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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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0-and-1
0 and 1 communicating

In a world of 0 and 1 bits the necessity to create a convention for communications rises up immediately.
They are the logical minimum set to create information (and the best one, as having been demonstrated), through possible variations between them. In absolute they're pure data.

Is it enough? certainly it isn't; we need at least a convention thanks to which creating an amount of interchangeable informations.

By basing on these last ones, we create again other more abstract new informations, and so on.

We're trying to summarize in few words a process that took many decades of years to assume a definitive common physiognomy, in the effort to bring computer science closer to human vision and vice versa: in a way you don't have to worry about what is happening under the hood... if you don't want!
But if you did? ...continue reading "Strange Types Circulating (in code)"

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UML Intoduction

In previous article about Lazarus IDE and Free Pascal compiler we began an important talk on how programming could be easy (thanks to other people's job).
Here is important to mention how a blind programming generally brings into a software with a short life-cycle, where not directly into failure.

As we like to remember on our site, theory and practice can travel together.
Software isn't an exception.

...continue reading "BOUML. Model your software"

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The lazarus project

Even if you're far away from  programming any kind of software, you could be surprised by how beginning is simple.
Yes. Simple!
Programming is commonly intended like a sort of magic, where a strange magician press buttons on keyboard, creating wonderful mysteries.
Where possible, let's start destroying this myth!

Using a metaphor, programming is cooking.
You just have written a or have a written recipe: reading it you can imagine where it brings you, but making it is better, maybe discovering that you like it as it is, you don't like at all and start to improve it, you don't like at all and start to worsen it.

...continue reading "Lazarus! Get up, pick your pc up, and program!"

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Liquid Filler 3D

We have already seen till now how we have constructed our project in PCB .
Liquid filler at this point needs calibration.
In this article we will discuss the calibration method.
The first step is to dimension correctly the RG resistor.
From the weight sensors article we already know that :
a) For a 1Kg load cell we are going to need Gain=1,07421875/0,005473=196 for a 1.1V arduino reference analogReference(INTERNAL); So we need a Rg=312 Ohm.

b) For a 20Kg load cell we need a Gain =  3925 for a 1.1V arduino reference analogReference(INTERNAL);
So we need a Rg=15 Ohm.

...continue reading "Liquid Filling Machine – Liquid Filler Part 4"

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