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Thread: 4 Channel Input Isolator and Voltage Divider

  1. #21
    Fusion Brain Creator 2k1Toaster's Avatar
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    You can see the range is sort of centred on the jumper settings, and you just move that curve around based on the resistor values. Like the 3.3v versions had the center of the linear portion centred around 3.3v which gave good accuracy around the part of interest.
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  2. #22
    FLAC
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    Alright, the fbd daemon reads in the 0-5 volt analog input as 0-5 volts.
    I want to be able to see the actual voltage.

    So as I understand it y is what the fusion brain is reading on the analog input and in order to get the actual voltage, I need to solve that equation for x?

    Any chance you've already solved that baby for x, I'm at work so I don't have a graphing calculator handy?
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  3. #23
    Fusion Brain Creator 2k1Toaster's Avatar
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    Correct.

    I think it is easier to visualize what is going on with the previous graph. For the equation to use in MDX, you would use this:

    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

  4. #24
    Fusion Brain Creator 2k1Toaster's Avatar
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    y = -9E-06x4 + 0.001x3 - 0.071x2 + 1.595x - 2.042

    y = Input Voltage
    x = What the FB reads in
    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

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