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How do I monitor an angle?

Former Member

Hi all,

 

To say that I am new to robotics would be an understatement.  My first "mini project" is putting a camcorder on a turntable-style bearing.  The turntable has (will have) wires fed through the center, so I would like to limit the movement of the turntable to 360 degrees in order to avoid twisting up the wires.  I would also like to be able to find out the exact angle in which the camcorder is pointing so that I can chart the angle in an application.  From the searches I've done, it seems like the right tool is a absolute position encoder.  Am I on the right track?  Can anyone recommend a good product that I could use in conjunction with a turntable?

 

Thanks!

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  • You can buy 360 degree turning potentiometers, or you could use encoders, accelerometers or a simple led/detector and place a grey scale strip of paper around the turntable base.  You set up the scale so that it gives separate values for each degree.  Just about any graphics program will print you a strip to the correct change.  You could also use tic marks on a paper, but you need to have a zero angle point and keep active track of going right or left to keep track of your position.

     

    Basically, you just need to define how much accuracy you need and repeatability you need and then find a solution that works.

     

    Engineering 101.

     

    DAB

  • in reply to DAB

    I agree DAB but I think a Magnetometer may give more long term accuracy than the acelerometer unless the device is moving quite fast .. Mind you Ebay does an entire 10 DOF magnetometer, Gyro,Accelerometer for £10 so I don't think  sensing is a problem here image

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