very nice

Em 18 de abril de 2012 06:06, Patryk <p4tr...@o2.pl> escreveu:

> Hello
> As I previously said I was trying to build USB 1-wire adapter. Today I
> managed to get it working on a breadboard.
> The main advantage is that it's cheap and easy to build from standard
> parts. It uses 1-wire master DS2482-800 which is connected with i2c bus to
> Atmega8 which is a USB to i2c converter.
> Atmega8 is a widely available microcontroller I can even buy it at my
> local electronics shop. It costs there about $2. It has to be programmed
> before use. You can build a cheap programmer that uses parallel port if
> You have
> an old PC.
> First I run i2c-tiny-usb http://www.harbaum.org/till/**
> i2c_tiny_usb/index.shtml<http://www.harbaum.org/till/i2c_tiny_usb/index.shtml>
> but there was a performance issue. The read from DS18B20 took about 3
> seconds
> and without specifying the bus about 10. Compared to 1.5 with DS2480 and
> similiar
> time connected to vga i2c port.
> Fortunately there is a derivative project from Till's i2-usb-tiny. It's
> from project OpenServo.
> It uses Atemga8 and has better performance because it uses some built in
> i2c(do not know exactly)'
> Here's the page with it http://www.openservo.com/**
> viewcvs/OpenServo/Interfaces/**OpenServo_InterFace/?root=cvs<http://www.openservo.com/viewcvs/OpenServo/Interfaces/OpenServo_InterFace/?root=cvs>
> You can also buy it assembled in this shop it has other useful features.
> http://www.robotfuzz.com/**index.php?main_page=product_**
> info&cPath=66&products_id=181<http://www.robotfuzz.com/index.php?main_page=product_info&cPath=66&products_id=181>
>
> That's how it looks like on the breadborad. Atmega on the left then DS2482
> and one DS18b20 on the right.
> http://www.fotosik.pl/pokaz_**obrazek/pelny/**ad26b46b4fb860dd.html<http://www.fotosik.pl/pokaz_obrazek/pelny/ad26b46b4fb860dd.html>
> I also attach a schematic.
> http://www.fotosik.pl/pokaz_**obrazek/pelny/**ab6a5fc5827cd013.html<http://www.fotosik.pl/pokaz_obrazek/pelny/ab6a5fc5827cd013.html>
>
> I'm now designing a board for it.
>
>
>
> --
> p4trykx
>
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>


-- 
Roberto Spadim
Spadim Technology / SPAEmpresarial
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