Arduino LCD Keypad Shield – Clock Application

UPDATED: I removed all delay(); calls because they were not accurate enough, and there was a time drift. Instead, now there is a while(); that waits until the required time has passed.

Recently I found here a really cheap LCD shield with buttons for Arduino.

Today it arrived, and I made a simple clock program to test it out. It’s a little slow when refreshing the screen, but it’s perfect for the price.

A really cool application would be to use it together with a Raspberry Pi to execute simple commands and see a small web server’s status.

Here are some pictures, a video, and the code for the clock application. It is using the LCDKeypad C++ class which can be found here.

Leap Motion – Tell me your ideas

Leap Motion is a company that started with the vision of making the interaction between humans and computers better and more natural. They believe in achieving that using a sensor device that detects your hands.

About half a year ago, I showed my interest as a developer to make applications using their device. As of yesterday, I have received the device, which you can see in the video below.

I want to develop great applications, but I have very few ideas. What kind of applications would you like to see using this technology? Please tell me your ideas in the comment field below.

RFID tag emulation with an AVR

Some time ago, I read this article about using an AVR ATtiny85 microcontroller to emulate an EM4102 RFID tag, and today I thought of giving it a try.

I used an Arduino as an ISP programmer to program the ATtiny85 with this source code. The electronics used:

  • 1x AVR ATtiny85
  • 1x 10uF capacitor
  • 1x 22uF ceramic capacitor
  • 1x Home-made coil from toilet paper cardboard

Here are some pictures and a video from the result:

Box2D Test iOS Application

So I started learning some Box2D to improve my skills in game programming. Box2D is a physics engine written in C++. Many games use a graphics engine but not a physics engine. The graphics engine usually accelerates the GPU graphics, but what makes movements look realistic is the physics engine.

Because Box2D is written in C++, you cannot simply use it in your iOS project, but thanks to Objective-C++ support, you can change your file extensions to .mm and then simply use C++ in your Objective-C project.

In this example, I’m not using a graphics engine, only Box2D and basic UIKit elements (UIView). The next step would be to do a similar example using a graphics engine like Cocos2D.

Source code:

Euro 2012 Greece iPhone App

For the past 2 weeks, I have been making an iPhone application for Greece’s team in the UEFA EURO 2012 championship. Right after the 1-1 against Poland, Apple has now released my application to the public.

I was hoping for them to be a little faster but better late than never. This is version 1.0, and if you are interested in Greece or want a live score application for Euro 2012 in greek, you can download it from here for free:

Download Link

Here are some screenshots of the first version. Version 1.1 will be submitted shortly and will contain more live information about the games and teams.