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Author: tasos

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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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Circular Menus Redux

Seems like the old circular menu class is now incompatible with the new Arduino 1.0 GUI version.
Rober Wagner from the arduino forum described the incompatibility. He also sent to us an email and we thank him for the contribution.
The circular menu seems to interest a lot of people so we decided to "port" the circular menu class into the new Arduino 1.0 GUI.
We will try to describe the class in the future.
Now before starting have a look at the documentation of the "old circular menu".
As always you have to construct the three button configuration on your breadboard.
The down button is on digital port 7 the right button on digital port 6 and the enter button at digital port 5.
In order to find out how to connect buttons on your arduino please read the "arduino and memory how to" tutorial.

...continue reading "Circular menu in arduino redux"

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Atten-APS-1502D
Atten TPR 3003T

Time ago i bought the ATTEN TPR 3003T regulated power supply.
That device had constant voltage and constant current mode.
Offered voltage and current tuning by using two potentiometers a coarse one and a fine tune one.
It was a 30V / 3A general purpose power supply.
Recently i came across with Atten-APS-1502D. It was a voltage power supply (15V/2A) at a very attractive price.
I didn't spent further time and i bought that one too since i was a happy customer 🙂 .
When it arrived i noticed that the voltage selection would be really hard to set since it didn't offered a pair of coarse/fine tune potentiometers like the 3003T but only a global potentiometer.

I must admit that i didn't knew about that when i was buying it.
When i tested it, my thoughts become reality, since the voltage selection was way too hard to set.
The potentiometer was not only single turn but really small that make things even harder.
That was it ! I had bought the classic old school power supply without even knowing it !  🙁
Here is some ideas of how to fix this fine tune problem...

...continue reading "Add fine tunning on a cheap voltage regulated DC power supply"

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