Help with pressure sensor.

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  1. - 19th April 2009, 10:12 #1
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    Acetronics2
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    Wink simple maths

    Quote Originally Posted by DavyJones View Post
    woohoo I think I got it. Were X is my value read from the AD. I get a nice looking number. What do you think?

    x = x - 24
    res = x * 7812
    res = div32 1000
    Hi, Davy

    I think you could have got it better !!!

    .78125 = ... exactly 25/32 !!!

    so, res = ( x * 25 ) >> 5


    Alain
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  2. - 19th April 2009, 19:06 #2
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    What if I switched the VRef+ and Vref- to

    Vref+ = 0v
    Vref- = 5v

    Would that work?
  3. - 20th April 2009, 05:04 #3
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    Quote Originally Posted by erice1984 View Post
    What if I switched the VRef+ and Vref- to

    Vref+ = 0v
    Vref- = 5v

    Would that work?
    Not sure.
    From what I found out about that sensor it has a variable resistance output. So to use it with an ADC I think you are going to need to change it to a variable voltage with a voltage divider.
    Dave
    Always wear safety glasses while programming.
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