Dwayne Reid email (remove spam text)
At 01:56 PM 11/9/00 -0500, M. Adam Davis wrote:
>What you've told us so far:
>Two 9 bit numbers, A and B
>A + B is constant, so B is inversely proportional to A.
> There is a constant (A + B)
> This means their relationship is linear,
> Given A, B could be determined (and vice versa)
> (ie, A+B=512, 512-A=B, 512-B=A, etc if 512 is the constant)
I'm getting in trouble here because I'm not speaking precisely enough.
A + B = C
X is not a constant per se - its just that for a given set of components
and ambient temperature, A increases by the same amount that B
decreases. I find C when I've measured both A and B.
>So, your equation
>X = (remainder of) ( (A+B)/B )
>is actually X = B MOD Constant (MOD being the remainder of the division
This is where I'm not speaking precisely enough - I don't have a constant
that I can work with at compile time. I find (a+b) only after I've
measured both a & b during operation.
>So far, as I understand it, you are modeling a three terminal pot
>(terminals 1,2,3, with 2 being the wiper). A represents the resistance
>between 1 & 2, B the resistance between 2 & 3, so A + B is the total
>resistance of the POT, which is constant.
Its the best analogy I could come up with. The application is for
differential sensors, both resistive and capacitive.
As I mentioned in my first message, what I'm looking for is x = (remainder
of) (a+b) / b or, as you more correctly state: x = b MOD (a+b).
My first message said "I have 2 - 9 bit numbers that I need to find the
ratio of, where the ratio is expressed as a number from 00 to FF." I guess
what I failed to express clearly enough was that the ratio was "b" (top
part) and a+b (bottom part). Sorry for being imprecise.
Dwayne Reid <planet.eon.net> dwayner
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
Celebrating 16 years of Engineering Innovation (1984 - 2000)
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