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Thread: RRFusion- My Fusion Brain plugin for RR

  1. #131
    Newbie thwack's Avatar
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    Hey Sonic,

    Recovered from the weekend?? Having any lunk in finding time to have a look at this?

    Thanks
    Thwack
    Car PC -Jetway J7F2WE2G, 4Gb CF Boot, 32Gb CF Data, 1Gb Ram, M2-ATX PS, 8" 800x600 TS, SiLabs USB Radio, Garmin GPS15L, Ublox SBR-LS DR GPS, Fusion Brain, Multibay Card Reader, Panasonic Slotload DVD+-RW, Custom Fab Steel Case
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  2. #132
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    That weekend must have dazed him pretty good, me thinks...
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  3. #133
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    Quote Originally Posted by Blue ZX3 View Post
    That weekend must have dazed him pretty good, me thinks...
    i guess so.. i completely forgot to follow up before now lol

    Quote Originally Posted by thwack View Post
    Hey Sonic,

    Recovered from the weekend?? Having any lunk in finding time to have a look at this?

    Thanks
    Thwack
    i think i have a "small" grasp at what ur trying to do here. Basically u wish for me to create a new analog type "voltage divider" which uses the formula you've posted above to manipulate the data? If so, thats no problem.
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  4. #134
    Newbie thwack's Avatar
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    That's exactly it!!!

    If you create the input type voltage divider, convert the FB input to voltage and then allow a custom input number from the ini to multiply the voltage that would cover all voltage dividers.
    IE:

    In rrfusion.ini
    FBANALOG2TYPE = 6 //Voltage Divider
    FBANALOG2CORRECTION = 0.232

    This way in logic: FB reads 3.42v and then divides by 0.232 so ANALOG2 would read 14.74v (3.42/0.232)
    Car PC -Jetway J7F2WE2G, 4Gb CF Boot, 32Gb CF Data, 1Gb Ram, M2-ATX PS, 8" 800x600 TS, SiLabs USB Radio, Garmin GPS15L, Ublox SBR-LS DR GPS, Fusion Brain, Multibay Card Reader, Panasonic Slotload DVD+-RW, Custom Fab Steel Case
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  5. #135
    FLAC
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    Quote Originally Posted by thwack View Post
    If you create the input type voltage divider, convert the FB input to voltage and then allow a custom input number from the ini to multiply the voltage that would cover [HL]all[/HL] voltage dividers.
    Works great for sensors that output a range of voltages at a constant current, or buffered output.
    But for many sensors, like ones where the resistance of the sensor changes with the parameter being measured, the current will change as the parameter changes, thus changing the measured voltage non-linearly (the changing parameter is in the numerator and denominator of the actual ratio: Vout=Vin(Rvar/(Rvar+Rstatic)). This, unfortunately, is not a case where a simple, static ratio can be applied. But maybe this can be accounted for with just a little more math behind the scenes.
    Not trying to rain on any parades, just stating a precaution, and offering food for thought.

  6. #136
    Newbie thwack's Avatar
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    I stand corrected. h3rk is correct that the situation I propose is not correct in ALL circumstances.

    In the situation I have described, the resistance needs to be static. I had envisioned that this would be used to measure voltages larger than the Fusion Brain can handle natively. ie. a car's system voltage / battery voltage.

    Perhaps the type would need to be a "Static Voltage Divider" and then the variable divider could be covered with the "Custom Equation" type that has also been proposed where the equation is also taken as an input.

    Thanks h3rk for pointing out some circumstance that I had not considered.

    Thwack
    Car PC -Jetway J7F2WE2G, 4Gb CF Boot, 32Gb CF Data, 1Gb Ram, M2-ATX PS, 8" 800x600 TS, SiLabs USB Radio, Garmin GPS15L, Ublox SBR-LS DR GPS, Fusion Brain, Multibay Card Reader, Panasonic Slotload DVD+-RW, Custom Fab Steel Case
    Car- 1988 Nissan Patrol 4WD

  7. #137
    Mo' Programming Mo' Problems
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    Sonicxtacy02's Avatar
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    hey as long as you guys can present me with formulas i can add then to RRF
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  8. #138
    Newbie thwack's Avatar
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    Is there anything special about the formulas? Do we need to have the conversion from raw units to volts in the formula?

    If not can you please add the formula I mentioned for the static voltage divider.


    ANALOG#=Vin/Correction

    Where Vin is FB voltage and correction is defined in ini file.
    Thanks
    Thwack
    Car PC -Jetway J7F2WE2G, 4Gb CF Boot, 32Gb CF Data, 1Gb Ram, M2-ATX PS, 8" 800x600 TS, SiLabs USB Radio, Garmin GPS15L, Ublox SBR-LS DR GPS, Fusion Brain, Multibay Card Reader, Panasonic Slotload DVD+-RW, Custom Fab Steel Case
    Car- 1988 Nissan Patrol 4WD

  9. #139
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    nothing special at all.. the raw number is what all formulas are based on.. and if the converted value has a needed suffix be sure to specify. I will add the formula above on tuesday when i return to work.

    Nevermind .. i dont think it'll matter one way or the other

    File is available post 1. Since i consider this a sub-release, i did not update documentation. However you MUST backup your rrfusion.ini then check out the included .ini for the correction format
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  10. #140
    Newbie thwack's Avatar
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    So the above formula should be:

    ANALOG# = ((ANALOG#RAW*(5/1023))/ANALOG#CORRECTION)


    Where ANALOG# is formatted label
    ANALOG#RAW is FB raw input
    ANALOG#CORRECTION is from ini file
    And the suffix is "V"

    Thanks Sonic,
    looking forward to tuesday
    Thwack
    Car PC -Jetway J7F2WE2G, 4Gb CF Boot, 32Gb CF Data, 1Gb Ram, M2-ATX PS, 8" 800x600 TS, SiLabs USB Radio, Garmin GPS15L, Ublox SBR-LS DR GPS, Fusion Brain, Multibay Card Reader, Panasonic Slotload DVD+-RW, Custom Fab Steel Case
    Car- 1988 Nissan Patrol 4WD

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