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LM34 in 4-20 mA configuration? — Parallax Forums

LM34 in 4-20 mA configuration?

m_fabio2m_fabio2 Posts: 49
edited 2005-04-30 22:04 in General Discussion
Has anyone ever tried using the LM34 temperature sensor in the 4-20ma output configuration ?


I'm trying and have no luck latetly.
Just wondering if its me.


Post Edited By Moderator (Jon Williams) : 4/29/2005 12:32:06 PM GMT

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-04-29 14:05
    Hello,

    ·· I've never used this configuration before.· The datasheets lists an example circuit for it.· Are you using the components listed?· Including tolerances of the parts that require them?· What is happening with your circuit?

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • m_fabio2m_fabio2 Posts: 49
    edited 2005-04-30 20:55
    I'm using stock components, but having results sometimes good, sometimes bad.

    For example most the time I get nothing out of the circuit other times I get 139 ma, which tells me something isn't wired right.

    I was just wondering if I have forgot to use a bread board or not.
    Or if anyone else had problems.
  • steve_bsteve_b Posts: 1,563
    edited 2005-04-30 22:04
    if you forgot to use a breadboard?? how are you wiring everything?
    If things are intermittant...check connections first!

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    ·

    Steve
    http://ca.geocities.com/steve.brady@rogers.com/index.html
    "Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
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