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Offline levettpTopic starter
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« Reply #30 on: March 30, 2011, 01:54:18 am »
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Hi Wus47

I currently log data from the PIC to a small computer (

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http://www.fit-pc.com/web/
) over COM port. Then I process data with Delphi. But problem with this is slow speed that Delphi has to process the data string. So I don't think that PC based processing will be very effective in practice.

Regards

Levett

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Offline wus47
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« Reply #31 on: March 30, 2011, 08:31:34 am »
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Good day Levettp!
Thank You for reply.
In previous letter you wrote about PIC. What means 80 Mps?
Using the microprocessor you can not make complex(difficult) calculations and to make to the good user interface.
It is possible to write a part of the program in codes (assembler)..
 But it is necessary to try practically. You too program on Delphi?

While
Wus47


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Offline levettpTopic starter
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« Reply #32 on: March 30, 2011, 10:56:48 am »
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Quote:Posted by wus47
Good day Levettp!
Thank You for reply.
In previous letter you wrote about PIC. What means 80 Mps?
Using the microprocessor you can not make complex(difficult) calculations and to make to the good user interface.
It is possible to write a part of the program in codes (assembler)..
 But it is necessary to try practically. You too program on Delphi?

While
Wus47



MIPS = million instructions per second

You are correct to say that it is more complex to program a PIC compared to PC. But processing speed is much faster. I use a dsPIC ... it is a PIC specifically for digital signal processing.

Yes you can start anywhere in the PIC code with assembler. I have done this before for very quick CRC error checking but for normal code like in MD, the standard C code compiles very good (just make sure you have a good compiler).

I wrote my MD analysis tool in Delphi. But the PIC must wait 250ms between sending the data to the PC else the Delphi program overflows. This is a big problem for practical use of a PC as MD controller.

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Offline wus47
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« Reply #33 on: March 30, 2011, 11:46:07 pm »
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Hi Lepettp or good morning!
You wrote:   
 ......I understand that the size of gold has influence. I will get a size of gold and size of iron that at the same distance from coil, gives the same difference in integral of signal. Then see if there is difference in dU/dT of graph.....

It should not be. Even insignificant difference in the sums should be.
Check up number of bits. If it is equal 8 bits then too low resolution on amplitude.
Should be 16 or 24 bits (amplitude resolution is 1/16384 for 16 bits and 255/16384 for 24 bits).
Besides check up the sample rate, main delay and width pulse. Probably your program can not synchronize with beginning of a pulse. Or these parameters are established at the end of a pulse.
Mine program (placed on a forum) use parameters of my sound card (Realtek AC97 Audio, 48000 for 16 bit and 96000 for 8 bits) . It is enough for this purpose that you wrote (small pieces of gold and iron).
It is necessary to change parameters. Earlier I wrote, that you should inform me parameters of your sound card and I shall do necessary changes in my program.
Tell me full name your PIC. I want see parameters this PIC with datascheet please

Best wishes
Wus47

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Offline levettpTopic starter
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« Reply #34 on: March 30, 2011, 11:55:26 pm »
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Quote:Posted by wus47
Hi Lepettp or good morning!
You wrote:   
 ......I understand that the size of gold has influence. I will get a size of gold and size of iron that at the same distance from coil, gives the same difference in integral of signal. Then see if there is difference in dU/dT of graph.....

It should not be. Even insignificant difference in the sums should be.
Check up number of bits. If it is equal 8 bits then too low resolution on amplitude.
Should be 16 or 24 bits (amplitude resolution is 1/16384 for 16 bits and 255/16384 for 24 bits).
Besides check up the sample rate, main delay and width pulse. Probably your program can not synchronize with beginning of a pulse. Or these parameters are established at the end of a pulse.
Mine program (placed on a forum) use parameters of my sound card (Realtek AC97 Audio, 48000 for 16 bit and 96000 for 8 bits) . It is enough for this purpose that you wrote (small pieces of gold and iron).
It is necessary to change parameters. Earlier I wrote, that you should inform me parameters of your sound card and I shall do necessary changes in my program.
Tell me full name your PIC. I want see parameters this PIC with datascheet please

Best wishes
Wus47


Good morning Wus47

It is dsPIC30F2020

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