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Author Topic: PIC12F675 based serial voltmeter and ammeter with min and max values  (Read 4897 times)
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kalpakchiev
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« on: March 23, 2011, 10:16:48 10:16 »

PIC12F675 based serial voltmeter and ammeter with min and max values.

Settings in the HEX file are for:
RS232 2400/8/NONE/1/NOT inverted
Measure on 1s interval
Value of the shunt resistor is 1R

Those settings can be changed in attached PBP file.

Best regards Ivan Kalpakchiev
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kalpakchiev
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« Reply #1 on: March 23, 2011, 01:30:50 13:30 »

Hi FriskyFerret, you are right but my intention is to keep the count of the parts in that project as low as possible.

The value of Shunt resistor depends on the range of current that is supposed to be measured and in PBP program there аrе mentioned values from 0.5R up to 10R.

After all the device is supposed to be inexpensive and constructed with what you have around in the parts box  Cheesy.

If we are talking about V an I meter as a precision instrument then yes there are dedicated solutions out there.

Thanks a lot for your comment
Best regards
« Last Edit: March 23, 2011, 03:31:47 15:31 by kalpakchiev » Logged

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kalpakchiev
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« Reply #2 on: March 24, 2011, 12:37:23 00:37 »

Hi FriskyFerret, I do not want to argue with you, but having in mind my previous post I still think that it is better to keep things simple if it is possible.

BUT, in this line of thought, would you mind, if you redesign the schematic proposed by me in your way- adding an OpAmp and moving the shunt R to the positive side and I will change the PBP code if it is necessary.

This way we can show together both ways to complete the same task and every one can choose the best way for his specific purpose.

Best regards and many thanks in advance for your kind cooperation.
Ivan Kalpakchiev
« Last Edit: March 24, 2011, 12:55:51 00:55 by kalpakchiev » Logged

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« Reply #3 on: March 24, 2011, 02:43:51 14:43 »

Topic being watched with intrest, with both with a Technical and a Civil intrest.

so play nice.

Just a note: if you take the sample point imes from a live ciruit, and do the sums, then it becomes part of the design.
« Last Edit: March 24, 2011, 03:39:02 15:39 by pickit2 » Logged

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kalpakchiev
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« Reply #4 on: March 24, 2011, 04:14:30 16:14 »

Just a note: if you take the sample point imes from a live ciruit, and do the sums, then it becomes part of the design.

Sorry, but I am not sure what do yo mean with this one, is it about a part of PBP code?
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« Reply #5 on: March 24, 2011, 09:33:36 21:33 »

 Smiley  Cheesy  Grin  Cool  Hey what about my suggestion?
« Last Edit: March 24, 2011, 09:36:20 21:36 by kalpakchiev » Logged

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« Reply #6 on: March 25, 2011, 11:34:56 23:34 »

number one hallmark of a noob/wannabe.
also a hallmark of a noob/wannabe

Hey!! I am a noob and I refuse to have hallmark!
So go and take your hallmarks elsewhere..

Other than that, you are doing a pretty good job kalpakchiev.
I am glad it is no longer using your hallmark PIC16F84   Cheesy Cheesy Cheesy

and, oh yeah...  bad ferret! go to your corner!
« Last Edit: March 25, 2011, 11:39:09 23:39 by Parmin » Logged

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kalpakchiev
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« Reply #7 on: March 26, 2011, 12:27:26 00:27 »

"I am glad it is no longer using your hallmark PIC16F84"     Grin   Yea But I remember it. It was the STARTER  Cheesy 
« Last Edit: March 26, 2011, 12:53:19 00:53 by kalpakchiev » Logged

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Ichan
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« Reply #8 on: March 27, 2011, 07:43:00 07:43 »

PIC16F785 can be an alternative, it has 2 opamp inside.

I ever had an idea to measure / test a power supply with this one as picture attached, workable?

-ichan
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« Reply #9 on: March 28, 2011, 03:43:10 03:43 »

if you want substitutes there are plenty PIC that could be used.
from PIC10 to PIC32.
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« Reply #10 on: March 28, 2011, 04:44:33 04:44 »

if you want substitutes there are plenty PIC that could be used.
from PIC10 to PIC32.


But only one with internal Op-Amp, the R Shunt can be 100x smaller.

-ichan
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