DIY High Impedance Preamplifier w/2N3904
UobboU Photo Arduino
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Arduino Analog Pins: Setting Up A Photo Interrupter (or Slotted Optical) For Digital Pins (Part 2) | Utopia Mechanicus
As I mentioned in the last post, I finally got my photo interrupter to react under the Arduino, using an Analog pin. Now for my project this was fine, as I had actually allotted one analog pin for this detector, as the digital ones would all be in use. But analog is slow (about 110us), much slower than a digital detect, and I worried this slowness would someday come back and cause problems. So I looked at the circuit I was using, and realized something: the analog output value of 200 was quite low. I was thinking of 255 as the upper limit for analog, but in fact it runs from 0-1023. This means that 200 was about 20% of a full signal, and possibly that was why I couldn’t get a digital reading. So I set about increasing the ‘on’ signal. The pulldown resistor (from ground to the pin, to make ‘0v’ nice and clean) was about 10k; perhaps it was interfering somehow. The next step, now that I had a nice wide range, was to try it on a digital test. So, the moral of the story?
Piloter des dispositifs sans fil
Électronique | Informatique Niveau: Avancé Jonathan Schemoul Montage avec la Leonardo Partie 1: Réception en 433 MHz Vous avez sans doute entendu parler ou vu des détecteurs de fumée, d'ouverture de porte, des télécommandes, des prises murales, etc. sans fil ? Que ce soit les modèles chers que vous trouvez en magasin ou les modèles chinois bon marché, la plupart, s'ils ne sont pas avancés, utilisent la bande de fréquence 433 MHz (n'essayez pas ceux en 315, ils sont illégaux en France). En ce qui concerne ces capteurs en 433 MHz, il se trouve qu'ils utilisent pour la plupart un protocole très simple, introduit par des circuits intégrés chinois à bas coût, les PT2262 côté émission et les PT2272 côté réception (d'autres plus exotiques comme les SC5262 / SC5272, HX2262 / HX2272, EV1527, RT1527, FP1527 ou encore HS1527 peuvent être trouvés et fonctionneront aussi). Regardons de plus près ce que nous avons à disposition : Montage détaillé Niveau détecteurs : Installation de la librairie RC Switch
The 6 Skills Required to be a Good Data Scientist - ANZ Blog
Presenting at Teradata Summit 2014 across Australia and New Zealand this week, Teradata CTO Stephen Brobst discussed the skills that are required to be a good data scientist : - Curiosity: Dives into the data head first. - Intuition: Has good business sense and will explore in directions that yield results but is not afraid to fail. - Data Gathering: Knows how to find data and knows how to design experiments to obtain data when it is not available. - Statistics: Understands causality versus correlation, expected value theory, statistical significance etc. This is different from the base math, but covers the understanding of creating a viable sample size, understanding the basis of valid and sound experiments etc. - Analytic Modelling: Uses historical data to predict the future without over-fitting the data. - Communication: Ability to explain the results of data exploration without using math terms. "So, where do you find people like this? - Give them self-provisioning to data.
Projets DIY - Construire, réparer, détourner
Fabriquer simplement un petit robot suiveur de lumiere Auteur : Olivier Despont Ben Finio a réalisé un petit robot suiveur de lumiere tres simple a réaliser, pour cela, il s'est basé sur le principe du célebre robot BristleBot. Son montage est donc composé de 2 BristeBot reliées, dont chacune est piloté par un capteur de lumiere type LDR ou photorésistance. Pour réaliser ce montage, Ben a utilisé : Une petite breadboard de 170 points 2 X Tete de brosse a dents 2 x Photorésistances (VT935G) 2 X moteurs vibreurs de téléphone portable 2 x Mosfet (IRF 520 TypeN) 2 X Résistances 4,7kΩ (0,25W) quelques wires de prototypages Un support pile et deux piles AAA Apres avoir assemblé tous les éléments sur la breadboard, il a assemblé le bloc pile sur le dessous et a rajouté les tetes des brosses a dents sur les cotés. Un petit peu de décoration en papier pour rendre le robot plus vivant et le tour est joué. Vous pourrez retrouver tous les détails de conception sur www.sciencebuddies.org
ExifTool – Enhanced Java Integration for ExifTool | The Buzz Media
Sections See ExifTool in action here! Description This project represents a robust and seamless Java integration with Phil Harvey’s Perl-based ExifTool. The goal of this project is to provide a well design and performant integration with ExifTool such that integration of ExifTool into any Java application feels completely natural; like using any other Java library where all the concerns of interacting with an external process and/or the more complex concepts in ExifTool itself are abstracted away into simple, Java-provided constructs (e.g. enums, Maps, name/value pairs, etc.) Even the use of more complex features of ExifTool, like “daemon mode”, are abstracted away by this project and simplified into a single line of code change for the caller to take advantage of with no concern for leaking host OS processes or streams; this Java integration will take care of all of that for you automatically. License This software is licensed under the Apache 2 License. What Problem Does this Solve? Benefits
Site du Club de Robotique et d'Electronique Programmable de Ploemeur.
C’est quoi un système d’exploitation ? Présentation et petite histoire de Gnu/Linux Structure d’un système Gnu/Linux Panorama des distributions Linux Les principaux environnements graphiques Voici quelques ressources utiles en lien avec le projet CREPP-Rap : Les pièces imprimables de la CREPP-Rap version stable version développement La documentation de montage de la CREPP-Rap Quezako ? L’impression 3D fait régulièrement la une des journaux, les entreprises s’interrogent, le grand public se pose des questions.Qu’est-ce qu’un fablab ? Le prochain atelier Arduino et Robotique aura lieu le samedi 20 Septembre 2014 au fablab Créa-Fab à l’espace Créa du parc technologique de Soye – Ploemeur. Comme chaque année, l’arrivée du mois de septembre signe le début d’une nouvelle année scolaire… avec son lot d’activités qui redémarrent ! Le prochain atelier Arduino et Robotique aura lieu le samedi 28 Juin 2014 au fablab Créa-Fab à l’espace Créa du parc technologique de Soye – Ploemeur.
Introduction |
Why you should care It’s definitely not a visual RPG Maker or an FPS modder. You’ll get the most out of the engine if you bring some programming aptitude to the table. Java served HOT! Done Right, Java can be blazing fast. Hacker’s Haven jMonkeyEngine is extensible by design. Rapid time to market We believe that Java as a programming language is perfectly suited for efficient and stable game development. Extensive Docs & Support There’s no excuse for poor documentation, and we don’t need one.
Server - Email archiving, email backup and compliance software for Exchange Server, PST files and more
Businesses of all sizes can benefit from the legal, technical, and financial advantages of modern, secure email archiving with MailStore Server. The software creates 1:1 copies of all emails in a central email archive to ensure the security and availability of any amount of data for years to come. Users can still access their email using Microsoft Outlook, MailStore Web Access, or mobile devices such as tablets or smartphones, and search through them at breathtaking speed. Start now and download your free trial! Advantages of Email Archiving Regulatory Compliance and eDiscovery MailStore Server helps companies meet a growing number of regulations on email compliance, eDiscovery, and other legislation. Fast Search Increases Productivity Emails are an important and very extensive knowledge resource. Total Protection Against Data Loss Email can be lost due to technical errors such as corrupt PST files, or deleted by users. Reduce the Workload of Mail Servers Trusted by Over 17,000 Organizations
