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  1. #1
    Join Date
    Sep 2005
    Location
    France
    Posts
    50

    Default how to calculate reverse value with scale

    Hi,

    I cannot find how to convert my level value from receiver (from -130dBm to -30dBm) I do not use minus -> so 130 to 30
    My display (nextion type) has a "vu meter" witch needs 0 to 100
    When my receiver value is 130, I need to send 0 to LCD
    When my receiver value is 30 then I need to send 100 to LCD

    Regards

  2. #2
    Join Date
    Nov 2005
    Location
    Bombay, India
    Posts
    859

    Default Re: how to calculate reverse value with scale

    output = (reading+130)*10/16
    should do it. Where I assume you are reading -130 to +30.

    Thus, a reading of -130 will give output = 0
    and a reading of +30 will give output = 100

  3. #3
    Join Date
    May 2013
    Location
    australia
    Posts
    1,388

    Default Re: how to calculate reverse value with scale

    or

    output = 130-reading
    should do it. Where I assume you are reading 130 to 30.

    Thus, a reading of 130 will give output = 0
    and a reading of 30 will give output = 100
    This is more entertaining than Free to Air TV

  4. #4
    Join Date
    Sep 2005
    Location
    France
    Posts
    50

    Default Re: how to calculate reverse value with scale

    Ohhh yes yes ! I'm so tired... didn't saw as simple as it is !
    Regards

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