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'[PIC]:School DAQ project'
2000\05\31@213241 by David and Melanie

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Hi,
   My name is David and I am going to a technical college in Victoria BC Canada.  In my data acquisition course we are setting up a small strain gauge scale feeding a ADC.  We will be using an f84.  I was wondering if anybody had any suggestions as how to go about processing the information being read in serailly from the ADC.  I was just going to take a series of readings and average them, but our instructor encourages us to use the internet for information.  I have been monitoring the list for a month now, but haven't seen much for this area.

   Thank you for your time.

David Gates


'[PIC]:School DAQ project'
2000\06\01@003657 by Chris Eddy
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David;

Although your question is somewhat broad (you will get better answers if you are specific) you can find a good quantity of very accurate info on digital filters in the last month of posts.  I would look at piclist.com or piclist.org and search the archives.  If you run into specific problems with an approach, someone will probably leap at the oportunity to beat the gremlins out of it then.

Chris Eddy

David and Melanie wrote:

> Hi,
>     My name is David and I am going to a technical college in Victoria BC Canada.  In my data acquisition course we are setting up a small strain gauge scale feeding a ADC.  We will be using an f84.  I was wondering if anybody had any suggestions as how to go about processing the information being read in serailly from the ADC.  I was just

2000\06\01@023803 by Gennette, Bruce

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When you say 'scale' do you mean like a science laboratory balance or like
an old speedometer needle in a car moving across some numbers ?

If it is a balance then you should be able to remotely switch on/off, tare
and take readings.  You should be able to select between take the current
reading, wait for *SOME* stability, wait for total stability, or take the
average over a range of time periods.  Your display *MUST* give user
feedback when any of the above are changed and must also acknowledge unit
changes and accuracy changes.  A common addition is the ability to 'batch
count' - e.g. you put 1 coin on, then 5, then 10, then an unknown amount and
the balance tells you how many coins (or whatever you are counting) are on
it until you change modes.
To be *REALLY* clever you can add a routine to re-calibrate the scale - e.g.
when you start the re-calibration routine the display request a series of
masses to measure; after weighing the series of (6 or 8) masses any
non-linearity is compensated for in a lookup table stored into EEPROM.

Is this enough ?

       {Original Message removed}

2000\06\01@132103 by Matt Bonner

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David and Melanie wrote:

> My name is David and I am going to a technical college in
> Victoria BC Canada.

Hi David,  Chris gave you a good starting point.  Which
college in Victoria - Camosun College?  I taught the
embedded systems course (once) there a few years ago and
convinced the powers-that-be to move from Intel to PIC.  Say
Hi to Don Evans and Les Papp for me (if those old fogies are
still there).

--Matt

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