SCIENCES POUR TOUS Trucs et astuces de construction Trucs et astuces de construction (difficulté: ** facile) Pour les bricoleurs, SCIENCES POUR TOUS vous propose des petits trucs et des astuces pour faciliter la construction, en vrac : - Pour fabriquer précisément des petites pièces en tôles (acier, aluminium...) Nous réalisons le plan correspondant avec précision sur un logiciel de dessin : Autosketch, à la rigueur Paintbrush... Pour les trous circulaires de plus de 12, nous dessinons des cercles de diamètre 4 qui suivent le contour intérieur du trou. - Pour peindre des petites pièces : nous les trempons directement dans le pot de peinture puis nous égouttons : pas de traces de pinceau, un minimum de vaisselle! - Une solution pour faire sécher les pièces peintes ou collées (Araldite...) : la rôtissoire du four familial : four éteint ou très faible (pas plus de 80° pour l'Araldite), on fixe la pièce sur l'axe du tourne-broche (pinces à linges...) et on met en route : la pièce tourne et la colle ne coule pas! Des adresses de fournisseurs:
t r o n i x s t u f f Théorie - Optocoupleur Electronique > Théorie > Optocoupleur Dernière mise à jour : 03/11/2009 Présentation Un optocoupleur est un composant ou un ensemble de composants qui permet le transfert d'informations entre deux parties électroniques isolées l'une de l'autre d'un point de vue électrique. La première partie est un émetteur, et la seconde partie est un récepteur. Forme et représentation électronique de l'optocoupleur Il existe plusieurs sortes de boitiers pour les optocoupleurs. Les boitiers DIL6 et DIL8 sont standardisés, les brochages montrés ci-avant (DIL6 et DIL8) correspondent à ce qu'on trouve quasiment tout le temps. Quelques exemples d'optocoupleurs Simples : 4N25, 4N28, SL5500, 4N33, 6N136, 6N137, 6N138, 6N139, CNY17-2, CNY70, MCT8, NSL32SR2 (LED + LDR)Simple DC/AC : TLP620, TLP2531 ou HCPL2531Doubles : TLP504A, MCT6 Quadruples : TLP504A2 Pourquoi utiliser un optocoupleur ? Technologies employées Caractéristiques principales d'un optocoupleur Temps de propagation Vitesse de transfert (ou Débit)
Parts & Kits for Arduino Online, Buy Microcontroller Boards, Electronic Components for Arduino - Welcome - Freetronics Dissection of a DVD writer Dissection of a DVD writer Ok, here is the ‘Victim’ a Sony DWD28Q 16x dual layer DVD writer And the underside: Now remove the four Philips screws & void the warranty seal ;-) Now release the left hand PCB First release the zif as shown by pushing the brown bar to the right Release the PCB retaining catch and lift the PCB upwards. Release two more zifs on the underside of the PCB Now you can see the optical assembly (riding on the two slide rails) Now the brute force bit – detach the rails. And here is the liberated optical assy. Now is a good time to short out the diodes to prevent static damage. Remove all screws. Prise the write diode (the one you really want) to the right to break the adhesive & cut flexi. The two laser diodes (DVD r/w on the left, CD r/w on the right) Now you could glue a collimating lens to the diode …. And using a prototype laser diode driver. I have measured 60mW out t 100mA drive A nice, well collimated spot. Scanning by hand, the laser is modulated by a 1kHz square wave.
Arduino Resources Arduino Resources I really love cheat sheets. In a lot of cases they can take the place of an entire manual. So I was surprised, given its popularity that I couldn’t find a single-page reference for the arduino online. I tried to make a sheet that captured all the things I hit the reference for while programming. What data type does the millis() function return? Any other things you’d like to see added, send me an email and I’ll stick them on Rev 3! Edit: Thanks to Macca and TBAr for their feedback. Download: PNG PDF Visio —- Gavin
C328R Jpeg camera and .NET Micro Framework | Pavel Bansky One of the cool devices I wanted to get work with .NET Micro Framework was a camera. Problem with most of the camera is, that it's using almost 20 pins when connecting to CPU. There are eight pins for Y-bus (gray-scale image) next eight for U-bus (color channel) and three pins for clock, frame-sync and h-sync. After that, camera is usually required to be connected over I2C, for configuration settings (brightness, contrast, rotation etc.) Luckily there is the company called COMedia Ltd., producing still image cameras connected over serial interface. C328R camera module C328R Jpeg Compression VGA Camera Module C328R is neat camera which can be purchased with different lenses. The best feature on this camera is ability to produce directly Jpeg images or 'raw' format images in different color depth and sizes. Connecting camera with Tahoe development board is simple. Connecting power Connecting serial interface Camera driver C328R bottom view Initializing camera driver Taking pictures Conclusion
Thingiverse - Digital Designs for Physical Objects ALLDATASHEET.COM - Datasheet search site, Datasheet search site for Electronic Components and Semiconductors and other semiconductors.-Mozilla Firefox What is Arduino? Learn About This Open-Source Electronics Platform Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. Today we will help you get started by showing you some of the options available and how easy it is to get started. Arduino hardware is an open-source circuit board with a microprocessor and input/output (I/O) pins for communication and controlling physical objects (LED, servos, buttons, etc.). Arduino also has an open-source software component which is similar to C++. All of this was designed to be easy to use to let artists and makers freely develop their ideas into real objects. Arduino Variants The Arduino hardware being “open-source” means that you can view schematics of every board available. The image below was created using Fritzing and is the layout for a basic Arduino using a bread board. The Arduino comes in a variety of different types that make choosing the right one difficult to decide, but variety also allows for flexibility in choosing the perfect solution. XBee