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Car thermometer

Discussion in 'Electronic Basics' started by Apofot, Sep 1, 2003.

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  1. Apofot

    Apofot Guest

    I have connected one indoor-outdoor thermometer to my car (outdoor
    sensor located behind the front bumper)

    Temperature shown is inaccurate when the car is parked especially the
    hot sunny days. When the car starts going the temperature gradually
    falls but almost never reaches the real ambient temperature. It is
    average 3-4C more than the real.

    Can I solve this problem by a resistor and if yes where? I mean do I
    have to connect it to the one of the two cables that go from the
    sensor to the LCD?

    Sorry for these stupid questions but I am a beginner...

    Thanks in advance.
  2. The temperature sensor is probably doing exactly what it is intended
    to do - it reports the temperature of the air it finds itself in.
    (Lousy english, but it is the best I can do :) )

    What is the temperature _inside_ the car on a hot sunny day? It will
    be well above ambient (weather service reported) temperature. The
    temperature behind the bumper (especially if the sun is hitting the
    bumper) will likewise be higher than ambient.

    When the car is moving, the temperature sensor will be cooled a bit by
    the moving air, but will also be warmed by the heat radiated from the
    road surface - so will still read warmer than ambient.
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