background preloader

Javanotes 6.0

Javanotes 6.0

MBox Few months ago I bought, as a present, an mp3 player for children called hörbert. It is really well made and the sound quality is pretty good. I really suggest as a product. The only problem is that it is quite expensive, so I thought that it would be a nice and easy project for a Christmas present for my daughter. It was already clear since the beginning that the project would be powered by an arduino uno. So I started looking around in order to find a good way to play mp3 files with arduino and I found the Freaduino MP3 Music Shield. Than was the time to choose a mono audio amp (I didn't want to spent time to build one my selfe). The Chinese version is a stereo amp, really cheap, but the sound was really full of noise. The keypad is also a product from Sparkfun. For the battery I chose a 2600mAh power bank, with two usb connectors, one for charging and one for power source. The MBox is supporting SD card FAT 16 or 32. My daughter is really happy and she is using quite a lot.

Objects and Classes Java is an Object-Oriented Language. As a language that has the Object Oriented feature, Java supports the following fundamental concepts: PolymorphismInheritanceEncapsulationAbstractionClassesObjectsInstanceMethodMessage Parsing In this chapter, we will look into the concepts Classes and Objects. Object - Objects have states and behaviors. Objects in Java: Let us now look deep into what are objects. If we consider a dog, then its state is - name, breed, color, and the behavior is - barking, wagging, running If you compare the software object with a real world object, they have very similar characteristics. Software objects also have a state and behavior. So in software development, methods operate on the internal state of an object and the object-to-object communication is done via methods. Classes in Java: A class is a blue print from which individual objects are created. A sample of a class is given below: A class can contain any of the following variable types. Constructors: Example:

How To Become A Hacker Copyright © 2001 Eric S. Raymond As editor of the Jargon File and author of a few other well-known documents of similar nature, I often get email requests from enthusiastic network newbies asking (in effect) "how can I learn to be a wizardly hacker?". Back in 1996 I noticed that there didn't seem to be any other FAQs or web documents that addressed this vital question, so I started this one. If you are reading a snapshot of this document offline, the current version lives at Note: there is a list of Frequently Asked Questions at the end of this document. Numerous translations of this document are available: ArabicBelorussianBulgarianChinese, Czech. The five-dots-in-nine-squares diagram that decorates this document is called a glider. If you find this document valuable, please support me on Patreon or SubscribeStar. The hacker mind-set is not confined to this software-hacker culture. If you want to be a hacker, keep reading. 1. 2. 3. 5. 2. 3.

Java Beginner Tutorial ARDUINO PROJECTS This sketch will readout RF power and SWR from any SWR bridge (for example 'monimatch' type). As this 'monimatch' type of bridge is frequency dependant, the meter must be calibrated for every band. Because my primary interest was for VHF/UHF/SHF, I have foreseen positions for 6m, 4m, 2m, 70 cm, 23cm and 13cm bands - but you can use the ARDUINO readout on HF as well. If you intend to build a HF or VHF bridge yourself, there are several designs available on the web : I recommend to take a look at the information here, here , here and there ! The meter will operate in 3 modes: display instantaneous power forward in Watt en dBm, display SWR display PEP power forward (peak holding with decay) display instantaneous power forward in Watt, display SWR, and emit 'beeps' corresponding to SWR value: low tone beeps at slow rate for low SWR, high tones at fast rate for high SWR. When the band is selected/changed, the display indicated the 'full scale' of power readout. Remarks :

Introduction to Computer Science using Java This is a course in Java programming for beginners. It covers the fundamentals of programming, roughly the same material that is covered in a beginning programming course in a university or in a high school AP Computer Science course. For maximum benefit, go though these notes interactively, thinking about and answering the question at the bottom of each page. There are about 20 pages per chapter. If you spend about 3 minutes per page each chapter will take about 60 minutes, or longer if you copy and run some of the programs. These notes assume that you have the Java version 5.0 or later from Oracle, Inc. at and a text editor such as Notepad. For more about these notes check the frequently asked questions. A German translation of these notes, done by Heinrich Gailer, is available at A French translation of selected chapters is available at

C++ Language Tutorial This website uses cookies. By continuing, you give permission to deploy cookies, as detailed in our privacy policy. ok Search: Not logged in C++ Language These tutorials explain the C++ language from its basics up to the newest features introduced by C++11. Introduction Compilers Basics of C++ Program structure Compound data types Classes Other language features C++ Standard Library Input/Output with files Tutorials C++ LanguageAscii CodesBoolean OperationsNumerical Bases C++ Language Introduction:CompilersBasics of C++:Program structure:Compound data types:Classes:Other language features:Standard library:Input/output with files Make your own smart watch Most IT companies participate in the race to grab people’s wrist. A smart watch becomes the most significant item in a wearable device category. You can easily find this mood in this link, there are tons of smart watches. But here is a simple way to evaluate smart watch’s future on your own. Make it! Retro Watch is an open source project to let you make a smart watch based on Arduino and Android. Release noteUpdated (2015.01.12) : RetroWatch supports u8glib.

Learn Java by Examples RFID Keepsake Box · Mike Buss A few years ago, I wanted to make something special for my girlfriend's birthday. After experimenting with an Arduino, I decided to try to make her a high-tech keepsake box that can lock or unlock with an RFID card. Here is the final result: I had read about the Reverse Geocache Puzzle by Mikal Hart and thought the idea was brilliant. I wanted to do something similar, but with a twist. My girlfriend had mentioned wanting a place to keep small mementos, so I thought a personalized keepsake box would be perfect! Parts Used Design The box is fairly simple: the outside consists of a button and an LED. The inside consists of the Arduino, RFID reader, speaker, power switch, and servo. When the box is closed, a small metal eye hook is fed through a hole in the rim of the box. I wanted the battery to last as long as possible, so the Arduino is only powered when it needs to be. The Pololu switch works extremely well. Planning for Battery Failure The box will be powered by the 9V battery and unlock.

Introduction to Programming in Java: An Interdisciplinary Approach Your Arduino's inbuilt EEPROM Posted on 16 March 2011. Tags: arduino, ATmega1280, atmega168, atmega2560, ATmega328, atmel, binary, bit, byte, DIY, duemilanove, education, eeprom, eleven, freetronics, guide, guides, i2c, learn, lesson, lessons, mega, project, read, storage, tronixstuff, tutorial, tutorials, twentyten, uni, write This is chapter thirty-one of a series originally titled “Getting Started/Moving Forward with Arduino!” by John Boxall – A tutorial on the Arduino universe. The first chapter is here, the complete series is detailed here. [Updated 09/01/2013] Today we are going to examine the internal EEPROM in our Arduino boards. Why would you use the internal EEPROM? What sort of data can be stored? How can a binary number with only the use of two digits represent a larger number? See how each digit of the binary number can represent a base-10 number. Now each digit in that binary number uses one ‘bit’ of memory, and eight bits make a byte. The rest is very simple. The following two tabs change content below.

Arduino pour bien commencer en électronique et en programmation Bienvenue à toutes et à tous pour un tutoriel sur l'électronique et l'informatique ensemble ! Depuis que l’électronique existe, sa croissance est fulgurante et continue encore aujourd’hui. Si bien que faire de l’électronique est devenu accessible à toutes personnes en ayant l’envie. Mais, le manque de cours simples sur le net ou en libraire empêche la satisfaction des futurs électroniciens amateurs ou professionnels et parfois empêche certains génies à se révéler ( ). Ce que nous allons apprendre aujourd'hui est un mélange d'électronique et de programmation. Nous allons, dans un premier temps, voir ce qu'est l'électronique et la programmation. Plan du cours Je vais détailler un peu le plan du cours. Apprentissage des bases Le cours est composé de façon à ce que les bases essentielles soient regroupées dans les premières parties. Après cela, vous aurez acquis toutes les bases nécessaires pour poursuivre la lecture sereinement. Ce n'est pas tout ! Paré pour commencer l'aventure ?