive a generator, which charges a rechargeable battery to power an electric car. Named after its inventor, Robert Stirling, the original Stirling engine dates back almost 200 years. Today, high-tech Stirling engines are being used in arrays of giant mirrored solar collectors and common applications like compact generators. NASA is even working on using Stirling engines to power a human outpost on the moon!Like a steam engine, a Stirling engine is a heat engine that converts heat energy into mechanical work, usually to drive a generator that then converts the mechanical energy into electricity. But instead of water and steam, the Stirling engine uses a permanently enclosed volume of gas, such as air or helium, to perform the mechanical work. Stirling engines are highly efficient, can operate very quietly, and can use many different sources of heat: combustion of fuels, nuclear fission, geothermal, or solar heat, as this model uses. The Stirling engine in this kit is located in acharging station with a mirrored parabolic dish. The dish focuses the sun’s rays onto the cylindrical glass bulb of the Stirling engine to heat it up. The air inside the bulb heats up and pushes a piston, which turns an electric generator. The generator produces electricity that charges a rechargeable battery in the car. The car runs on an electric motor powered by the battery.The kit includes the charging station with a beta type Stirling engine, the electric car, and a full-color, 64-page manual.
Jac Londe

DASH7 - Wikipedia, the free encyclopedia - 1 views

  • DASH7 is an open source wireless sensor networking standard for wireless sensor networking, which operates in the 433 MHz unlicensed ISM band. DASH7 provides multi-year battery life, range of up to 2 km, indoor location with 1 meter accuracy, low latency for connecting with moving things, a very small open source protocol stack, AES 128-bit public key encryption support, and data transfer of up to 200 kbit/s. DASH7 is the name of the technology promoted by the non-profit consortium called the DASH7 Alliance.
Jac Londe

Volt - Wikipedia, the free encyclopedia - 0 views

  • 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

Lilliputian Systems - 0 views

  • LILLIPUTIAN SYSTEMS ANNOUNCES WAFER MANUFACTURING SUPPLY AGREEMENT WITH INTEL AND EQUITY STAKE BY INTEL CAPITAL
  • Lilliputian Systems, Inc. (www.lilliputiansystems.com), developer of the world’s first Personal Power™ solution for consumer electronics devices, today announced that it has signed a Wafer Manufacturing Supply Agreement with Intel.  Additionally, Lilliputian Systems announced that Intel Capital, Intel Corporation’s global investment arm, has taken an equity stake in Lilliputian Systems.
  • In connection with the agreement, Intel will manufacture and supply production wafers, which are critical in the production of all of Lilliputian Systems’ product lines, most importantly its first product – the revolutionary USB Mobile Power System.
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  • Wafer manufacturing will be conducted at Intel’s 200mm facility in Hudson, MA, and activities to support this manufacturing will commence immediately. 
  • “Today’s announcement ensures that we can offer our revolutionary Silicon Power Cell™ and Personal Power™ solutions to customers worldwide with industry-leading quality and reliability,” said Mouli Ramani, vice president of Business Development at Lilliputian Systems.
  • About Lilliputian Systems
  • he Company’s breakthrough solution delivers the only viable small form-factor battery replacement that provides the enormous run-time improvements demanded by today’s CE devices.  Lilliputian’s patented Silicon Power Cell™ technology is based on highly efficient and proven solid oxide fuel cells (SOFCs) and microelectromechanical systems (MEMS) wafer fabrication methods, and is fueled by recyclable high energy butane cartridges.  The technology is reliable, FAA approved and environmentally friendly.  Lilliputian’s solution enables longer run-time by providing a 5-10X improvement in volumetric energy density and 20-40X improvement in gravimetric energy density at a fraction of the cost.
Jac Londe

Asus Padfone Unlocked Available (Full Specifications) - 0 views

  • 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.
Jac Londe

Troubled Times: Hand Crank - 0 views

  • The unit is light weight (2.5 lb), portable, low cost ($10-$20) and can be used to recharge single cell batteries at from 1-3.5 amps. It can be made from a cordless electric drill in a primitive environment. The simplest way of how to make a hand crank DC generator using a standard 12, 14.4 or 18 Volt Cordless drill
  • With no modification hook an alligator clip jumper to the two charging terminals (on the bottom that the battery plugs into). See picture below. Note that when a 14.4 Volt drill is laid down pointing to the left then the upper terminal is most likely to be the plus and the lower terminal the minus for these units.
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

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

  •  
    "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

Grundig G2 Reporter | The Eton Webstore - 0 views

  • Grundig G2 Reporter
  • AM-FM-SW-Radio/Recorder Features Digital AM/FM/SW radio with Signal Strength Indicator 248-station Memory Storage 5 Tuning Methods: Jog Tuning, Manual, Auto Tuning, Memory, ATS (Auto Tuning Storage) MP3 and WMA Decode and Recording, E-Book TXT Support Dual Stereo Speakers with Digital Volume Control Record Functions: MIC Record, Line-in Record, Record Radio (able to record while playing) Sleep Timer and Alarm Clock Functions Multiple Language Selection Built-in Flash Memory (4GB) Built-in micro-SD Card Reader (supports up to 16GB) Upgradable Firmware Ports: 3.5mm headphone output, Line-In, MIC, MINI-USB 2.0 Jack (High Speed) Rechargeable Lithium Battery (1250mAh), Charge Through USB Dimensions: 7½" W x 3½" H x 0.8" D (190 x 90 x 21 mm) Weight: 9.6 oz. (272 g)
Jac Londe

Hot Sales!wifi Wireless Hard Disk - Buy Wifi Wireless Hard Disk,16gusb Flash Drive,32g ... - 0 views

  • Wifi Wireless USB Flash drive
  • 1.Battery: 2000mah(about 4H)2.Hi-speed USB 2.03.Mini 5Pin USB interface4.Wifi Wireless Standards: IEEE 802.11b/g/n5.Frequency: 2.4GHz6.Supported Devices,iPad, iPhone, or iPod touch device.Android OS Devices(Tablet, TV, Phone)Smart Phone7.Working Platform:WINDOWS ME/2000/XP/MAC OS/LINUX or later8.Charging while using9. Storage: 16GB-32GB
Jac Londe

Root Android : rooter c'est quoi au juste ? - 0 views

  • Root Android : rooter c'est quoi au juste ?
  • Root : Qu'est-ce que ça veut dire ? C'est quoi au juste ? Dans tout système d'exploitation, il existe au moins un utilisateur suprême qui possède tout les droits sur le système, c'est à dire que ce dernier n'a aucune restriction. Il peut donc tout faire, y compris des bêtises pouvant endommager le système. Cet utilisateur suprême s'appelle administrateur (dans l'univers Windows ) alias "admin" et comme le système android fait partie de la famille GNU/Linux (système d'exploitation libre), cet utilisateur suprême est "Root" ou "Super Utilisateur" alias "SU" pour "SuperUser".
  • Ca permet de faire quoi concrètement à mon système ? Être en Root permet d'avoir le luxe de modifier les paramètres sensibles du système android. Il permet entre autre : d'installer des programmes nécessitant la mise en root tel que les applications de capture d'écran...de supprimer des applications pré-installée lors de l'achatde changer la police d'écriturede modifier la fréquence du processeur pour tirer meilleur profit de la batterie ou augmenter l'autonomie pour jouer à des jeuxde mettre un thème Halloween, Noel Saint valentin et plein d'autrede changer l'écran de chargement lors de l'allumaged'utiliser des logiciels spécifiques (sauvegarde par exemple), avant de mettre comme certains le font une version optimisée (qu'on appelle dans le jargon une rom custom) ou de changer le kerneld'épater les copains
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
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