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Very low friction potentiometer or encoder

tobbera

Hi!

 

Hope you can help me. I'm going to build a wind vane that senses wind direction. For this I need a rotary position sensor such as a potentiometer or encoder. Its going to be connected to and Arduino Uno

 

                  *360 degrees rotation without stop.

    • *Very low friction (free spinning)
    • *Resolution of at least 360 per revolution.
    • *Dead band of  up to 45 degrees is OK
    • *Ruggedness and durability is not of great concern, this is for an experiment.
    • *Bellow USD $50

 

I have looked at several online, but found many to be very expensive. I have bought a BOURNS 6639S-1-103, but it simply has too much friction

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    You could attach a tiny strong magnet to the vane. Arrange a halo of hall effect sensors on the shaft nearby. They're really easy to use, and cheap. If you're pin limited you could multiplex them in groups, otherwise you just need to read which of the detectors is registering a magnet nearby. If you're only after 45 degree resolution you could probably get away with 8. You should select a sensor type which can detect over a relatively wide area, the orientation of some needs to be tightly controlled. This should avoid dead space between the sensors. I see that you don't want to build an enclosure around the detector but you could probably construct this 'dead bug' style in a little over the same volume you would be allocating to a pot.

     

    Charlie

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  • 0

    You could attach a tiny strong magnet to the vane. Arrange a halo of hall effect sensors on the shaft nearby. They're really easy to use, and cheap. If you're pin limited you could multiplex them in groups, otherwise you just need to read which of the detectors is registering a magnet nearby. If you're only after 45 degree resolution you could probably get away with 8. You should select a sensor type which can detect over a relatively wide area, the orientation of some needs to be tightly controlled. This should avoid dead space between the sensors. I see that you don't want to build an enclosure around the detector but you could probably construct this 'dead bug' style in a little over the same volume you would be allocating to a pot.

     

    Charlie

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