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AHA Project RFID Part 2

In this tutorial we will see how we can recognize persons using our RFID reader.
Two LEDs will be added at the project in order to get some better user experience.
A "security line" will be also added. The concept of the "security line" is pretty simple.
If the line get's 5V (is HIGH) then arduino knows that the RFID reader is working correctly otherwise the RFID reader is broken (or the communication between arduino - RFID reader).
As always we will make an "object based" approach.
From the first article of RFID we can find the TAG IDs.
...continue reading "Connecting 125Khz RFID module to arduino – Part 2"

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Published on 1 Comment on UNI-T UT61E data logging programs
Connecting UT61E with the PC

UT61E multimeter has data logging capabilities. Comes with a nice RS323 serial cable.
I have used a Prolific serial to USB cable under Windows 7 in order to connect it with my computer as you can see in the picture.
Normally the latest drivers can be found online.
The official page for this meter is located here.
Clearly from there we can download the data logger software version 2.0 only for Windows.
The version offered from the official web site is buggy but later in this article we can see how we can overcome this problem.
To a huge surprise to me i discovered that the bundled CD of the multimeter has a more updated version of the data logger! It comes with the version 4.01 .
...continue reading "UNI-T UT61E data logging programs"

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Connecting arduino with an external programmer

In this quick tutorial we will see how to program our arduino board with the help of an external programmer and not by using the arduino bootloader.
Before proceeding with this tutorial take a look at the "burn arduino with usb tiny" tutorial.
The first thing you have to understand is that by uploading a program with an external programmer you are going to lose your already burned bootloader on your ATMEGA chip.
So before proceeding make sure you can bootload your chips using your external programmer.

...continue reading "Programming arduino with an external programmer"

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A-H-A-Project-RFID

In this tutorial we will see how we can connect a RDIF reader into arduino.
We are going to use a 125 Khz RFID module  that can be bought from seeedstudio.
Some 125 Khz tags are also needed. We bought them from ebay but you can also find them on other online shops.
This guide is the first of a series of articles.
Starting from this article we are going to construct from scratch a home alarm based on arduino duemillanove.
Since the project is big we are not going to see a lot of details of each part / sensor.
In the future we will try to cover the theoretical gap.
These series of tutorials will be easy to understand and will help you to construct step by step the "A-H-A" (Arduino Home Alarm) project.

...continue reading "Connecting 125Khz RFID module to arduino – Part 1"

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Generics-GUI
Generics - GUI

When you face the matter of writing duplicated code, an idea generally rises about how to not waste time.

In strongly typed coding languages a simple mechanism exists, aiding the coder to solve the problem.
The so called Template.

They are designed so that classes and functions able to work with generic types, giving them the possibility to operate on different data types without the need of rewriting code for each of them.

Maybe you've just thought about the concept key: the abstraction.
Indeed we're dealing with it in the sense described above: a template is a try to avoid useless repeating code writing, and to do this we're forced to find a more general way than the direct and boring one.

...continue reading "Generics and templates"

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