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Configuring Router on a Stick. Cisco iOS.
Solution called Router-On-A-Stick is commonly used to enable communication between different VLANs. This article presents configuration quickie for this issue. At first we must configure a trunk on a...
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Symbolicating crash log using the console. Xcode 4.
I found that Xcode 4.0 does not symbolicate crash logs as it should. After receiving crash logs from beta tester I dragged .crash file into the Organizer, which normally resulted in crash log being...
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A simple thermometer model in PSpice.
Two resistors and a voltage source – that is all we need to create a very simple thermometer model. Figure below shows the idea. R1 is an ideal resistor model. R2 resistance value changes with...
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Starting a method in a new thread causes memory leak. Objective-C.
When we start a method in a new thread we may easily cause a memory leak. Methods that allow for starting a new thread are: [self performSelectorInBackground:@selector(customMethod:) withObject:nil];...
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Reliability and failure recovery for Border Gateway Protocol (BGP)
Border Gateway Protocol (BGP) became a world-wide standard for inter-domain routing between various autonomous systems (AS). As a result, communication over the global Internet is significantly...
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Noughts and Crosses. Complete iPhone project. Objective-C.
Noughts and Crosses iPhone App Everybody knows what Tic Tac Toe or Noughts and Crosses game is. Everyone has played it. It is simple, trivial or someone may even say stupid. Whateverm I made a full,...
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UIImage Sprite Additions. Objective-C.
UIImage Sprite Additions I wrote an useful UIImage category for handling sprite sheets. The add-on smoothes the way of extracting images from a sprite sheet (or texture atlas). This can be useful in...
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Obstacle detection using MC68HC908AB32.
What the heck is MC68HC908AB32? The MC68HC908AB32 is a member of the low-cost, high-performance M68HC08 Family of 8-bit microcontroller units (MCUs) designed by Motorola with embedded EEPROM for user...
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Model-View-Controller design pattern in iOS development.
Model-view-controller concept. The solid line represents a direct association, the dashed an indirect association (via an observer for example). Source: Wikipedia. In object-oriented programming,...
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Memento and Proxy design patterns in iOS.
In the last article I wrote about Model-View-Controller design patterns that is present in almost every iOS application. This time I will try to reveal some secrets of two other design patterns –...
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Playing with vibrator in Android.
This article covers all the information you should know about using Android device’s vibrator. It describes what is possible to achieve in terms of vibration using Android API. After you read it, you...
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Getting Twitter followers list using Social framework in iOS.
This article presents a useful code snippets for interacting with Twitter’s Friends & Followers REST APIs, which provide simple interfaces for most Twitter functionality. It shows how to implement...
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Detecting UILabel’s text change.
Key-value observing is a mechanism that enables an object to be notified directly when a property of another object changes. However, in general KVO does not work with UIKit classes. Basically, in most...
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Raspberry Pi status LEDs.
Raspberry Pi boards have 2 or 5 Light Emitting Diodes (LEDs). The LEDs indicate status of the operations such as accessing the SD Card or network activity. All of the diodes are located next to the...
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Dynamic linking in Java.
This article explains all you need to know to understand how dynamic linking in Java works. Dynamic linking in Java Java applications are typically compiled to bytecode that can run on any Java Virtual...
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Introducing NSLayoutConstraint Extensions.
NSLayoutConstraint Extensions is a useful category on NSLayoutConstraint containing a set of helper methods for creating most commonly used constraints. The category also includes a debugging extension...
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Changing audio port on Raspberry Pi to 3.5” mini jack.
Raspberry Pi uses its HDMI port as a default port for audio output. This article explains changing audio port on Raspberry Pi to 3.5” mini jack in a couple of simple steps. Changing audio port We will...
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Sharing Internet connection with Raspberry Pi.
This article shows how to share the Internet connection on your Mac with Raspberry Pi. The Pi is connected to Mac using an Ethernet cable. It also shows how to get the IP address of the Pi once the...
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Installing and configuring bluetooth dongle with Raspberry Pi.
This article explains in simple steps the process of configuring bluetooth dongle with Raspberry Pi. Update the list of available packages. sudo apt-get update Install new versions of the packages....
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DHCP in OS X Server.
This article explains configuring DHCP in OS X Server in simple steps. It’s an easy to follow tutorial with screenshots and hints that will help you in starting a DHCP service in your network. DHCP in...
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