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From: lives on 27 Nov 2008 11:00
Hi, I want to desing a datalogger.I'm measuring humidity,temperature and
pressure. I'm using SHT11 for humidity and temperature. But I haven't a
pressure sensor so instead of it I'm using a potentiometer.
I'm using CCS compiler.I'm coding at Pic c.I'm looking MPX4115 for
pressure transfer formula. Can someone help me for coding that?It's not
important to be MPX4115.I can use different datasheet. I only want to
measure pressure.


From: Jujitsu Lizard on 27 Nov 2008 11:29
"lives" <sevilcaluk(a)gmail.com> wrote in message
news:WLudnZlD_smIWbPUnZ2dnUVZ_trinZ2d(a)giganews.com...
> Hi, I want to desing a datalogger.I'm measuring humidity,temperature and
> pressure. I'm using SHT11 for humidity and temperature. But I haven't a
> pressure sensor so instead of it I'm using a potentiometer.
> I'm using CCS compiler.I'm coding at Pic c.I'm looking MPX4115 for
> pressure transfer formula. Can someone help me for coding that?It's not
> important to be MPX4115.I can use different datasheet. I only want to
> measure pressure.

This page gives a little information:

http://www.phanderson.com/picaxe/spi.html

You'd have to be more specific about the place where you're stumbling.
There is just so much to say ... everything from SPI to computer arithmetic
.... I don't want to do that much typing ... you have to indicate where
you're hung up.

And when is your project due? For what class? Can we get academic credit
for helping?

The Lizard

From: Gary Peek on 27 Nov 2008 14:06
lives wrote:
> Hi, I want to desing a datalogger.I'm measuring humidity,temperature and
> pressure. I'm using SHT11 for humidity and temperature. But I haven't a
> pressure sensor so instead of it I'm using a potentiometer.
> I'm using CCS compiler.I'm coding at Pic c.I'm looking MPX4115 for
> pressure transfer formula. Can someone help me for coding that?It's not
> important to be MPX4115.I can use different datasheet. I only want to
> measure pressure.
>
>
The MPX4115A (A is for "absolute" pressure) is a reasonable choice,
and the formula for converting the output voltage of the device
into absolute atmospheric pressure is right there in the data sheet.
Look for "Nominal Transfer Value", page 4.
From: Cesar Rabak on 27 Nov 2008 14:49
Jujitsu Lizard escreveu:
[snipped]

> And when is your project due? For what class? Can we get academic
> credit for helping?

I think the present quote is around .019999 CEU if the OP doesn't flunk
in the presentation of the term project.
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