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Jac Londe

Fullscreen Image 3D Effect with CSS3 and jQuery - 0 views

  • Fullscreen Image 3D Effect with CSS3 and jQuery
Jac Londe

2mp Auto Focus Mini Board Camera - Buy Board Camera,2mp Auto Focu Camera Module,Mini Board Camera Product on Alibaba.com - 0 views

  • 2MP Auto Focus mini Board Camera
  • 2MP Auto Focus mini Board Camera 1. 2MP 2. Autofocus Board Camera 3. USB interface Model NameUM2CU  2MP Auto Focus Board CameraInterfaceUSB CMOS CameraResolution 2.0MegapixelFocus Type AutofocusUVC YesMicrophoneNoEffective Distance6 cm to infinityF No.F 2.8View Angle58.5 ( FOV )Frame Rate30 fpsDimension38.0mm(L) X 9.8mm(W) X6.55mm(H)OS SupportedWindows XP, Vista, Windows 7,                          Linux Kernel 2.6                MAC OS 10 or above
  • Specifications
Jac Londe

Usb2.0 High Speed Uvc Driverless 2m Fix Focus Cmos Camera Module For Mobile Phone - Buy Camera Module,Cmos,Module Product on Alibaba.com - 0 views

  • Specifications 1. UVC Driverless 2. 2MP Fix Focus Model NameUM2BU 2M Fix Focus CMOS Camera ModuleInterfaceUSB CMOS CameraResolution2.0 MegapixelFocus TypeFix FocusUVCYesMicrophoneNoEffective Distance30cm to infinityF No.F 2.8View Angle59.9( FOV )Frame Rate30 fpsDimension38mm(L) X 9.8mm(W) X5.46mm(H)OS SupportedWindows XP, Vista, Windows 7,Linux Kernel 2.6 MAC OS 10 or above
Jac Londe

Vga 0.3 Megapixel Camera Module - Buy Camera Module,Usb Pc Camera Module,Cmos Camera Module Product on Alibaba.com - 0 views

  • VGA 0.3 Megapixel Camera Module
  • Specifications VGA 0.3Megapixels Camera Module Model NameUM72U VGA 0.3Megapixels Camera ModuleInterfaceUSB CMOS CameraResolutionVGAFocus TypeFixfocusUVCYesMicrophoneNoEffective Distance30 cm to infinityF No.F 2.8View Angle67° ( FOV )Frame Rate30 fpsDimension43.0mm(L) * 9.0mm7.5(W) *4.5mm(H)OS SupportedWindows XP, Vista, Windows 7,                                                                                           Linux Kernel 2.6                                                                                           MAC OS 10 or above
Jac Londe

Light-emitting diode - Wikipedia, the free encyclopedia - 0 views

  • Light-emitting diode
  • A light-emitting diode (LED) is a semiconductor light source.[3] LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962,[4] early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet, and infrared wavelengths, with very high brightness. When a light-emitting diode is forward-biased (switched on), electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence and the color of the light (corresponding to the energy of the photon) is determined by the energy gap of the semiconductor. LEDs are often small in area (less than 1 mm2), and integrated optical components may be used to shape its radiation pattern.[5] LEDs present many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved robustness, smaller size, and faster switching. LEDs powerful enough for room lighting are relatively expensive and require more precise current and heat management than compact fluorescent lamp sources of comparable output. Light-emitting diodes are used in applications as diverse as aviation lighting, automotive lighting, advertising, general lighting, and traffic signals. LEDs have allowed new text, video displays, live video, and sensors to be developed, while their high switching rates are also useful in advanced communications technology. Infrared LEDs are also used in the remote control units of many commercial products including televisions, DVD players, and other domestic appliances.
Jac Londe

Solar power, with a side of hot running water - 0 views

  • The conversion of sunlight into electricity has been dominated by photovoltaic and solar thermal power generation. Photovoltaic cells are deployed widely, mostly as flat panels, whereas solar thermal electricity generation relying on optical concentrators and mechanical heat engines is only seen in large-scale power plants. Here we demonstrate a promising flat-panel solar thermal to electric power conversion technology based on the Seebeck effect and high thermal concentration, thus enabling wider applications. The developed solar thermoelectric generators (STEGs) achieved a peak efficiency of 4.6% under AM1.5G (1 kW m−2) conditions. The efficiency is 7–8 times higher than the previously reported best value for a flat-panel STEG, and is enabled by the use of high-performance nanostructured thermoelectric materials and spectrally-selective solar absorbers in an innovative design that exploits high thermal concentration in an evacuated environment.
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.
  • ...4 more annotations...
  • 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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