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Fuel sender 0-5v help

Discussion in 'Automotive Electronics' started by skuzzle, Apr 11, 2012.

  1. stealthprobe

    stealthprobe New Member

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    I plan on building pretty much the same thing. My fuel level sending unit outputs the same range of resistance. I have one question... will any op amp work? I found a NTE975SM at radio shack...
     
  2. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    Unfortunately no. The specified LM358 will pull its output pin close to ground (required); the NTE unit will not.

    Do you have the required 5V reference voltage you can tap?
     
  3. stealthprobe

    stealthprobe New Member

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    The ecu has a regulated 5v output. There is a Adc circuit on the ecu that accepts 0 - 5v. However i dont need to have it exactly from 0 to 5... i can have it from say... 1.5 to 4 volts and just scale the gauge in the software to match. whats important is that its linear.
     
  4. dave

    Dave New Member

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  5. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    The circuit will more linear than the damn sender.;)
    To make the system ratiometric, it is important that the sender be fed from the regulated voltage...
     

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