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You are here: Home / Topics / Problem of Celsius and Fahrenheit scale digital thermometer using 8051 microcontroller (AT89C51)

Problem of Celsius and Fahrenheit scale digital thermometer using 8051 microcontroller (AT89C51)

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Projects › Projects › Problem of Celsius and Fahrenheit scale digital thermometer using 8051 microcontroller (AT89C51)

  • This topic has 3 replies, 2 voices, and was last updated 12 years, 12 months ago by AJISH ALFRED.
Viewing 4 posts - 1 through 4 (of 4 total)
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    Posts
  • May 17, 2012 at 3:18 pm #1806
    Kin
    Participant

    Hello, i got a problem of this project

     

    i made a PCB and sold all the component needed on it

     

    but the temp was remain at 12 degree celsius?

    circuit is the same

    code is same

    component is same

    all components work fine

     

    hope to see how fix this problem..

    thankyou very much~

    May 17, 2012 at 5:34 pm #7847
    AJISH ALFRED
    Participant

     

    Hi Kin,

                   Please check whether your ADC reference pin is getting the required 5V or not.

    May 17, 2012 at 5:44 pm #7849
    Kin
    Participant

    Hello

     

            My teacher taught us to get 2.5V to the 0804 pin9 (verf/2)

    is there any go wrong here ?

    May 19, 2012 at 6:15 pm #7857
    AJISH ALFRED
    Participant

     

    Your teacher is right ! The internal gain of pin 9 of 0804 is 2. But somewhere in the datasheet I found that “voltage below 2.5 can be applied to pin 9″.

    To get a reference voltage of exact 5V, all you have to do is to leave the pin 9 unconnected.

    Sample circuits found in the datasheet also do it this way!

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