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AD592 working? — Parallax Forums

AD592 working?

ArchiverArchiver Posts: 46,084
edited 2003-12-11 10:17 in General Discussion
I am working throught the series of experiments in the Earth
Measurements book and parts kit I bought. I have been enjoying it
very much. I have gotten to the experiment with the AD592 temp.
sensor. This is the first experiment I have not been able to get to
work. I have rechecked my circuit and program a number of times.
Yet, I get an rct value of 0 no matter what. Is there a simple
diagnostic I can do to validate that the AD592 is working? I read a
resistance across it of around 3Mohms. Is this normal?

Thanks for any help.
Mark

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-12-11 07:56
    >I am working throught the series of experiments in the Earth
    >Measurements book and parts kit I bought. I have been enjoying it
    >very much. I have gotten to the experiment with the AD592 temp.
    >sensor. This is the first experiment I have not been able to get to
    >work. I have rechecked my circuit and program a number of times.
    >Yet, I get an rct value of 0 no matter what. Is there a simple
    >diagnostic I can do to validate that the AD592 is working? I read a
    >resistance across it of around 3Mohms. Is this normal?
    >
    >Thanks for any help.
    >Mark


    If you substitute a 100kohm resistor in place of the AD592, you
    should get a reading from the RCTIME command of about 3000 to 4000.


    100k 0.22uF
    +5
    /\/\--;---||
    common x var word
    | capacitor DO
    | RCTIME 0,0,x
    p0
    /\/\--' LOW 0
    100 DEBUG DEC x,cr
    PAUSE 1000
    LOOP

    That should help to determine if the problem is with the sensor or
    with the wiring.

    -- Tracy
  • ArchiverArchiver Posts: 46,084
    edited 2003-12-11 10:17
    Hi Mark,

    The AD592 supplies a current of 1 uA per degree Kelvin.

    So at 20 degree C there should be a current of 293.15 uA. If you have a
    meter with a mA range you will be able to check it.

    The AD592 has a 'plus' and a 'minus' so there could be your problem.

    Succes,

    Klaus

    Oorspronkelijk bericht
    Van: mandsb00 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=LY23wDyXj7wAQCQWrWO3TBOhP_l-oZMYvvUwmnYfL7PmMzty2WJbcYwra_4Yh5QSUZ0dplAuCMP0W2iovsvfZrDP]mandsb@w...[/url
    Verzonden: donderdag 11 december 2003 2:40
    Aan: basicstamps@yahoogroups.com
    Onderwerp: [noparse][[/noparse]basicstamps] AD592 working?


    I am working throught the series of experiments in the Earth
    Measurements book and parts kit I bought. I have been enjoying it
    very much. I have gotten to the experiment with the AD592 temp.
    sensor. This is the first experiment I have not been able to get to
    work. I have rechecked my circuit and program a number of times.
    Yet, I get an rct value of 0 no matter what. Is there a simple
    diagnostic I can do to validate that the AD592 is working? I read a
    resistance across it of around 3Mohms. Is this normal?

    Thanks for any help.
    Mark


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