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Optical encoders and the bTop

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  • gooberplasty2003
    I m curious about the optical encoders on the robot s motors / wheels. How were they monitored with the bTop? I d be inclined to attach one phase to an
    Message 1 of 2 , Oct 13, 2005
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      I'm curious about the optical encoders on the robot's motors / wheels. How were they
      monitored with the bTop? I'd be inclined to attach one phase to an interrupt and the other
      phase to a data line, then increment or decrement an internal counter with each interrupt,
      depending on the state of the data line. Is this how it's done? I'm aware of some HP parts that
      provide this function but I'm not sure if their still available.

      Ward
    • keencoyote
      In the case of the bTop robot the encoders are only used to monitor speed. I am using home made encoders, I printed a pattern with black markings radiating
      Message 2 of 2 , Oct 13, 2005
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        In the case of the bTop robot the encoders are only used to monitor speed.

        I am using home made encoders, I printed a pattern with black markings radiating from
        the central hub onto a transparency, laminated it so the printed surface would not have
        excessive ware and glued it onto a shaft collar (cutting it out after it was glued).

        I then used a light interrupter to detect the markings.

        A commercial unit might have worked better, however I was short of time and physical
        space as to where I could mount it.

        As to the electronics I then run the pulses into a National Semiconductor Frequency to
        Voltage converter which in turn feeds my motors PWM.

        --- In bTop_Robot@yahoogroups.com, "gooberplasty2003" <ward_sacrificial@s...> wrote:
        >
        > I'm curious about the optical encoders on the robot's motors / wheels. How were they
        > monitored with the bTop? I'd be inclined to attach one phase to an interrupt and the
        other
        > phase to a data line, then increment or decrement an internal counter with each
        interrupt,
        > depending on the state of the data line. Is this how it's done? I'm aware of some HP
        parts
        > that provide this function but I'm not sure if their still available.
        >
        > Ward
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