Relationship between angle (Stepper motor) and distance (Kinect)?

Hi I am doing a project consisting of a stepper motor and Kinect. I want the stepper motor to rotate according to the distance of a
body joint recognised by Kinect. I wan to cast a laser pointer on the left hand of a person all the time. If the person goes further away from the camera, the stepper motor moves in a way that the laser dot is at the hand.

Kinect will have no knowledge of your external system, you have to develop how that would work. The Kinect Skeleton tracking api's will provide you the joint distances from the sensor in "world space" in meters. Each skeleton object has a position
property that will give you the center of the person(up to 6). If you want to know specific joint detail, you can get full joint information on up to 2. See the skeleton tracking samples in the SDK Toolkit browser(Skeleton Basics, Kinect Explorer, etc)
https://msdn.microsoft.com/en-us/library/hh973074.aspx
Carmine Sirignano - MSFT

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    I want to control a stepper motor with a 6025E National instrument card. My stepper motor is controlled with a microstep controller.
    Does anybody have already done that ? I am interested by some examples...
    Please HELP me...
    Frederic
    [email protected]

    I don't have any examples but I have done this before and it's not that difficult in principle. Getting precise timing can be tricky, and you'll have to use counters rather than the regular DIO ports for that kind of precision.
    I had an MC3479 stepper motor driver to control each motor (there were 2). The way I did it was to use a counter for the clock signal and the DIO ports for control. I generated a gated pulse train on one of the counters, with a DIO pin (DIO 0)as the gate. The Direction, Full/Half step, and other control lines were also connected to the DIO port. I just wrote out whatever data word I needed to setup the motion I wanted, with the pin 0 high to let the clock move the motor. The motor had to be stopped by clearing bit 0, which I had after a tim
    ing delay that was changed in the program. It required a little calculation to get the time delay matched with the frequency of the pulse train to get the number of steps I needed, and it was only approximate; I wasn't worried about exact position as much as being able to adjust the position dynamically.
    For precise position you might try using just a digital line to increment the clock. This is simplest, but the timing will depend on your program. You can also use the other counter for a very precise gate signal, which gives accuracy as well as time-specific rotation, but uses the other counter and is programmatically more complex.

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