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  1. #1
    767 builder edo17982's Avatar
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    Airspeed indicator interfaced with OC cards

    Hello guys I post here a link to my youtube channel where I'm posting videos of gauges conversion as i complete them.
    Any comment / question / suggestion will be appreciated.
    Hope you'll enjoy!!

    http://www.youtube.com/user/Edoradar


    Edoardo

  2. #2
    500+ This must be a daytime job
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    Re: Airspeed indicator interfaced with OC cards

    Edoardo

    Excellent work and very impressive, especially with DC motors rather than servos

    Well done

    David

  3. #3
    500+ This must be a daytime job 737NUT's Avatar
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    Re: Airspeed indicator interfaced with OC cards

    Quote Originally Posted by fordgt40 View Post
    Edoardo

    Excellent work and very impressive, especially with DC motors rather than servos

    Well done

    David
    He is using a dc motor with a feedback pot, same as a servo. None the less, nice job

  4. #4
    300+ Forum Addict Anderson/SBSP's Avatar
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    Re: Airspeed indicator interfaced with OC cards

    Bravissimo!!!
    Anderson Roberto de Souza - Brazil / São Paulo
    Blog: www.737ngsim.com.br Twitter: @ARSouza

  5. #5
    767 builder edo17982's Avatar
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    Re: Airspeed indicator interfaced with OC cards

    Quote Originally Posted by 737NUT View Post
    He is using a dc motor with a feedback pot, same as a servo. None the less, nice job
    Yup you're right, the good is that I was able to use the existing DC motors inside replacing resolvers with pots with some mod to the housing.
    The bad is that OC don't use a PIC with higher resolution a/d and that is a limitation to smoothness and a big limit in those devices that have lot of turns like altimeter... any idea on how to pass over that?

  6. #6
    500+ This must be a daytime job 737NUT's Avatar
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    Re: Airspeed indicator interfaced with OC cards

    Use a multi-turn pot and gearing, one turn = 5K or 10K feet just a thought

  7. #7
    767 builder edo17982's Avatar
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    Re: Airspeed indicator interfaced with OC cards

    Already thought abput that but the result wth 256 steps only (8 bits) is that on, let's say, 60K feet range each step would be 60000/256 = 234 ft which is not possible... a thought was to use 2 pots...one rotate each 2000 ft and one make a rotation within the full range which work as a sort of counter...I need to elaborate a sioc script for that but could be a solution. the only bad is that a continuous rotation pot has a dead angle of more or less 20°....

  8. #8
    500+ This must be a daytime job 737NUT's Avatar
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    Re: Airspeed indicator interfaced with OC cards

    Well most planes dont fly above 40K feet so that could help on the resolution. Also the servo is 10bit so that may help also.

  9. #9
    767 builder edo17982's Avatar
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    Re: Airspeed indicator interfaced with OC cards

    Yup you're right.. i'll post it once I'll find the most suitable solution

  10. #10
    500+ This must be a daytime job
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    Re: Airspeed indicator interfaced with OC cards

    Quote Originally Posted by 737NUT View Post
    He is using a dc motor with a feedback pot, same as a servo. None the less, nice job
    From his Youtube text it was not apparent that he had actually cannabalised existing servos. Also, as you are aware the programming of "raw" dc motors with separate feedback is much more complicated in SIOC than using servos - hence my comment

    David

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