Hi,

I have checked the data using the regression analysis technique, and the
connection is LINEAR. The estimated formula is:

PSI = -17.20598 + Volts * 15.12302

Any better pocket calculator would do also this fit. However, to check
whether the connection is really linear, is a bit (not very) harder.

I hope this helps you.

Regards,
Imre


On Thu, 8 Oct 1998, Joao Batista wrote:

> Would anybody have how to help me to solve a problem, although simple,
> but not for a less experienced user?
>
> I am using a sensor of pressure and an operational one that supplies me
> the following values:
>
>
> PSI      Volts
>
> 0          1,183
> 5          1,440
> 10        1,773
> 15        2,092
> 20        2,471
> 25        2,823
> 30        3,150
> 35        3,460
> 40        3,750
>
> When using a test routine multiplying the value of ADRES (PIC16C74A) for
> 16 and the routine bin_bcd I get to obtain a reading in display of 40,80
> when in full scale (255).
>
> But as there is not linear of the circuit in subject, I don't get to
> maintain a proportional value in the display to input of  PIC.
>
> How make a table that maintains the proportion?
>
> Does a formula exist for this problem?
>
> If somebody possesses an answer, I would thank if  could send me.
>
> Thank you
>
> Joco Batista - Jq96@claret.com.br / jq96@netsite.com.br
>
>