HMC5883L Compass Tutorial with Arduino Library - Tutorials - Love Electronics Using a magnetometer can be a little tricky, especially if your unsure about the formulas to use to get the correct bearing and when other magnetic objects are interfering with your signal. We've created a library for our HMC5883L Breakout Board , which will also be compatible with other HMC5883L breakout boards made by other manufacturers. Join us whilst we cover the following: Understand what is a magnetometer and how they work. Introduce the HMC5883L Arduino Library Explain how to extract data from the HMC5883L. How do compasses work? Firstly an introduction, a (standard handheld) compass works by aligning itself to the earths magnetic field. Our magnetometer uses these magnetic fields, however it doesn't pull on a little needle inside it! How do we use one? Okay, so now we know how to use one, the first step is to get some data out of our compass. Once you have the library installed start your Arduino IDE and we can get coding. Using the HMC5883L Arduino Library Wire.begin();
Régulation PID, comment la régler 1/2 | rhaaa Étant donné que je n’ai pas encore tout le matériel nécessaire pour avancer mes autres projets, j’en profite pour approfondir un peu mes connaissances théoriques et vous en fait donc profiter. Mon projet ici est simple : Réguler une température à l’aide d’un microcontrolleur, mais surtout bien comprendre les tenants et aboutissements des différents réglages et algorithmes. L’objectif ici n’est pas tant d’expliquer ce qu’est un PID, ni comment il fonctionne dans le detail, mais plutôt de donner une méthode permettant d’approximer les coefficients du régulateur. Je profiterais de cette expérience pour faire 2 articles : – celui-ci concernant le PID a proprement parler – Un second article concernant ma méthode pour obtenir des courbes « lives » a partir d’un arduino et d’un PC. Qu’es-ce qu’un PID Pour simplifier, on parlera dans la suite de régulation de température, vu que ce sera notre application ici. Formule PID, source ControlGuru Description du materiel Méthode de réglage Définitions Avec:
xoscillo - A software oscilloscope that acquires data using an arduino or a parallax (more platforms to come). About This is a multiplatform software oscilloscope and logical analyzer. It supports arduino(with custom firmware) and a Parallax USB oscilloscope. More platforms to come. Features Panoramic view Load and save waveforms Zoom in and out Can open several waveforms at the same time Can run several oscilloscopes/logical analyzers simultaneously Frequency analysis using FFT Filtering, so far it has a low pass filter, probably more to come. Supported platforms Support Ask here in our forum Screenshots Basic screen shot showing the oscilloscope displaying a simple waveform Logic analyzer screenshot Displays the FFT of the signal and underneath the FFT over time. This screen shot shows an arduino based oscilloscope and a parallax one working simultaneously in realtime. Linux Notes from the Author The code is not by any means great, its just a quick exercise I did to learn c#. License
Implémenter un PID sans faire de calculs ! » Sciences et Techniques Sur beaucoup de site sur le web, lorsque l'on trouve un article parlant de la régulation PID, on se heurte souvent à des fonctions de transfert et à des équations dans le domaine de Laplace. Alors implémenter un PID est-il impossible sans avoir une base solide en mathématiques ? Heureusement non, loin de là. Outre l'approche mathématiques, le PID peut très bien s'expliquer de façon intuitive "avec les mains". Le but de cet article est justement d'essayer d'expliquer comment marche une régulation PID sans entrer dans les calculs ni sans utiliser les fonctions de transfert du système et autres équations quelque peu cabalistiques pour les non-initiés. Imaginez que vous conduisez votre voiture sur l'autoroute et que vous souhaitez stabiliser votre vitesse à 130 km/h pil-poil ! Règle 1 : Avec cette méthode, pas de problème. Règle 2 : C'est alors que vous vous dites : " Zut ! Règle 3 : Arrivé à 130km/h, vous vous dites : " ça y est, j'y suis ! Le régulateur proportionnel (P : première règle)
We interrupt this program to bring you an Arduino interrupt tutorial Ah yes… the wonderful and oft-misunderstood world of microcontroller interrupts. Are you looking to build a project that relies on very precise timing or needs to react quickly to an input? Then don’t change that channel, my friend. In this tutorial we’ll cover what interrupts are, what they do, and how to use them. What is an interrupt? On a very basic level, an interrupt is an signal that interrupts the current processor activity. ISR? If you’re new to the world of software development, you might wonder why all this complication is necessary just to respond to external events. You certainly can do all of these things in your main code, but interrupts give you a key advantage – they are asynchronous. Let’s use a real-world example. Instead, imagine if the package was sent Fedex or UPS with delivery confirmation. The AVR chips used in most Arduinos are not capable of parallel processing, i.e. they can’t do multiple things at once. Types of Interrupts Implementing an interrupt in a program
PID Theory Explained 1. Control System The basic idea behind a PID controller is to read a sensor, then compute the desired actuator output by calculating proportional, integral, and derivative responses and summing those three components to compute the output. Before we start to define the parameters of a PID controller, we shall see what a closed loop system is and some of the terminologies associated with it. Closed Loop System In a typical control system, the process variable is the system parameter that needs to be controlled, such as temperature (ºC), pressure (psi), or flow rate (liters/minute). In many cases, the actuator output is not the only signal that has an effect on the system. Figure 1: Block diagram of a typical closed loop system. Defintion of Terminlogies The control design process begins by defining the performance requirements. Figure 2: Response of a typical PID closed loop system. Some systems exhibit an undesirable behavior called deadtime. Back to Top 2. 3. Table 1. 4. [+] Enlarge Image
Welcome GamePack Were you ever the kind of person to hack up your own Playstation controllers and hook it up to something else? Well, those shards of plastic can be mighty dangerous, so I’ve done it for you. And hey, with the GamePack you’ll even have something you can hook it up to. The GamePack comes with an Arduino, MeCap Backpack, TouchShield Stealth or Slide, ExtenderShield and an InputShield- everything you need to create your own open source, portable gaming device. I’ve just added a new option for wide screen that includes the new TouchShield Slide. Components Specifications TouchShield Slide: 320×240 LCD Screen Resistive Touch Screen Holds 60 128×128 bitmap images Compatible with Arduino Environment Only Uses Arduino Pins: 3 and 4 Graphics Library Ready to Go Draw Shapes, Pixels, Colors, Graphs, Buttons 2.83 inch diagonal Tutorials/Blogs Reference and Firmware Media Another shot of the Open Source Gameboy Project
Towards a sensor commons | Technology Treason The Internet of Things, a term being bandied to the point of almost meaninglessness now it’s hit the mainstream of the NYT and the BBC. Yet, while the mainstay of the media struggles to describe how and why smart sensor arrays are going to mean you spend less time in traffic, ultimately pay more for your electricity but make sure your fruit is always fresh, there is a quiet revolution taking place. The action taking place is the creation of what I call the Sensor Commons. Why is this a revolution? Because as a population we are deciding that governments and civic planners no longer have the ability to provide meaningful information at a local level. Two posts summarise this activity and its implications beautifully for me. The first, by Ed Bordern from Pachube, is on the creation of a community driven Air Quality Sensor Network. The implications of this quiet revolution are discussed by Jauvan Moradi in his post on how open sensor networks will affect journalism. Gaining trust Price
Power Protection Circuits [419] | General Electronics | Electronics Written by Jon Chandler Published on 18 December 2011 Hits: 16366 Multithumb found errors on this page: There was a problem loading image ' There was a problem loading image ' Non-Lexical Vocables PhotoThe real world can be a harsh environment for your project when it's ready to leave the work bench. This is a typical circuit power supply connection. the power supply could be a battery, a vehicle power supply or an AC adapter. With a circuit of the first type, there is no protection against reverse polarity, over voltage or under voltage. With a circuit of the second type with a voltage regulator, there is usually no protection against reverse polarity although some regulators do provide this feature. The addition of a simple power diode provides protection against reverse polarity. This method also uses a power diode, this time in parallel with the power supply.
Circuit Playground XBee® Shield Introduction A Xbee shield allows an Arduino or Seeeduino board to communicate wirelessly using Bee compatible modules (like Zigbee or BlueTooth Bee). It is designed to be used with Xbee module from MaxStream. It can be used as a Serial Port / USB replacement. It is used to connect two Seeeduinos using Zigbee / Bluetooth Bee or connect a Seeeduino with PC Wirelessly. Two toggle switches decides how Rxd and Txd pins of Bee modules be connected to Seeeduino pins. Model:WLS114A0P Seeed Studio's XBee®_Shield is derived from Arduino Xbee shield, with following features: Smaller form SMT package for most of the components Low cost To use X-CTU with Seeeduino, please upload following sketch void setup() { DDRB=0; DDRC=0; DDRD=0; } void loop() { } Features 31mm X 41mm board. Application Ideas Cautions Set the toggle switches to correct position before connecting to Bee Modules or Arduinos. Schematic Specification See features above. Mechanic Dimensions XBee® Shield is of 3.1cm X 4.1cm size. Usage Programming